GB/T 3098.16-2000 Mechanical properties of fasteners Stainless steel set screws
Some standard content:
GB/T 3098. 16--2000
This standard is equivalent to the international standard ISO3506-3:1997 "Mechanical properties of corrosion-resistant stainless steel fasteners Part 3: Set screws
and similar threaded fasteners not subject to tensile stress". The general title of GB/T3098 is "Mechanical properties of fasteners", which includes the following parts: GB/T3098.1—2000 Mechanical properties of fasteners GB/T3098.2—2000
GB/T 3098.3—2000
GB/T 3098. 4-—2000
-GB/T3098.5—2000
-GB/T 3098. 6--2000
GB/T 3098. 7—2000
GB/T 3098. 8-1992
GB/T 3098. 9—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
GB/T 3098.10--1993
GB/T 3098.11—1995
-GB/T 3098. 12--1996
GB/T 3098.13--1996
-GB/T 3098.14-—2000
-GB/T 3098.15--2000
GB/T 3098.16--2000
Bolts, screws and studs
Nuts coarse thread
Set screws
Nuts fine thread
Self-tapping screws
Stainless steel bolts, screws and studs
Self-extruding screws
Heat-resistant threaded connections
Effective torque steel hexagonal lock nuts
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
1~10 mm
Mechanical properties of fasteners
Mechanical properties of fasteners
Mechanical properties of fasteners
GB/T 3098.17—2000
Mechanical properties of fasteners
Bolts, screws, studs and nuts made of non-ferrous metalsSelf-drilling and tapping screws
Conical proof load test on nuts
Torque test and breaking torque on bolts and screwsNominal diameterExpansion test on nuts
Stainless steel nuts
Stainless steel set screws
Parallel bearing surface method
Preload test for hydrogen embrittlement
Annex F of ISO 3506-3 is not adopted in this standard, the content of which has been listed in the referenced standard (Chapter 2). This standard is one of the revisions of GB/T3098.6-1986. The main changes are as follows: a) Only the performance of set screws is specified, and the standard name is also modified accordingly; b) Stainless steel bolts, screws, studs and nuts are specified by GB/T3098.6 and GB/T3098.15 respectively; c) Only the mechanical properties tested at an ambient temperature of 15-25°C are specified. The properties may be different at higher or lower temperatures (Chapter 1);
d) Add "Corrosion resistance, oxidation resistance and mechanical properties for use at high temperatures or below zero must be agreed upon by the user and the manufacturer for each special occasion. (Chapter 1); e) Add "All austenitic stainless steel fasteners are usually in the annealed state. Non-magnetic; (Chapter 1); f) Add "A3" and "A5" groups and low-carbon stainless steel with a carbon content of less than 0.03%, and the mark "L" can be added, such as A4L-21H" (Figure 1);
g) Adjust the content of some elements in the material (Table 1); h) Comprehensively specify the guaranteed torque (Table 3) and test methods (Article 6.1) of various hexagon socket set screws; i) Add "If there is a dispute, the Vickers hardness test (HV) shall be used as the basis for acceptance (Article 6.2) to the hardness test; i) Add the provisions of "Packaging Label" and "Surface Finishing" (Articles 3.2.2 and 3.3); k) Add Appendix A to explain the categories and groups of stainless steel; 1) Cancel Table C1 of Appendix C of the old standard;
GB/T 3098.16--2000
Austenite, A2 group (18/8 steel) intergranular corrosion and Appendix Em) Add Appendix D
This standard replaces the relevant parts of GB/T3098.6--1986 from the date of implementation. Appendices A to E of this standard are all suggestive appendices. This standard was proposed by the State Machinery Industry Bureau. Magnetism of austenitic stainless steel
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 interpreted by the Secretariat of the National Technical Committee for Standardization of Fasteners. 199
GB/T3098.16—2000
ISOForeword
ISO (International Organization for Standardization) is a worldwide federation of national standard bodies (ISO member bodies) of various countries. United Nations Organization. The development of international standards is usually carried out through ISO's various technical committees. Each member group can also participate in the committee if it is interested in the project carried out by a technical committee. International organizations, governmental and non-governmental, related to ISO can also participate in this work. ISO has close ties with the International Electrotechnical Commission (IEC) in the field of electrotechnical standardization. The draft international standards adopted by the technical committees are distributed to all member groups for voting. The formal publication of international standards requires at least 75% of the member groups to vote in favor.
