Some standard content:
Fasteners for steel pipe flanges
(American system)
HG 2063497www.bzxz.net
Subject content and scope of application
This standard specifies the types, specifications, technical requirements and use regulations of fasteners for steel pipe flanges (America system). This standard applies to fasteners for steel pipe flanges (hexagonal head bolts, equal-length studs, full-thread studs and nuts), 483
GB 196
GB 197
GB 901
GB1220
GB3077
GB 3098.2
GB 3098. 6
GB5782
GB 6170
JB4730
Reference standards
《Fastener external thread parts end》
《Fastener acceptance inspection, marking and packaging》《Common thread basic dimensions》
《Common thread tolerance and fit》
&Equal length studs - Grade B》
Purple stainless steel bars》
《Alloy structural steel technical conditions》
&Fastener mechanical properties screw Bolts, screws and studs" "Mechanical properties of fasteners and nuts"
Mechanical properties of fasteners Stainless steel bolts, screws, studs and nuts "Hexagonal head bolts - Grade A and B"
Type I hexagonal nuts - Grade A and B"
"Non-destructive testing of pressure vessels"
Types, specifications, dimensions
Types of fasteners include hexagonal head bolts, equal-length studs, full-thread studs, type 1 angle nuts and pipe flanges. 0. 1
nut.
3.0.2 Hexagonal head bolts
The type and size of hexagonal head bolts for pipe flanges shall comply with the requirements of GB5782, as shown in Figure 3.0.2, and the end of the bolt shall be chamfered.
3.0.2 Hexagonal head end bolts
2The specifications and performance grades of hexagonal head bolts are shown in Table 3.0.2. 3.0,2 Specifications and performance grades of hexagonal head bolts are in accordance with GB5782—A and B grades
Equal length studs,
M14, M16, M20, M24, M27, M30.M33 performance grades (commercial grade)
8. 8.A2-50, A2-70
1. The type and size of equal-length studs for pipe flanges shall comply with the requirements of GH901, but the two ends of the studs shall adopt balanced angle ends, as shown in Figure 3.0.3. The studs with thread specifications of M36×3, M39×3, M42×3, M45×3, M48X3.M52×3, M56×3, M64X3, M70×3, M76X3, M82×3, and M90X3 shall adopt fine buds, thread size and public chips: shall comply with GB196 and GB197, the end of the stud shall comply with the requirements of GB2 chamfered end, and the rest shall comply with the requirements of GB901, Figure 3. 3
Equal-length double-headed battle row
2 The specifications and material grades of equal-length studs are shown in Table 3.0.3. Table 3.0.3 Specifications and material grades of equal length studs
Effective studs
HG 20634
M14, M16, M20.M24, M27.M30.M32, M36X3, M39X3.M42X3, M45X3., M4BX3, M52X3.M56X3, M64X3, M70X3, M76X3, M82X3, M90X 33.0.4 Fully threaded studs
Material grade
(special grade)
35CrMoA, 25Cr2MoYA
OCrIBNi9, (C-17Ni12Mo2
1 The types and sizes of fully threaded studs for pipe flanges are shown in Figure 3.0.4. The thread dimensions and tolerances shall comply with GB196 and GB 197. The ends of the studs shall comply with the requirements of GB 2 chamfered ends, and the rest shall comply with the requirements of GB 901. 3.0.4 Fully threaded studs
