This standard specifies the mechanical properties of bolts, screws and studs made of austenitic, martensitic and ferritic corrosion resistant stainless steels when tested at an ambient temperature of 15 to 25°C. The properties may be different at higher or lower temperatures. GB/T 3098.6-2000 Mechanical properties of fasteners Stainless steel bolts, screws and studs GB/T3098.6-2000 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Mechanical properties of fastenersBolts, screws and studs made of stainless - steelGB/T3098.6--2000
Approved and issued by: State Administration of Quality and Technical SupervisionDate of issuance: September 26, 2000
Implementation date: February 1, 2001
14-3-1
This standard is equivalent to the international standard ISO3506~1:1997 "Mechanical properties of corrosion resistant stainless steel fasteners Part 1: Bolts, screws and studs".
GB/T3098 has the general title: "Mechanical properties of fasteners", which includes the following parts:
-GB/T 3098.1—2000
Bolts, screws and studs
-—--GB/I 3098.2—-2000
Coarse pitch thread
-GB/T 3098.3-—2000
Set screws
-GB/T 3098.4-2000
Fine pitch thread
Tapping screws
-GB/T 3098.5—2000
-GB/T 3098.6-2000
Stainless steel bolts, screws and studs
GB/T 3098.7--2000
Screws
—GB/T 3098.8—1992
Heat-treatment threaded connection pairs
-GB/T 3098.9--1993
Reinforced rectangular steel hexagonal lock nuts
--GB/T 3098.10—1993
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Bolts, screws, studs and nuts made of non-ferrous metals GB/T 3098.11—1995
Self-drilling and self-tapping screws
GB/T 3098.12—1996
Nut shape guaranteed load test
-GB/T 3098.13—1996
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Torque test and breaking torque of bolts and screws 10mm
-GB/T 3098.14--2000
Nut expansion test
GB/T 3098.15—2000
Stainless steel nuts
GB/T 3098.16—2000
Stainless steel set screws
-GB/T 3098.17—2000
Nominal diameter 1～
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Preload test for hydrogen embrittlement
Parallel bearing surface method
This standard does not adopt Annex 1 of ISO3506--1, and its content has been listed in the referenced standards (Chapter 2).
This standard is one of the revisions of GB/T3098.6—1986, and the main modifications are as follows:
14 -—3 --- 2
a) Only the performance of bolts, screws and studs is specified, and the standard name is also modified accordingly;
b) Stainless steel nuts and set screws are specified by GB/T3098.15 and GB/T3098.16 respectively;
c) Only the mechanical properties tested at an ambient temperature of 15~25 are specified. The performance may be different at higher or lower temperatures (Chapter 1);
d) The minimum thread diameter (1.6mm) is cancelled in the scope of application (Chapter 1);
e) "For high temperature or below zero" is added The corrosion resistance, oxidation resistance and mechanical properties used must be agreed upon by the user and the manufacturer for each specific occasion. "(Chapter 1); f) Add "all austenitic stainless steel fasteners are usually non-magnetic in the annealed state" (Chapter 1); g) Add "A3\, \A5" group and "CI-110" grade and
"Low carbon stainless steel with a carbon content of less than 0.03% can add the mark 'L', such as A4L-80\ (Figure 1);
h) Adjust the content of some elements in the material (Table 1); i) Supplement and adjust the content of martensitic and ferrite steel screws The hardness of bolts, etc. (Table 3);
j) Add the minimum breaking torque of M6M16 austenitic stainless steel bolts and screws (Table 4);
k) Clearly stipulate that the items to be tested for products are determined by the material group and the length of bolts, screws and studs, and add wedge load strength test items for martensitic steel (Article 6.1 and Table 5); 1) Add "If there is a dispute, the Vickers hardness test (HV) shall be the basis for acceptance" for hardness test (Article 6.2.7); m) Add stud marking regulations (Article 3.2.2); n) Add "Packaging mark" and "Surface "Finishing" provisions (Articles 3.2.3 and 3.3);
o) Cancel the elongation in Appendix B of the old standard;
p) Add Appendix B Description of stainless steel categories and groups; q) Cancel Table C1 of Appendix C of the old standard;
I) Add Appendix E Austenitic stainless steel resistant to stress corrosion caused by chlorides, Appendix F Mechanical properties at high temperatures and applicability at low temperatures, Appendix G Austenite, A2 group (18/8 steel) intergranular corrosion time-temperature diagram and Appendix H Magnetism of austenitic stainless steel. This standard replaces GB/T3098 from the date of implementation.6-1986 related parts.