International Standard ISO3506-3 was developed by ISO/TC2 Fastener Technical Committee SC1 Fastener Mechanical Properties Subcommittee. This standard, the 1st edition, has deleted and supplemented ISO3506:1979 with ISO3506-1 and ISO3506-2, and 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 to Appendix F of this standard are prompt appendices. ISO Introduction
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 formulation of performance grades and test procedures for mechanical properties. 200
1 Model Figure
National Standard of the People's Republic of China
Mechanical properties of fasteners-Set screws made of stainless-steelGB/T 3098. 16--2000
idtISo3506-3:1997
Replaces GB/T 3098. 6--1986
Relevant parts
This standard specifies the mechanical properties of set screws and similar fasteners not subject to tensile stress when made of austenitic, martensitic and ferritic corrosion-resistant stainless steel and tested at an ambient temperature of 15~25℃. At higher or lower temperatures, their properties may be different. This standard applies to set screws and similar fasteners not subject to tensile stress: nominal thread diameter d=1.6~24mm;
Ordinary thread in accordance with GB/T192;
Combination of diameter and pitch in accordance with GB/T193; Basic size in accordance with GB/T196;
Tolerance 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 resistance and oxidation resistance under special environments. The purpose of this standard is to classify the performance of corrosion-resistant stainless steel fasteners. The corrosion resistance and oxidation resistance and mechanical properties for use at high temperatures or below zero must be agreed upon by the user and the manufacturer for each special occasion. Appendix D (suggestive Appendix) gives the intergranular corrosion tendency determined by the carbon content under high temperature conditions. All austenitic stainless steel fasteners are usually non-magnetic in the annealed state; after cold working, some magnetism may be obvious, see Appendix E (suggestive Appendix).
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 released, 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. Basic tooth profile of common thread
GB/T 192—1981
GB/T193--1981 Diameter and pitch series of common thread (diameter 1~600mm)GB/T 196—1981
GB/T 197--1981
Basic size (diameter 1~600mm)
Common thread
Tolerance and fit (diameter 1～355mm)
Common thread
7Metal tensile test method
GB/T 228---1987
GB/T230—1991Metal Rockwell hardness test methodMetal Brinell hardness test method
GB/T 231—1984
GB/T30983—2000Mechanical properties of fastenersSet screws (idtISO898-5:1998)GB/T.4340.1-1999Metal Vickers hardness testPart 1:Test method (eqvISO6507-1:1997)Approved by the State Administration of Quality and Technical Supervision on September 26, 2000Implementation on February 1, 2001
GB/T3098.162000
ISO683-13:1986Heat-treatable steel, alloy steel and free-cutting steelPart 13:Forgeable stainless steelISO3651-1 :1976 (to be revised) Determination of intergranular corrosion resistance of stainless steels Part 1: Corrosion test for mass loss of austenitic and ferritic-austenitic (duplex) stainless steels in nitric acid (intergranular corrosion test) ISO3651-2:1976 (to be revised) Determination of intergranular corrosion resistance of stainless steels Part 2: Corrosion test for ferritic, austenitic and ferritic-austenitic (duplex) stainless steels in sulfuric acid ISO4954:1993 Steels for cold heading and cold extrusion 3 Marking, marking and surface finishing
3.1 Marking
The marking system for stainless steel groups and property grades for set screws is shown in Figure 1. The material marking consists of two parts separated by a dash. The first part marks the steel group and the second part marks the property grade. The steel group (part 1) marking consists of a letter and a number, the letter indicates the type of steel, and the number indicates the chemical composition range of the steel. Among them: A-austenitic steel.
The property grade (part 2) is marked with two digits indicating the minimum Vickers hardness of 1/10 and the letter H indicating the hardness, see Table 1.
