Some standard content:
Fasteners for steel pipe flanges
(European system)
HG2061397
1 Subject content and scope of application
This standard specifies the types, specifications, technical requirements and application provisions of fasteners for steel pipe flanges (European system). This standard is applicable to fasteners for steel arm flanges (hexagonal head bolts, equal-length stud bolts, full-thread screws and nuts) 235
GB3077
GB 3098. 1
GB 3098.2
GB 3098.4
GB 3098.6
GB5782
GB 5785
GB6170
GB 6171
JB4730
Reference standards
Fastener external thread parts end》
Fastener acceptance inspection mark and packaging""Ordinary thread basic dimensions"
"Ordinary thread tolerance and fit"
Equal length studs - Grade B"
Or stainless steel"
"Technical conditions for alloy structural steel"
"Fastener mechanical properties bolts, screws and threads""Fastener mechanical properties nuts"
"Fastener mechanical properties fine pitch nuts
"Fastener mechanical properties stainless steel bolts screws, studs nuts""Hexagon head bolts - A and B grade》
《Hexagonal head bolt-fine thread-A and grade》
《Type I hexagonal nut-fine thread-A and grade B》
《Non-destructive testing of pressure vessels》
3 Types, specifications, and dimensions
3.0.1 The types of fasteners include hexagonal head bolts, equal-length studs, full-threaded studs, and upper hexagonal screws. 3.0.2: Hexagonal head bolts
1 The type and size of hexagonal head bolts for pipe flanges shall comply with the requirements of GB5782 (coarse thread) and GB5785 (fine thread). As shown in 3.0.2, the ends of the bolts shall be chamfered. Figure 3.0.2 Hexagonal head bolts
2 The grade of the fish head bolt is shown in Table 3.0.2. Table 3. 0.2 Specifications and performance grade standards for hexagonal head bolts
GB782-A and B grade countersunk teeth)
GB5785-A and R grade (period
3.0.3 Equal length double-headed screws
M10.M12.M16.M20,M24.M27
M30X 2.M33X2.M36×3,M39X3.
M45<3.M52x3.M56X3
Performance grade (commercial grade)
8. 8.A2 - 50,A2 - 70
8.8.A2--50.A2-70
The style and size of equal length studs for pipe flanges shall comply with the requirements of GB901, but the ends of the studs shall be chamfered. See Table 3.0.3. The thread specifications are M30X2, M33×2, M36×3, M39×3, M15×3, M48×3, M52×4, M56×3, and the small studs shall use fine pitch. The thread size and tolerance shall comply with CB196 and GB197. The stud ends shall comply with the requirements of GB2 chamfered ends. The rest shall comply with the requirements of B901. 237
Figure 3.0.3 Equal length studs
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
GB901-grade
(commercial grade)
HC20613
(special grade)
M10.M12, M16.M20.M24.M27
M30X2.M33X2.M36X3,
M39×3, M45X3, M18×3
M52X4.M56X4
! Performance grade
(commercial grade)
A2 --50
A2—7m
Material and number
(special grade)
35CrMGA.C.2MoVA.
:Cr.8N..17Ni1M.2
3.0.4 Fully threaded studs
The types and sizes of fully threaded studs for pipe flanges are shown in Figure 3.0.4, and the thread size tolerances conform to G13.931
and GB197. The screw ends shall comply with the requirements of GB2 angle ends, and the rest shall conform to the requirements of G991. Figure 3.0.4 Fully threaded studs
2. The specifications and material grades of fully threaded studs are shown in Table 3.0.4. 238
HG20513
3.0.5 Nuts
Table 3.0.4 Specifications and material grades of fully threaded flanges
M1U.M12.M16.M20.M24,M27.M30X2, M35x2,M36×3, M39×3.M.5×3.M48×3, M52×4.M56×4
Material grade
(Special grade)
35CrMoA.25C-2MαVA
OCr1&Ni9,0Cr17Ni12Mo2
1 The type and size of nuts for pipe flanges shall comply with the requirements of GB6170.GB6171, as shown in Figure 3.0.5. Figure 3.0.5 Nuts
The specifications and performance grades (commercial grade) and material grades (special grade) of nuts are shown in Table 3.0.5. Table 3.0.5 Specifications and performance grades of nuts, material grades Standards
GB5370-Grade A Grade B
(same thread, commercial grade ()
CH6Grade A Grade B
《fine thread, commercial grade》)
M10.M:2,M16.M20.M24:M27
M30X3.M33X 2.M36x3.M39X3.