Appendix A of this standard is the appendix of the standard. Appendices B to H of this standard are all indicative appendices. This standard was proposed by the State Bureau of Machinery Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Fasteners. This standard is under the responsibility of the Mechanical Science Research Institute, and the China Aerospace Standardization Institute participated in the drafting.
This standard is under the responsibility of the Secretariat of the National Technical Committee for Standardization of Fasteners ISO
ISO (International Organization for Standardization) is a worldwide joint organization of national standard bodies (ISO member bodies) of various countries. The formulation of international standards is usually carried out through ISO's various technical committees. Each member body can also join the committee if it is interested in the project carried out by a technical committee. Governmental and non-governmental international organizations related to ISC) can also participate in this work. ISO has close ties with the International Electrotechnical Commission (IEC) in the field of electrotechnical standardization. Draft international standards adopted by technical committees are circulated to all member bodies for voting. The formal publication of international standards requires at least 75% of the member bodies to vote in favor.
International standard ISO3506-1 was interpreted by ISO/TC2 Fastener Technical Responsibility.
Committee SC1 Fastener Mechanical Properties Subcommittee developed. This first edition of the standard and ISO3506-2 and ISO35063 have deleted and supplemented
ISO3506:1979, which is a technical revision. The general name of ISO3506 is "Mechanical properties of corrosion-resistant stainless steel fasteners", which includes the following parts:
Part 1: Bolts, screws and studs
-Part 2: Nuts
Part 5: Set screws and similar fasteners not subject to tensile stress
Appendix A of this standard is a standard appendix; Appendix B to Appendix I are informative appendices.
In the formulation of this standard, special attention was paid to fundamentally give the various characteristics of stainless steel fasteners compared with carbon steel and low alloy steel fasteners. Ferritic stainless steel and austenitic stainless steel can only increase strength by cold working, so quenching and tempering cannot be used. These characteristics have been recognized in the development of performance grades and test procedures for mechanical properties. This is different from the measurement of yield strength (yield point) and elongation (total elongation after fracture) for carbon steel and low alloy steel fasteners. 14 -3— 3
1 Scope
This standard specifies the mechanical properties of bolts, screws and studs made of austenitic, martensitic and ferritic corrosion resistant stainless steels when tested at an ambient temperature of 15~-25℃. At higher or lower temperatures, their properties may be different.
This standard applies to bolts, screws and studs: nominal thread diameter d≤39mm;
ordinary thread in accordance with GB/T192;
diameter and pitch combination in accordance with GB/T193; basic dimensions in accordance with GB/T196;
tolerances in accordance with GB/T197;
any shape.
This standard does not apply to fasteners with special performance requirements, such as weldability.
This standard does not specify corrosion and oxidation resistance in special environments, but some information on materials used in special environments is given in Annex E (Informative Annex). For the definition of corrosion and corrosion resistance, see ISO 8044.
The purpose of this standard is to classify the properties of corrosion-resistant stainless steel fasteners. Some materials can be used in air at temperatures of -200 °C and some materials can be used in air at temperatures of +800 °C. Information on the influence of temperature on mechanical properties is given in Annex F (Informative Annex). Corrosion resistance, oxidation resistance and mechanical properties for use at high temperatures or below zero must be agreed between the user and the manufacturer for each specific application. Annex G (Informative Annex) gives information on the influence of carbon content on intergranular corrosion under high temperature conditions. All austenitic stainless steel fasteners are usually non-magnetic in the annealed condition; after cold working, some magnetism may be apparent, see Annex H (Informative Annex).