Property grade
Vickers hardness HVmin
Example:
1) A1-12H indicates:
Table 1 Marking of property grades in Vickers hardness 12H
Austenitic steel, soft, minimum hardness 125HV. Steel category,
Steel group 1
Property grade
Austenitic
Cold worked
1) The classification of the steel category and group in the figure is explained in Appendix A (indicative appendix), and the chemical composition is specified in Table 2. 2) Low carbon stainless steel with a carbon content of less than 0.03% can be marked with "*L", such as A4L-21H. Figure 1 Marking system for stainless steel groups and performance grades of set screws 3.2 Marking
3.2.1 Set screws
The marking of set screws is not mandatory. 21H
Only when all technical requirements of this standard are met can fasteners be marked and (or) marked according to the marking system of Article 3.1. 202
3.2.2 Packaging marking
GB/T 3098.16—2000
On all packages of all specifications, it is mandatory to mark the manufacturer's trademark or identification mark and the steel group and performance grade. 3.3 Surface finish
Unless otherwise specified, fasteners that comply with this standard should be cleaned and brightened. It is recommended to use passivation treatment to maximize corrosion resistance.
4 Materials
The stainless steel materials suitable for fasteners produced in accordance with this standard are given in Table 2. Unless otherwise agreed between the supplier and the buyer, the chemical composition should be within the range specified for the steel group and selected by the manufacturer. In situations where there is a tendency for intergranular corrosion, it is recommended to test in accordance with ISO3651-1 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%. Table 2 Stainless steel groups and chemical composition
[Group
Austenitic A3
Chemical composition\, %
0.15~0.35
15~~20
2~~3
1 The categories and groups of stainless steel, as well as the description of their characteristics and applications, are given in Appendix A. Ni
10~15
2), 3).4)
6), 7)
7), 9)
8), 9)
2 Has been specified by ISO 683-13 and 1SO 4954 Examples of standardized stainless steel are given in Appendix B (indicative appendix) and Appendix C (indicative appendix).
1) All values are maximum values except those indicated. 2) Sulfur can 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 content of the steel. 5) The molybdenum content may appear in the manufacturer's instructions. For some applications, if it is necessary to limit the limit content of molybdenum, it must be indicated by the user in the order.
6) If the chromium content is less than 17%, the minimum content of the inlay shall be 12%. 7) For austenitic stainless steel with a maximum carbon content of 0.03%, the nitrogen content may be up to 0.22%. 8) In order to stabilize the structure, 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.
9) For products with larger diameters, in order to achieve the specified mechanical properties, a higher carbon content may be indicated in the manufacturer's instructions, but it shall not exceed 0.12%. Mechanical properties
The mechanical properties of set screws produced in accordance with this standard shall comply with the provisions of Tables 3 and 4. The mechanical properties specified in 5.1 and 5.2 are applicable to acceptance inspection and shall be tested in accordance with the provisions of 6.1 and 6.2 respectively. 5.1 Proof torque of hexagon socket set screws
The hexagon socket set screws shall comply with the proof torque requirements specified in Table 3. 203
Nominal thread diameter
GB/T3098.16--2000
Table 3 Guaranteed torque
Minimum length of set screw test piece\,mm
Cylindrical end
1) The minimum length of the test piece is the length below the dotted line of the step in the product standard. 5.2
The hardness of the set screw shall comply with the requirements of Table 4. Table 4 Hardness
Test method
Vickers hardness HV
Brinell hardness HB
Rockwell hardness HRB
6 Test method
6.1 Guaranteed torque test for hexagon socket set screws 12H
125209
123~213
Performance level
Guaranteed torque.N·m
Performance level
210min
214min
Screw the set screw into the test fixture, as shown in Figure 2, until the screw surface is flush with the test fixture and should be on the supporting end on the base. Hexagon socket wrench for the test: The tolerance of the width across flats is h9, and the minimum value of the diagonal width should be 1.13min, hardness of 50~55HRC, and should be fully engaged with the hexagon socket of the set screw. The screw should be able to withstand the guaranteed torque specified in Table 3 without breaking, cracking or thread stripping.