2 The specifications and material grades of fully threaded studs are shown in Table 3.0.4. Table 3.0.4 Specifications and material grades of fully threaded studs Standards
Fully threaded studs
HG20634
3.0.5 Nuts
M14.M16.M20.M24.M27.M30.M33,M36X3.M39X3.M42 X3.M45×3, M48X3.M52X3.M56×3.M64X3, M70X3.M76X3M82X3.M90X3 Material brand (special grade)
35CrMoA, 25Cr2MoVA
GCr18Nis, OCr17Ni12Ma2
1 The type and size of nuts used with hexagonal bolts shall comply with GB 6170 requirements, as shown in Figure 3.0.5-1. When used with studs and full-thread studs, the size of the nut shall comply with the requirements of Figure 3.0.52 and Table 3.0.5-1. Other requirements shall comply with the requirements of CB 6170, Figure 3.0.5-1 Nut
90°～120°
m'imin
15~30g
Figure 3.0.5-2
Table 3.3- 5-1
Special nut for flange
Special nut size table for general flange
M36×3M39×3M42×3
M45X3M48X3M52X5M56X3M64X3M70X356.2
M76X3M82X3M90X3
The specifications and performance grade (commercial grade) and material brand (special grade) of nuts are shown in Table 3.0.5-2. Table 3.0.5-2 Specifications and performance grade of nuts, material brand and push number
GB 6170-A grade and
Special nut for pipe flange
(HG 206343
M14.M16.M20,M24.M27,M30,M33
M14.M16.M20.M24.M27.M30.M33.M36×3, M39×3.M42X3, M45X3
M18×3, M52X3M56×3, M64X3
M70X3M76×3.M82×3, M90X3
Note: Commercial grade stainless nuts are sometimes also marked with material grades. 488
Performance grade
(Commercial grade)Wire
A2—50
A2—70
Raw material brand
(Special grade)
30CrMo
oCr18Nig
Cr17Ni12M02
4 Materials and their mechanical properties
4.0.1 The materials and mechanical properties of commercial grade fasteners shall meet the requirements of GB3098.1, GB3098.2 and GB3098.6.
4.0.2 The chemical composition, heat treatment system and mechanical properties of special grade fasteners shall meet the requirements of Table 4.0.2. Mechanical properties test specimens shall be cut from the upper edge of the rough surface after specified heat treatment. The specimen cutting positions are: 1) For rough surface diameter 40μ: take the sample at the center; (2) For rough surface diameter 10μn, take the sample at 1/4 of the diameter: The rough surface of equal length double-headed screw and full-thread stud shall be subjected to batch energy test. The rough surface of nuts shall be subjected to hardness test by batch.
Table 4.0.2 Mechanical properties requirements of special grade fastener materials Chemistry
35CrMnA·
25Ct2MoVA
oCrtsNis
OCr17Ni12M2
GR 3077
GBS077
GR3077
GR 1220
GH1220
Heat treatment system
Quenching and tempering (internal fire 50)
Quenching and tempering (surface fire 550)
Hongcheng (can be refracted 00
M24-~M80
Machine alkali performance (not small)
234-~285
269-·321
234~-285
234~-285
269~~321
21=-~277
: 35CrM0A for low temperature below 20℃, low temperature V-shaped Notch impact test, the average of the three selected impact work AW should not be less than 2 times, which should be indicated in the product contract. 489
5 Technical conditions
5.1 Commercial grade fasteners
Technical conditions of commercial grade fasteners. Including threads, performance grades, tolerances, surface defects, acceptance and packaging, etc., shall comply with the requirements of the corresponding national standards for fasteners.