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T192—1981 Basic tooth profile of common thread GB/T 193--1981
(diameter 1~600mm)
GB/T 1961981
(1 600mm)
GB/T 197--1981
Diameter 1～355mm）
Common thread
Common thread
Common thread
Diameter and pitch series
Basic size (diameter
Tolerance and fit (straight
, metal tensile test method (neq ISO
GB/T 228—1987.
6892:1984)
GB/T 230--1991
Metal Rockwell hardness test method
Metal Brinell hardness test method
GB/T 231-1984
Mechanical properties of fasteners Bolts,
GB/T 3098.1—2000
Screws and studs (idt ISO898-1:1999) 14—3—4
GB/T4340.1—1999 Metal Vickers hardness test Part 1: Test method (eqvISO6507-1:1997) ISO) 683-13:1986 Heat-treated steels, alloy steels and free-cutting steels Part 13: Forgeable stainless steels
ISO 3651-1: 1976
(Revision to be issued)Determination of resistance to intergranular corrosion of stainless steels Part 1: Corrosion test for austenitic and ferritic-austenitic (duplex) stainless steels in nitric acid to measure the mass loss (intergranular corrosion test)
ISO 3651 - 2: 1976
(Revision to be issued)Determination of resistance to intergranular corrosion of stainless steels Part 2: Corrosion of ferritic, austenitic and ferritic-austenitic (duplex) stainless steels in sulphuric acid
ISO 4954 : 1993
Steels for cold heading and extrusion
ISO 8044 : 1988
(Revision to be issued)Corrosion of metals and alloys
Basic terms and definitions
5Stainless steels Part 1: Stainless steels
EN 10088-1: 1995
3Marking, marking and finishing
The marking system for the groups and property grades of stainless steel for bolts, screws and studs is shown in Figure 1. The material marking consists of two parts separated by a dash. Each part marks the group of steel and the second part marks the property grade.
The steel group (part) marking consists of a letter and a number, the letter indicating the type of steel and the number indicating the range of chemical composition of the steel. Among them: A austenitic steel; C--martensitic steel; F-ferritic steel.
The property grade (part 2) marking consists of two numbers and represents 1/10 of the tensile strength of the fastener.
Example:
1) A270 means:
austenitic steel, cold worked, minimum tensile strength 700N/mm2 (700MPa);
2 C4-70 means:
martensitic steel, quenched and tempered, minimum tensile strength 700N/mm2 (700MPa).
3.2 Marking
Only if all the technical requirements of this standard are met, fasteners can be marked and/or marked according to the marking system of clause 3.1. 3.2.1 Bolts and Screws
Hexagonal head bolts and screws with a nominal thread diameter d ≥ 5mm, and hexagon socket or hexalobular socket head screws, shall be clearly marked according to Figures 1 and 2 in clause 3.1. The marking shall include the group and property grade of the steel, as well as the manufacturer's identification mark. Other types of bolts and screws may also comply with this requirement as far as possible and be marked only on the head. Other additional markings are permitted provided that they do not cause confusion.