Note: Damage to the groove caused by the torque test shall not be used as a basis for rejection. 204
GB/T3098.16—2000
1--Torque wrench; 2-Test screw; 3--Test fixture: hardness ≥50HRC internal thread tolerance 5H; 4--Support screw: hardness 450~570HV
Figure 2 Torque test device
6.2 Hardness HB, HRB or HV test of set screws The hardness test shall be carried out in accordance with the provisions of GB/T231 (HB), GB/T230 (HRB) or GB/T4340.1 (HV). In case of dispute, the Vickers hardness test (HV) shall be the basis for acceptance (Table 4). The test procedure shall be in accordance with GB/T3098.3. 205
A7 General
GB/T 3098.16—2000
Appendix A
(Indicative Appendix)
Description of stainless steel categories and groups
The steels used in GB/T3098.6, GB/T3098.15 and GB/T3098.16 involve the following steels: Austenitic steel: A1~A5
Martensitic steel: C1~C4
Ferritic steel: F1
This appendix describes the properties of the above steels and also gives some information on non-standardized FA group steels. This type of steel has a martensite-austenite structure. A2A steel (austenite structure)
Five basic groups A1 to A5 are specified in GB/T3098.6. GB/T3098.15 and GB/T3098.16. They cannot be quenched and are usually non-magnetic. In order to reduce the sensitivity to work hardening, copper components can be added to A1 to A5 steels, as specified in Table 1. For metastable A2 and A4 group steels, the following applies: Chromium oxide can improve the corrosion resistance of steel, and low carbon content is extremely important for metastable steels. Because chromium has a high affinity for carbon, chromium carbide can replace chromium oxide that is more easily generated at high temperatures (Appendix D). For stable A3 and A5 group steels, the following applies: Ti, Nb or Ta elements affect the presence of carbon, causing chromium oxide to reach its maximum content. For marine or similar use environments, the Cr and Ni contents are required to be about 20% each, and the Mo content is 4.5% to 6.5%. When there is a high tendency to corrosion, experts should be consulted. A2.1A1 steels
A1 steels are specially designed for machining. They have a high sulfur content and therefore have a lower corrosion resistance than steels with a standard sulfur content.
A2.2A2 steels
A2 steels are the most widely used stainless steels and are used in kitchen equipment and chemical plants. They are not suitable for non-oxidizing acids and media with chlorine, such as swimming pools and seawater.
A2.3A3 steels
A3 steels are stable "stainless steels" with the same properties as A2 steels. A2.4A4 steels
A4 steels are "acid-resistant steels" containing the element Mo, which provide fairly good corrosion resistance. A4 is usually used in the chemical fiber industry. This group of steels was developed for boiling sulfuric acid (hence the name "acid-resistant") and is also suitable to a certain extent for chloride-containing applications. A4 is also commonly used in the food industry and shipbuilding industry.
A2.5A5 steel group
A5 steel group is a stable "acid-resistant steel" with the same performance as A4 steel group. A3F steel (ferrite structure)
F1 steel group is used in GB/T3098.6 and GB/T3098.15. F1 steel group is usually not hard, and should not be quenched even if it is possible in some cases. F1 steel group is magnetic. A3.1 F1 steel group
GB/T 3098. 16-2000
F1 steel group is usually used for simpler devices. The device should avoid ultra-pure ferrite with very low C and N content. If necessary, F1 steel group can replace A2 steel and A3 steel group. Usually with a higher chromium content A4C steel (martensitic structure)
C1, C3 and C4 three groups of martensitic steel are used in GB/T3098.6 and GB/T3098.15. They can be tempered to extremely high strength and are magnetic.
A4.1C1 steel
C1 steel has limited corrosion resistance and is used for turbines, pumps and knives. A4.2C3 steel
C3 steel has better corrosion resistance than C1 steel, but it is still limited and is used for pumps and valves. A4.3C4 steel
C4 steel has limited corrosion resistance and is used for machining materials. Other aspects are similar to C1 steel. A5FA steel (ferrite-austenite structure)FA steel has not been adopted in GB/T3098.6.GB/T3098.15 and GB/T3098.16, but it is very likely to be adopted in the future. This type of steel is the so-called dual-phase steel. The originally developed FA steel has some defects, which have been overcome in the recently developed steel. FA steel has better properties than A4 and A5 steel, especially strength, and it also has excellent resistance to pitting and crevice corrosion. Composition examples are given in Table A1.