5.2 Special grade fasteners
5.2.1 The source materials of special grade fasteners shall have the steel mill's certificate of conformity. 5.2.2 Special grade fasteners shall be sampled and inspected after batch heat treatment, and shall comply with the requirements of Table 4.0.2, and the mechanical properties of the products shall be guaranteed to be not less than Performance under sampling state 5.2.3 The thread size of equal length studs and full thread studs shall comply with the provisions of GB196, the thread tolerance shall comply with the provisions of CB197 g, and the manufacturing tolerance, surface defect reduction, etc. shall comply with the relevant requirements of G901. 5.2.4 Each threaded stud with a nominal factory force PN211.0MPa shall be subjected to magnetic particle inspection according to JB4730 one by one, and shall comply with the L-level requirements
5.2.5 The thread size of the special nut for pipe flange shall comply with the provisions of CB1u6, the thread tolerance shall comply with the provisions of GB197 6H, the manufacturing tolerance, surface defects, etc. shall comply with the relevant requirements of (J36170. 5.3 Inspection
5 .3.1 Commercial-grade fasteners
The delivery inspection of commercial-grade fasteners (hexagonal head bolts and nuts) shall be carried out in accordance with the requirements of the corresponding national standards. 5.3.2 Special-grade fasteners
The delivery inspection of special-grade fasteners is carried out in units of one batch, each batch refers to one furnace number, and products of the same type, specification and production process (when the length of the screw is less than 100mm, the length difference is 25mm, and when the length is greater than 100mm, the length difference is 50mm, which are all considered to be the same batch. The maximum batch of low-profile studs is 3,000 pieces, and the maximum batch of nuts is 5,000 pieces. 5.4 Surface treatment
Alloy steel fasteners should be bluing treated. Stainless steel fasteners are not surface treated. 5.5 Acceptance and packaging
The size, appearance, performance inspection, acceptance and packaging of fasteners shall be in accordance with the provisions of GB90. The manufacturer shall provide a quality certificate according to the requirements, including:
(1) Name of fastener (including product grade), specification, size and quantity; (2) Material brand or performance grade;
(3) Standard number (for fasteners with performance grade, GH standard number: for fasteners with material brand, HG:20631); (4) Factory date and inspection mark
6.0.1 Marking example
Marking example and steel stamp mark
Example 1: Hexagonal head bolts with thread specification M16, nominal length 1=80t and performance grade 8.8 are marked as: GB 5782
Hexagonal bolt, M16×80
Example 2: Double-ended stud with thread specification M36×3, nominal length 1=160mm, material grade 35CrMoA, marked as: HG 20634
Double-ended thread sample M36×3×160
35CrMoA
Example 3: Full-threaded stud with thread specification M24, nominal length /-120mm, material grade 25Cr2MoVA. Marked as:
HG 20634
Full-threaded stud
M21X120
25Cr2MoVA
Example 4: Angle nut with thread specification M12 and performance grade 10, marked as: GB 6170
Example 5: The special nut for pipe flange with thread specification of M56×3 and material of 30CrMo is marked as: HG 20634
M56×3
30CrMo
6.0.2 The performance grade or material grade code is marked on the top of the head of the hexagonal head bolt, the top of the stud, and the side of the nut by steel stamp or other methods
6.0.3 The performance grade or material grade code is shown in Table 5.0.3-1 and Table 6.0.3-2. Table 6.0.3-1 Performance grade code
Performance grade
Material grade
30CrMo
Material grade code
Table 6.0.32
35CMaA|| tt||25Cr2MoVA
Note: For 35CrMA subjected to low source impact test, the code should be followed by \L” as above 492
0Crl8Nig
oC-17Ni12Mo2
Regulations for the use of fasteners
7.0.1 The use conditions of grade hexagonal head bolts and nuts shall meet the following requirements: (1) PN2.oMPa (Clsss150);
(2) Non-violent circulation occasions
(3) Use non-metallic gaskets;
(4) The medium is non-flammable, non-explosive and non-toxic. 7.0.2 In addition to the requirements of 7.0.1, special-grade studs (double-ended or full-threaded screws) should be used. Spiral wound pads, metal-clad pads, toothed combination pads, metal pads and other semi-metal or metal gaskets should use high-radian studs (double-ended or full-threaded studs) such as 35CrMoA or 25CrMoVA.