3.2.2 Studs
Steel categories"
Steel groups 1)
Performance level
Austenite
Cold worked
High strength soft
Hardened
Martensite
Quenched and
Ferrite
Hardened and soft
Figure 1 Marking system for stainless steel groups and performance levels for bolts, screws and studs 1) The classification of steel categories and groups in the figure is explained in Appendix B (suggestive appendix), and the chemical composition is as specified in Table 1. 2) Low carbon stainless steel with a carbon content of less than 0.03% can be marked with "L\, such as A4L-80. KY
Figure 2 Marking of bolts, screws and studs
1-Manufacturer's identification mark; 2-Steel group; 3-Performance grade (a) Marking of hexagonal head bolts and screws: (6) Marking of hexagon socket and hexalobular socket head screws (see 3.2.1 for optional forms); (c) Marking of studs (see 3.2.2 for optional forms) Note: For marking of left-hand threads, see GB/T 3098.1. 60
Cold-worked
14—3— 5
Studs with a nominal thread diameter d ≥ 6 mm shall be clearly marked in accordance with Figures 1 and 2 in 3.1. The marking shall be carried out on the unthreaded shank of the stud. The marking shall include the steel group and performance grade as well as the manufacturer's identification mark. If marking is not possible on the unthreaded shank, it is permitted to mark only the steel group on the nut end of the stud (Figure 2). 3.2.3 Packaging marking
The marking of the manufacturer's trademark or identification mark and the steel group and performance grade on all packages of all specifications is mandatory. 3.3 Surface finishing
Unless otherwise specified, fasteners complying with this standard shall be cleaned and brightened. It is recommended to use a corrosion passivation treatment to maximize corrosion resistance Table 1
Austenite
Martensite
Ferrite
0.09~0.15
0.17~0.25
4 Materials
The stainless steel materials suitable for fasteners produced in accordance with this standard are given in Table 1.
Unless otherwise agreed between the supplier and the purchaser, the chemical composition shall be within the range specified for the steel group and shall be selected by the manufacturer.
Where there is a tendency to intergranular corrosion, it is recommended to test in accordance with ISO36511
or ISO3651-2. In this case, it is recommended to use stable A3 and A5, or A2 and A4 stainless steel with a carbon content not exceeding 0.03%.
Stainless steel groups and chemical composition
Chemical composition
1), %
0.15 0.35
0.15~0.35
16 -19
15 ~20
17 19
12 ~[4
9～12
10～15
1.75 2.25
2),3),4)
7),8)
8),10)
9),10)
2),10)
11),12)
The categories and groups of stainless steel, as well as the description of their characteristics and applications, are given in Appendix B. Examples of stainless steels standardized by ISO 683-13 and ISO 4954 are given in Annex (Indicative Annex) and Annex D (Proposed Annex) respectively. Materials for certain special purposes are given in Annex E.3
1) All values ​​are maximum values ​​except those indicated. 2) Sulfur may be replaced by selenium.
3) If the nickel content is less than 8%, the minimum manganese content must be 5%. 4) When the nickel content is greater than 8%, there is no restriction on the minimum copper content. 5) The molybdenum content may appear in the manufacturer's specifications. However, for certain applications, if it is necessary to limit the molybdenum limit content, it must be indicated by the user in the order.
6) The molybdenum content may appear in the manufacturer's specifications. 7) If the chromium content is less than 17%, the minimum nickel content should be 12%. 8) For austenitic stainless steels with a maximum carbon content of 0.03%, the nitrogen content may reach a maximum of 0.22%. 9) In order to stabilize the organization, the titanium content shall be ≥5×C%～0.8% and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0% and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)bzxZ.net
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For5a3)
2) Yes5a3)
2) Yes1.60
Cold worked
14—3— 5
Studs with a nominal thread diameter d ≥ 6 mm shall be clearly marked according to Figures 1 and 2 in 3.1. Marking shall be carried out on the unthreaded shank of the stud. The marking shall include the steel group and property grade and the manufacturer's identification mark. If marking is not possible on the unthreaded shank, it is permitted to mark only the steel group on the nut end of the stud (Figure 2). 3.2.3 Packaging marking
It is mandatory to mark the manufacturer's trademark or identification mark and the steel group and property grade on all packages of all specifications. 3.3 Surface finishing
Unless otherwise specified, fasteners complying with this standard shall be cleaned and brightened. It is recommended to use corrosion resistance passivation Table 1
Austenite
Martensite
Ferrite
0.09~0.15
0.17~0.25
treatment to maximize the resistance.