Ferrite-austenite
Ferrite-austenite steel
—Chemical composition
Chemical composition, %
GB/T3098.16—2000
1080>%
0800%×s
1s81~s01
1$*81~9\91
0'61~0°21
81~g91
s~s'll
0*1~0'11 p1≥0%×0
9*81~9'91
92~0'29\81~5'91
061~021
(00t ~08
21~0'b1>%×0
0'61~0z1
0'61~021
061~021||tt| |(9861889
1st0'00'z
xeuoso0
xe0800
080℃
G B/T3098.16—2000
0*61~0-21
00%~00gmg
22'0~210'N||tt| |080>0%XS*1
08°0>0%×*S!L
s01~s'8
s'~'
02~0'6|| tt||061~021
001~0°8
o11~0'8
01~0'6
*81~*91||tt ||981~591
581~991
s81s*91
0'61~0'21
0'21~0'91| |tt||0'61~021
0°61~021
061~0:21
0'61~021
oosro016—-2000
Appendix A
(Indicative Appendix)
Description of stainless steel categories and groups
The steels used in GB/T3098.6, GB/T3098.15 and GB/T3098.16 involve the following steels;Austenitic steels: A1~A5
Martensitic steels: C1~C4
Ferritic steels: F1
This appendix describes the properties of the above steels and also gives some information on non-standardized FA group steels. This type of steel has a martensite-austenite structure. A2A steel (austenite structure)
Five basic groups A1~A5 are specified in GB/T3098.6, GB/T3098.15 and GB/T3098.16. They cannot be quenched and are usually non-magnetic. To reduce the sensitivity to work hardening, copper may be added to A1 to A5 steels as specified in Table 1. For metastable A2 and A4 steels, the following applies: Chromium oxide improves the corrosion resistance of steels. Low carbon content is extremely important for metastable steels. Because chromium has a high affinity for carbon, chromium carbides can replace chromium oxide, which is more easily formed at high temperatures (Annex D). For stable A3 and A5 steels, the following applies: Ti, Nb or Ta elements affect the presence of carbon, resulting in chromium oxide reaching its maximum content. For marine or similar use environments, Cr and Ni contents of about 20% each and Mo content of 4.5% to 6.5% are required. When there is a high tendency to corrosion, experts should be consulted. A2.1 A1 steels
A1 steels are specially designed for machining. This group of steels has a high sulfur content and therefore has a lower corrosion resistance than steels with corresponding standard sulfur content.
A2.2A2 steel group
A2 steel group is the most widely used stainless steel, used in kitchen equipment and chemical plants. This group of steel is not suitable for non-oxidizing acids and media with chlorine components, such as swimming pools and seawater.
A2.3A3 steel group
A3 steel group is a stable "stainless steel" with the same properties as A2 steel group. A2.4A4 steel group
A4 steel group is an "acid-resistant steel" containing Mo, which can provide quite good corrosion resistance. A4 is usually used in the chemical fiber industry. This group of steel was developed for boiling sulfuric acid (hence the name "acid-resistant") and is also suitable to a certain extent for chloride-containing occasions. A4 is also commonly used in the food industry and shipbuilding industry.
A2.5A5 steel group
A5 steel group is a stable "acid-resistant steel" with the same properties as A4. A3F steel (ferrite structure)
F1 group ferritic steel is adopted in GB/T3098.6 and GB/T3098.15. F1 group steel cannot be hardened normally and should not be quenched even if it is possible in some cases. F1 group steel is magnetic. A3.1 F1 group steel
GB/T 3098. 16-2000
F1 group steel is usually used for simpler devices. The device should avoid ultra-pure ferrite with very low C and N content. If necessary, F1 group steel can replace A2 group steel and A3 group steel. A4C steel (martensitic structure) usually with higher chromium content
C1, C3 and C4 three groups of martensitic steel are adopted in GB/T3098.6 and GB/T3098.15. They can be quenched to extremely high strength and are magnetic.