7.0.3 Full-threaded studs should be used in high temperature, severe cycle situations or high-voltage conditions of PV15.0MPa. 7.0.4 According to the type of fasteners, product grade, adopted parts performance grade and material brand, the nominal pressure and working temperature range to be determined shall be in accordance with the provisions of Table 4. 493
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1Commercial-grade fasteners
The delivery inspection of commercial-grade fasteners (hexagonal head bolts and nuts) shall be carried out in accordance with the requirements of the corresponding national standards. 5.3.2Special-grade fasteners
The delivery inspection of special-grade fasteners shall be carried out in units of one batch, each batch refers to one furnace number, and products of the same type, specification and production process (when the length of the screw is less than 100mm, the length difference is 25mm, and when the length is greater than 100mm, the length difference is 50mm) are all considered to be the same batch. The maximum batch of low studs is 3,000 pieces, and the maximum batch of nuts is 5,000 pieces. 5.4Surface treatment
Alloy steel fasteners shall be bluing treated. Stainless steel fasteners are not surface treated. 5.5Acceptance and packaging
The size, appearance, performance inspection and acceptance of fasteners shall be carried out. According to the provisions of GB90, the manufacturer shall provide a quality certificate according to the package, the contents of which include:
(1) Fastener name (including product grade), specification, size, quantity: (2) Material brand or performance grade;
(3> Standard number (for those adopting performance grade, it is GH standard number: for those adopting material brand, it is HG:20631); (4) Factory date and inspection mark
6.0.1 Marking example
Marking example and steel stamp mark
Example 1: Hexagon head bolts with thread specification M16, nominal length 1=80t and performance grade 8.8 are marked as: GB 5782
Hexagonal bolt, M16×80
Example 2: Double-ended stud with thread specification M36×3, nominal length 1=160mm, material grade 35CrMoA, marked as: HG 20634
Double-ended thread sample M36×3×160
35CrMoA
Example 3: Full-threaded stud with thread specification M24, nominal length /-120mm, material grade 25Cr2MoVA. Marked as:
HG 20634
Full-threaded stud
M21X120
25Cr2MoVA
Example 4: Angle nut with thread specification M12 and performance grade 10, marked as: GB 6170
Example 5: The special nut for pipe flange with thread specification of M56×3 and material of 30CrMo is marked as: HG 20634
M56×3
30CrMo
6.0.2 The performance grade or material grade code is marked on the top of the head of the hexagonal head bolt, the top of the stud, and the side of the nut by steel stamp or other methods
6.0.3 The performance grade or material grade code is shown in Table 5.0.3-1 and Table 6.0.3-2. Table 6.0.3-1 Performance grade code
Performance grade
Material grade
30CrMo
Material grade code
Table 6.0.32
35CMaA|| tt||25Cr2MoVA
Note: For 35CrMA subjected to low source impact test, the code should be followed by \L” as above 492
0Crl8Nig
oC-17Ni12Mo2
Regulations for the use of fasteners
7.0.1 The use conditions of grade hexagonal head bolts and nuts shall meet the following requirements: (1) PN2.oMPa (Clsss150);
(2) Non-violent circulation occasions
(3) Use non-metallic gaskets;
(4) The medium is non-flammable, non-explosive and non-toxic. 7.0.2 In addition to the requirements of 7.0.1, special-grade studs (double-ended or full-threaded screws) should be used. Spiral wound pads, metal-clad pads, toothed combination pads, metal pads and other semi-metal or metal gaskets should use high-radian studs (double-ended or full-threaded studs) such as 35CrMoA or 25CrMoVA.
7.0.3 Full-threaded studs should be used in high temperature, severe cycle situations or high-voltage conditions of PV15.0MPa. 7.0.4 According to the type of fasteners, product grade, adopted parts performance grade and material brand, the nominal pressure and working temperature range to be determined shall be in accordance with the provisions of Table 4. 493
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1Commercial-grade fasteners
The delivery inspection of commercial-grade fasteners (hexagonal head bolts and nuts) shall be carried out in accordance with the requirements of the corresponding national standards. 5.3.2Special-grade fasteners
The delivery inspection of special-grade fasteners shall be carried out in units of one batch, each batch refers to one furnace number, and products of the same type, specification and same production process (when the length of the screw is less than 100mm, the length difference is 25mm, and when the length is greater than 100mm, the length difference is 50mm, which are all regarded as the same batch. The maximum batch of low studs is 3000 pieces, and the maximum batch of nuts is 5000 pieces. 5.4Surface treatment