4 Materials
The stainless steel materials suitable for fasteners produced according to this standard are given in Table 1.
Unless otherwise agreed between the supplier and the purchaser, the chemical composition shall be within the range specified in the steel group and selected by the manufacturer.
In the case of intergranular corrosion tendency, it is recommended to test according to ISO36511
or ISO3651-2. In this case, it is recommended to use stabilized A3 and A5, or A2 and A4 stainless steels with a carbon content not exceeding 0.03%.
Stainless steel groups and chemical composition
Chemical composition
1), %
0.15 0.35
0.15~0.35
16 -19
15 ~20
17 19
12 ~[4
9～12
10～15
1.75 2.25
2),3),4)
7),8)
8),10)
9),10)
2),10)
11),12)
The categories and groups of stainless steel, as well as the description of their characteristics and applications, are given in Appendix B. Examples of stainless steels standardized by ISO 683-13 and ISO 4954 are given in Annex (Indicative Annex) and Annex D (Proposed Annex) respectively. Materials for certain special purposes are given in Annex E.3
1) All values ​​are maximum values ​​except those indicated. 2) Sulfur may be replaced by selenium.
3) If the nickel content is less than 8%, the minimum manganese content must be 5%. 4) When the nickel content is greater than 8%, there is no restriction on the minimum copper content. 5) The molybdenum content may appear in the manufacturer's specifications. However, for certain applications, if it is necessary to limit the molybdenum limit content, it must be indicated by the user in the order.
6) The molybdenum content may appear in the manufacturer's specifications. 7) If the chromium content is less than 17%, the minimum nickel content should be 12%. 8) For austenitic stainless steels with a maximum carbon content of 0.03%, the nitrogen content may reach a maximum of 0.22%. 9) In order to stabilize the organization, the titanium content shall be ≥5×C%～0.8% and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0% and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For1.60
Cold worked
14—3— 5
Studs with a nominal thread diameter d ≥ 6 mm shall be clearly marked according to Figures 1 and 2 in 3.1. Marking shall be carried out on the unthreaded shank of the stud. The marking shall include the steel group and property grade and the manufacturer's identification mark. If marking is not possible on the unthreaded shank, it is permitted to mark only the steel group on the nut end of the stud (Figure 2). 3.2.3 Packaging marking
It is mandatory to mark the manufacturer's trademark or identification mark and the steel group and property grade on all packages of all specifications. 3.3 Surface finishing
Unless otherwise specified, fasteners complying with this standard shall be cleaned and brightened. It is recommended to use corrosion resistance passivation Table 1
Austenite
Martensite
Ferrite
0.09~0.15
0.17~0.25
treatment to maximize the resistance.
4 Materials
The stainless steel materials suitable for fasteners produced according to this standard are given in Table 1.
Unless otherwise agreed between the supplier and the purchaser, the chemical composition shall be within the range specified in the steel group and selected by the manufacturer.
In the case of intergranular corrosion tendency, it is recommended to test according to ISO36511
or ISO3651-2. In this case, it is recommended to use stabilized A3 and A5, or A2 and A4 stainless steels with a carbon content not exceeding 0.03%.
Stainless steel groups and chemical composition
Chemical composition
1), %
0.15 0.35
0.15~0.35
16 -19
15 ~20
17 19
12 ~[4
9～12
10～15
1.75 2.25
2),3),4)
7),8)
8),10)
9),10)
2),10)
11),12)
The categories and groups of stainless steel, as well as the description of their characteristics and applications, are given in Appendix B. Examples of stainless steels standardized by ISO 683-13 and ISO 4954 are given in Annex (Indicative Annex) and Annex D (Proposed Annex) respectively. Materials for certain special purposes are given in Annex E.3
1) All values ​​are maximum values ​​except those indicated. 2) Sulfur may be replaced by selenium.