A4.1C1 steel group
C1 steel group has limited corrosion resistance and is used for turbines, pumps and knives. A4.2C3 steel group
C3 steel group has better corrosion resistance than C1 steel, but it is still limited and is used for pumps and valves. A4.3C4 steel group
C4 steel group has limited corrosion resistance and is used for machining materials. Other aspects are similar to C1 steel group. A5FA steel (ferrite-austenite structure)FA steel has not yet been adopted in GB/T3098.6.GB/T3098.15 and GB/T3098.16, but it is very likely to be adopted in the future. This type of steel is the so-called dual-phase steel. The originally developed FA steel has some defects, which have been overcome in the recently developed steel. FA steel has better properties than A4 and A5 steels, especially strength, and it also has excellent resistance to pitting and crevice corrosion. Composition examples are given in Table A1.
Ferrite-austenite
Ferrite-austenite steel
—Chemical composition
Chemical composition, %
GB/T3098.16—2000
1080>%
0800%×s
1s81~s01
1$*81~9\91
0'61~0°21
81~g91
s~s'll
0*1~0'11 p1≥0%×0
9*81~9'91
92~0'29\81~5'91
061~021
(00t ~08
21~0'b1>%×0
0'61~0z1
0'61~021
061~021||tt| |(9861889
1st0'00'z
xeuoso0
xe0800
080℃
G B/T3098.16—2000
0*61~0-21
00%~00gmg
22'0~210'N||tt| |080>0%XS*1
08°0>0%×*S!L
s01~s'8
s'~'
02~0'6|| tt||061~021
001~0°8
o11~0'8
01~0'6
*81~*91||tt ||981~591
581~991
s81s*91
0'61~0'21
0'21~0'91| |tt||0'61~021
0°61~021
061~0:21
0'61~021
oosro016—-2000
Appendix A
(Indicative Appendix)
Description of stainless steel categories and groups
The steels used in GB/T3098.6, GB/T3098.15 and GB/T3098.16 involve the following steels;Austenitic steels: A1~A5
Martensitic steels: C1~C4
Ferritic steels: F1
This appendix describes the properties of the above steels and also gives some information on non-standardized FA group steels. This type of steel has a martensite-austenite structure. A2A steel (austenite structure)
Five basic groups A1~A5 are specified in GB/T3098.6, GB/T3098.15 and GB/T3098.16. They cannot be quenched and are usually non-magnetic. To reduce the sensitivity to work hardening, copper may be added to A1 to A5 steels as specified in Table 1. For metastable A2 and A4 steels, the following applies: Chromium oxide improves the corrosion resistance of steels. Low carbon content is extremely important for metastable steels. Because chromium has a high affinity for carbon, chromium carbides can replace chromium oxide, which is more easily formed at high temperatures (Annex D). For stable A3 and A5 steels, the following applies: Ti, Nb or Ta elements affect the presence of carbon, resulting in chromium oxide reaching its maximum content. For marine or similar use environments, Cr and Ni contents of about 20% each and Mo content of 4.5% to 6.5% are required. When there is a high tendency to corrosion, experts should be consulted. A2.1 A1 steels
A1 steels are specially designed for machining. This group of steels has a high sulfur content and therefore has a lower corrosion resistance than steels with corresponding standard sulfur content.
A2.2A2 steel group
A2 steel group is the most widely used stainless steel, used in kitchen equipment and chemical plants. This group of steel is not suitable for non-oxidizing acids and media with chlorine components, such as swimming pools and seawater.
A2.3A3 steel group
A3 steel group is a stable "stainless steel" with the same properties as A2 steel group. A2.4A4 steel group
A4 steel group is an "acid-resistant steel" containing Mo, which can provide quite good corrosion resistance. A4 is usually used in the chemical fiber industry. This group of steel was developed for boiling sulfuric acid (hence the name "acid-resistant") and is also suitable to a certain extent for chloride-containing occasions. A4 is also commonly used in the food industry and shipbuilding industry.