Alloy steel fasteners shall be bluing treated. Stainless steel fasteners shall not be surface treated. 5.5Acceptance and packaging
The size, appearance, performance inspection and acceptance of fasteners shall be carried out. According to the provisions of GB90, the manufacturer shall provide a quality certificate according to the package, the contents of which include:
(1) Fastener name (including product grade), specification, size, quantity: (2) Material brand or performance grade;
(3> Standard number (for those adopting performance grade, it is GH standard number: for those adopting material brand, it is HG:20631); (4) Factory date and inspection mark
6.0.1 Marking example
Marking example and steel stamp mark
Example 1: Hexagonal head bolts with thread specification M16, nominal length 1=80t and performance grade 8.8 are marked as: GB 5782
Hexagonal bolt, M16×80
Example 2: Double-ended stud with thread specification M36×3, nominal length 1=160mm, material grade 35CrMoA, marked as: HG 20634
Double-ended thread sample M36×3×160
35CrMoA
Example 3: Full-threaded stud with thread specification M24, nominal length /-120mm, material grade 25Cr2MoVA. Marked as:
HG 20634
Full-threaded stud
M21X120
25Cr2MoVA
Example 4: Angle nut with thread specification M12 and performance grade 10, marked as: GB 6170
Example 5: The special nut for pipe flange with thread specification of M56×3 and material of 30CrMo is marked as: HG 20634
M56×3
30CrMo
6.0.2 The performance grade or material grade code is marked on the top of the head of the hexagonal head bolt, the top of the stud, and the side of the nut by steel stamp or other methods
6.0.3 The performance grade or material grade code is shown in Table 5.0.3-1 and Table 6.0.3-2. Table 6.0.3-1 Performance grade code
Performance grade
Material grade
30CrMo
Material grade code
Table 6.0.32
35CMaA|| tt||25Cr2MoVA
Note: For 35CrMA subjected to low source impact test, the code should be followed by \L” as above 492
0Crl8Nig
oC-17Ni12Mo2
Regulations for the use of fasteners
7.0.1 The use conditions of grade hexagonal head bolts and nuts shall meet the following requirements: (1) PN2.oMPa (Clsss150);
(2) Non-violent circulation occasions
(3) Use non-metallic gaskets;
(4) The medium is non-flammable, non-explosive and non-toxic. 7.0.2 In addition to the requirements of 7.0.1, special-grade studs (double-ended or full-threaded screws) should be used. Spiral wound pads, metal-clad pads, toothed combination pads, metal pads and other semi-metal or metal gaskets should use high-radian studs (double-ended or full-threaded studs) such as 35CrMoA or 25CrMoVA.
7.0.3 Full-threaded studs should be used in high temperature, severe cycle situations or high-voltage conditions of PV15.0MPa. 7.0.4 According to the type of fasteners, product grade, adopted parts performance grade and material brand, the nominal pressure and working temperature range to be determined shall be in accordance with the provisions of Table 4. 493
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1. Special grade studs (double-ended or full-threaded screws) should be used. Spiral wound pads, metal-clad pads, toothed combination pads, metal pads and other semi-metal or metal gaskets should use high-radian studs (double-ended or full-threaded studs) such as 35CrMoA or 25CrMoVA.
7.0.3 Full-threaded studs should be used in high temperature, severe cycle or high-pressure conditions of PV15.0MPa. 7.0.4 According to the type of fasteners, product grade, adopted parts energy grade and material brand, the nominal pressure and working temperature range to be determined should be in accordance with the provisions of Table 4. 493
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X06W--X98W
(F90 H)
(TE90z OID)
(82 ST)1. Special grade studs (double-ended or full-threaded screws) should be used. Spiral wound pads, metal-clad pads, toothed combination pads, metal-wrapped pads and other semi-metal or metal gaskets should use high-radian studs (double-ended or full-threaded studs) such as 35CrMoA or 25CrMoVA.
7.0.3 Full-threaded studs should be used in high temperature, severe cycle situations or high-voltage conditions of PV15.0MPa. 7.0.4 According to the type of fasteners, product grade, adopted parts energy grade and material brand, the nominal pressure and working temperature range to be determined should be in accordance with the provisions of Table 4. 493
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(001 ssa)
EXOGNX98
X06W--X98W
(F90 H)
(TE90z OID)
(82 ST)
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