3) If the nickel content is less than 8%, the minimum manganese content must be 5%. 4) When the nickel content is greater than 8%, there is no restriction on the minimum copper content. 5) The molybdenum content may appear in the manufacturer's specifications. However, for certain applications, if it is necessary to limit the molybdenum limit content, it must be indicated by the user in the order.
6) The molybdenum content may appear in the manufacturer's specifications. 7) If the chromium content is less than 17%, the minimum nickel content should be 12%. 8) For austenitic stainless steels with a maximum carbon content of 0.03%, the nitrogen content may reach a maximum of 0.22%. 9) In order to stabilize the organization, the titanium content shall be ≥5×C%～0.8% and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0% and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For25
treatment.
4 Materials
The stainless steel materials suitable for fasteners produced according to this standard are given in Table 1.
Unless otherwise agreed between the supplier and the purchaser, the chemical composition shall be within the range specified in the steel group and shall be selected by the manufacturer.
In the case of intergranular corrosion tendency, it is recommended to test according to ISO36511
or ISO3651-2. In this case, it is recommended to use stabilized A3 and A5, or A2 and A4 stainless steels with a carbon content not exceeding 0.03%.
Stainless steel groups and chemical composition
Chemical composition
1), %
0.15 0.35
0.15~0.35
16 -19
15 ~20
17 19
12 ~[4
9～12
10～15
1.75 2.25
2),3),4)
7),8)
8),10)
9),10)
2),10)
11),12)
The categories and groups of stainless steel, as well as the description of their characteristics and applications, are given in Appendix B. Examples of stainless steels standardized by ISO 683-13 and ISO 4954 are given in Annex (Indicative Annex) and Annex D (Proposed Annex) respectively. Materials for certain special purposes are given in Annex E.3
1) All values ​​are maximum values ​​except those indicated. 2) Sulfur may be replaced by selenium.
3) If the nickel content is less than 8%, the minimum manganese content must be 5%. 4) When the nickel content is greater than 8%, there is no restriction on the minimum copper content. 5) The molybdenum content may appear in the manufacturer's specifications. However, for certain applications, if it is necessary to limit the molybdenum limit content, it must be indicated by the user in the order.
6) The molybdenum content may appear in the manufacturer's specifications. 7) If the chromium content is less than 17%, the minimum nickel content should be 12%. 8) For austenitic stainless steels with a maximum carbon content of 0.03%, the nitrogen content may reach a maximum of 0.22%. 9) In order to stabilize the organization, the titanium content shall be ≥5×C%～0.8% and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0% and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For25
treatment.
4 Materials
The stainless steel materials suitable for fasteners produced according to this standard are given in Table 1.
Unless otherwise agreed between the supplier and the purchaser, the chemical composition shall be within the range specified in the steel group and shall be selected by the manufacturer.
In the case of intergranular corrosion tendency, it is recommended to test according to ISO36511
or ISO3651-2. In this case, it is recommended to use stabilized A3 and A5, or A2 and A4 stainless steels with a carbon content not exceeding 0.03%.
Stainless steel groups and chemical composition
Chemical composition
1), %
0.15 0.35
0.15~0.35
16 -19
15 ~20
17 19
12 ~[4
9～12
10～15
1.75 2.25
2),3),4)
7),8)
8),10)
9),10)
2),10)
11),12)
The categories and groups of stainless steel, as well as the description of their characteristics and applications, are given in Appendix B. Examples of stainless steels standardized by ISO 683-13 and ISO 4954 are given in Annex (Indicative Annex) and Annex D (Proposed Annex) respectively. Materials for certain special purposes are given in Annex E.3
1) All values ​​are maximum values ​​except those indicated. 2) Sulfur may be replaced by selenium.
3) If the nickel content is less than 8%, the minimum manganese content must be 5%. 4) When the nickel content is greater than 8%, there is no restriction on the minimum copper content. 5) The molybdenum content may appear in the manufacturer's specifications. However, for certain applications, if it is necessary to limit the molybdenum limit content, it must be indicated by the user in the order.