A2.5A5 steel group
A5 steel group is a stable "acid-resistant steel" with the same properties as A4. A3F steel (ferrite structure)
F1 group ferritic steel is adopted in GB/T3098.6 and GB/T3098.15. F1 group steel cannot be hardened normally and should not be quenched even if it is possible in some cases. F1 group steel is magnetic. A3.1 F1 group steel
GB/T 3098. 16-2000
F1 group steel is usually used for simpler devices. The device should avoid ultra-pure ferrite with very low C and N content. If necessary, F1 group steel can replace A2 group steel and A3 group steel. A4C steel (martensitic structure) usually with higher chromium content
C1, C3 and C4 three groups of martensitic steel are adopted in GB/T3098.6 and GB/T3098.15. They can be quenched to extremely high strength and are magnetic.
A4.1C1 steel group
C1 steel group has limited corrosion resistance and is used for turbines, pumps and knives. A4.2C3 steel group
C3 steel group has better corrosion resistance than C1 steel, but it is still limited and is used for pumps and valves. A4.3C4 steel group
C4 steel group has limited corrosion resistance and is used for machining materials. Other aspects are similar to C1 steel group. A5FA steel (ferrite-austenite structure)FA steel has not yet been adopted in GB/T3098.6.GB/T3098.15 and GB/T3098.16, but it is very likely to be adopted in the future. This type of steel is the so-called dual-phase steel. The originally developed FA steel has some defects, which have been overcome in the recently developed steel. FA steel has better properties than A4 and A5 steels, especially strength, and it also has excellent resistance to pitting and crevice corrosion. Composition examples are given in Table A1.
Ferrite-austenite
Ferrite-austenite steel
—Chemical composition
Chemical composition, %
GB/T3098.16—2000
1080>%
0800%×s
1s81~s01
1$*81~9\91
0'61~0°21
81~g91
s~s'll
0*1~0'11 p1≥0%×0
9*81~9'91
92~0'29\81~5'91
061~021
(00t ~08
21~0'b1>%×0
0'61~0z1
0'61~021
061~021||tt| |(9861889
1st0'00'z
xeuoso0
xe0800
080℃
G B/T3098.16—2000
0*61~0-21
00%~00gmg
22'0~210'N||tt| |080>0%XS*1
08°0>0%×*S!L
s01~s'8
s'~'
02~0'6|| tt||061~021
001~0°8
o11~0'8
01~0'6
*81~*91||tt ||981~591
581~991
s81s*91
0'61~0'21
0'21~0'91| |tt||0'61~021
0°61~021
061~0:21
0'61~021
oosro04A4 steel group
A4 steel group is "acid-resistant steel" and contains Mo element, which can provide quite good corrosion resistance. A4 is usually used in chemical fiber industry. This group of steel was developed for boiling sulfuric acid (hence the name "acid-resistant") and is also suitable for chloride-containing occasions to a certain extent. A4 is also commonly used in food industry and shipbuilding industry.
A2.5A5 steel group
A5 steel group is a stable "acid-resistant steel" with the same performance as A4 group. A3F steel (ferritic structure)
F1 group ferritic steel is adopted in GB/T3098.6 and GB/T3098.15. F1 steel group cannot be hardened normally and should not be quenched even if it is possible in some cases. F1 steel group is magnetic. A3.1 F1 steel group
GB/T 3098. 16-2000
F1 steel group is usually used for simpler devices. The device should avoid ultra-pure ferrite with very low C and N content. If necessary, F1 group steel can replace A2 group steel and A3 group steel. Usually with higher chromium content A4C type steel (martensitic structure)
C1, C3 and C4 three groups of martensitic steel are adopted in GB/T3098.6 and GB/T3098.15. They can be quenched to extremely high strength and are magnetic.
A4.1C1 group steel
C1 group steel has limited corrosion resistance and is used for turbines, pumps and knives. A4.2C3 group steel
C3 group steel has better corrosion resistance than C1 steel, but it is still limited and is used for pumps and valves. A4.3C4 group steel
C4 group steel has limited corrosion resistance and is used for machining materials. Other aspects are similar to C1 group steel. A5FA steel (ferrite-austenite structure)FA steel has not been adopted in GB/T3098.6.GB/T3098.15 and GB/T3098.16, but it is very likely to be adopted in the future. This type of steel is the so-called dual-phase steel. The originally developed FA steel has some defects, which have been overcome in the recently developed steel. FA steel has better properties than A4 and A5 steel, especially strength, and it also has excellent resistance to pitting and crevice corrosion. Composition examples are given in Table A1.