M:5x3.M48X3,M52X1.M56X4
Note: The standard number of special twisted nuts should be IG20613. Performance level
(commercial grade)
Material brand
(special grade)
n:17:12Mu?
Material and mechanical properties
4.0.1 Commercial grade fasteners. The material and mechanical properties shall comply with GB30981, GB3098.2, GB3098.4, GB3098.5, GB3098.6, GB3098.7, GB3098.8, GB3098.9, GB3098.10, GB3098.11, GB3098.12, GB3098.13, GB3098.14, GB3098.15, GB3098.16, GB3098.17, GB3098.18, GB3098.19, GB3098.20, GB3098.21, GB3098.23, GB3098.44, GB3098.17, GB3098.18, GB3098.19, GB3098.25, GB3098.26, GB3098.27, GB3098.28, GB3098.29, GB3098.20, GB3098.21 ...3, GB3098.24, GB3098.25, GB3098.26, GB3098.27, GB3098.28, GB3098.29, GB3098.20, GB3098.29, GB3098.20, GB3098.21, GB3098 The hardness test of screws shall be carried out on a batch basis.
Table palm.? Mechanical properties requirements of special grade fastener materials Chemical composition
(East Standard)
300iMe
inCrMoAt
25C:2MoVA
OC1RNi9
HGtIN2Mu2
GB 307?
GB 3077
Gt5 3077
GE 1225
G51229
Heat treatment system
Quenched and tempered (same fire 550C) M56
Quenched and tempered Guoyan 5G ()
Yuan quality (return to 600)
Mechanical properties (small 『
234-~233
265--321
Note: For 35CrMoA with low humidity at -20℃, carry out low temperature V-shaped impact test at design temperature. The average temperature of the test partner should not be lower than 27[But it should be noted in the order contract 240
5 Technical conditions
5.0.1 Commercial grade fasteners
The technical conditions of commercial grade fasteners, including thread, performance grade, tolerance, surface defect, acceptance and packaging, shall comply with the requirements of the corresponding national standards for fasteners.
5.0.2 Special grade fastenersbZxz.net
1 The raw materials used for special grade fasteners shall have the steel mill's certificate of conformity. 2 Special grade fasteners shall be sampled and inspected after heat treatment in batches and shall comply with Table 4.0.2, and the mechanical properties of the product should not be lower than the performance under the sampling state. 3 The thread size of equal-length studs and full-thread studs shall comply with the provisions of CB196, the thread tolerance shall comply with the provisions of GB197, and the thread tolerance, surface defects, etc. shall comply with the relevant requirements of GB901. 4 Full-thread studs with a nominal pressure of PN210.0MPa shall be subjected to magnetic particle inspection according to IB4730 one by one, and meet the requirements of the same grade.
5.0.3 Inspection
1 Commercial-grade fasteners
The delivery inspection of commercial-grade fasteners (hexagonal head bolts, equal-length studs and nuts) shall be carried out in accordance with the requirements of the corresponding national standards.
2 Special-grade fasteners
The delivery inspection of special-grade fasteners is carried out in batches. Each batch refers to products produced with the same furnace number, the same type, the same specification and the same production process (the length of the stud is 25mm when the length is less than or equal to 100mm; the length difference is 5mm when the length is greater than 100mm, and they can all be regarded as the same batch). The maximum batch of studs is 3,000 pieces, and the maximum batch of nuts is 5,000 pieces. 5.0.4 Surface treatment
Fasteners made of gold-containing steel should be treated. Stainless steel fasteners are not subjected to surface treatment. 5.0.5 Size, appearance, performance inspection, acceptance and packaging of fasteners According to the provisions of GB90, the manufacturer shall provide quality certification for each batch, including:
(1) Name of fastener (including product grade), specification, size and quantity 2) Material brand and performance grade:
(3) Standard number [For performance grade (commercial grade), it is GB standard number; For material brand (special grade), it is HG206137
(4) Date of manufacture and inspection verification
Marking examples and steel stamp marks
6.0.1 Marking examples
Example 1. Thread specification M16, nominal length (-8
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