6) The molybdenum content may appear in the manufacturer's specifications. 7) If the chromium content is less than 17%, the minimum nickel content should be 12%. 8) For austenitic stainless steels with a maximum carbon content of 0.03%, the nitrogen content may reach a maximum of 0.22%. 9) In order to stabilize the organization, the titanium content shall be ≥5×C%～0.8% and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0% and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For8%, and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0%, and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For8%, and shall be appropriately marked according to this table, or the saw and (or) content shall be ≥10×C%～1.0%, and shall be appropriately marked according to this table.
! 0) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be specified in the manufacturer's instructions, but it should not exceed 0.12% for austenitic steels
11) The titanium content may be ≥5×C%～0.8%. 12) The saw content may be ≥10×C%～1.0%. 5 Mechanical properties
The mechanical properties of bolts, screws and studs shall comply with the provisions of Table 2, Table 3 or Table 4.
143— 6
The wedge load strength of bolts and screws made of martensitic steel shall not be less than the minimum tensile strength value specified in Table 3. The mechanical properties specified in this chapter are applicable to acceptance inspection and shall be tested according to the test items specified in Chapter 6. 2
Austenite
A1, A2,
A3, A4
Performance level
Austenitic steel bolts, screws and studs Mechanical properties Tensile strength
Thread diameter
Specified non-proportional elongation stress product.2
1) a, and 0.2 are calculated based on the stress cross-sectional area of ​​the thread [As see Appendix A (Standard Appendix)]. 2) Measure the length of the actual fastener in accordance with the provisions of Article 6.2.4; d-nominal thread diameter,
Elongation after fracture 2
3) For fasteners with a nominal thread diameter d>24mm, the mechanical properties shall be agreed upon by the supply and demand parties, and may be marked according to the group and performance level given in this table. Table 3
Martensitic
Group Property Grade
Ferritic F14
Mechanical Properties of Martensitic and Ferritic Steel Bolts, Screws and StudsTensile Strength.
Specified Non-proportional Elongation Stress. %.2
1) o and .2 are calculated based on the stress cross-sectional area of ​​the thread (As see Appendix A). 2) Measure the actual length of the fastener in accordance with the provisions of 6.2.4; d-3) Quenched and tempered, with a minimum tempering temperature of 275°C. 4) Nominal thread diameter d≤24mm
Nominal thread diameter.
Breaking Torque of Austenitic Steel Bolts and ScrewsBreaking Torque MBmin, N·m
Property Grade
The breaking torque value for martensitic and ferritic steel fasteners shall be agreed upon by the supplier and the buyer.
6.1 Test items
Elongation after fracture 2)
147-209
209-314
228~323
147~209
209~314
128209
171 ~271
M1.6～M16 (coarse thread)
21 ~35
Destructive torque MBminN·m
Performance level
155-220
220~330
350~440
240340
155~220
220~330
135~220
180~285
The test items shall comply with the requirements of Table 5 (determined by the material group and the length of the bolt, screw or stud).
6.2 Test method
6.2.1 General
The error of all length measurements shall not exceed ±0.05mm. 14—3— 7
Tensile strength
1≥2.5d3)
1≥2.5d3)
≥2.5d3)
1≥2.53)
1≥2.5g3)
(≥2.5d3)
1≥2.5d3)
1≥2.5d3)
1≥2.sd3)
Breaking torque
Length of bolt, screw or stud.
Nominal diameter of thread.
~Length of unthreaded shank.
1) For specifications ≥M5.
Test item
Specified non-proportional elongation stress%.2
1=:2.5d3)
t≥:2.5d3)
t≥2.5d3)
1≥:2.5d3)
1≥2.5d3)
(≥2.5a3)
2）For5d3)
(≥2.5a3)
2) pair5d3)
(≥2.5a3)
2) pair
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