Ferrite-austenite
Ferrite-austenite steel
—Chemical composition
Chemical composition, %
GB/T3098.16—2000
1080>%
0800%×s
1s81~s01
1$*81~9\91
0'61~0°21
81~g91
s~s'll
0*1~0'11 p1≥0%×0
9*81~9'91
92~0'29\81~5'91
061~021
(00t ~08
21~0'b1>%×0
0'61~0z1
0'61~021
061~021||tt| |(9861889
1st0'00'z
xeuoso0
xe0800
080℃
G B/T3098.16—2000
0*61~0-21
00%~00gmg
22'0~210'N||tt| |080>0%XS*1
08°0>0%×*S!L
s01~s'8
s'~'
02~0'6|| tt||061~021
001~0°8
o11~0'8
01~0'6
*81~*91||tt ||981~591
581~991
s81s*91
0'61~0'21
0'21~0'91| |tt||0'61~021
0°61~021www.bzxz.net
061~0:21
0'61~021
oosro04A4 steel group
A4 steel group is "acid-resistant steel" and contains Mo element, which can provide quite good corrosion resistance. A4 is usually used in chemical fiber industry. This group of steel was developed for boiling sulfuric acid (hence the name "acid-resistant") and is also suitable for chloride-containing occasions to a certain extent. A4 is also commonly used in food industry and shipbuilding industry.
A2.5A5 steel group
A5 steel group is a stable "acid-resistant steel" with the same performance as A4 group. A3F steel (ferritic structure)
F1 group ferritic steel is adopted in GB/T3098.6 and GB/T3098.15. F1 steel group cannot be hardened normally and should not be quenched even if it is possible in some cases. F1 steel group is magnetic. A3.1 F1 steel group
GB/T 3098. 16-2000
F1 steel group is usually used for simpler devices. The device should avoid ultra-pure ferrite with very low C and N content. If necessary, F1 group steel can replace A2 group steel and A3 group steel. Usually with higher chromium content A4C type steel (martensitic structure)
C1, C3 and C4 three groups of martensitic steel are adopted in GB/T3098.6 and GB/T3098.15. They can be quenched to extremely high strength and are magnetic.
A4.1C1 group steel
C1 group steel has limited corrosion resistance and is used for turbines, pumps and knives. A4.2C3 group steel
C3 group steel has better corrosion resistance than C1 steel, but it is still limited and is used for pumps and valves. A4.3C4 group steel
C4 group steel has limited corrosion resistance and is used for machining materials. Other aspects are similar to C1 group steel. A5FA steel (ferrite-austenite structure)FA steel has not been adopted in GB/T3098.6.GB/T3098.15 and GB/T3098.16, but it is very likely to be adopted in the future. This type of steel is the so-called dual-phase steel. The originally developed FA steel has some defects, which have been overcome in the recently developed steel. FA steel has better properties than A4 and A5 steel, especially strength, and it also has excellent resistance to pitting and crevice corrosion. Composition examples are given in Table A1.
Ferrite-austenite
Ferrite-austenite steel
—Chemical composition
Chemical composition, %
GB/T3098.16—2000
1080>%
0800%×s
1s81~s01
1$*81~9\91
0'61~0°21
81~g91
s~s'll
0*1~0'11 p1≥0%×0
9*81~9'91
92~0'29\81~5'91
061~021
(00t ~08
21~0'b1>%×0
0'61~0z1
0'61~021
061~021||tt| |(9861889
1st0'00'z
xeuoso0
xe0800
080℃
G B/T3098.16—2000
0*61~0-21
00%~00gmg
22'0~210'N||tt| |080>0%XS*1
08°0>0%×*S!L
s01~s'8
s'~'
02~0'6|| tt||061~021
001~0°8
o11~0'8
01~0'6
*81~*91||tt ||981~591
581~991
s81s*91
0'61~0'21
0'21~0'91| |tt||0'61~021
0°61~021
061~0:21
0'61~021
oosro021
0'61～021
oosro021
0'61～021
oosro0
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