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Chinese Standard: 'HGT20634-2009'
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HG/T 20634-2009English120 Add to Cart 0--15 minutes. Auto immediate delivery. Bolting for use with steel pipe flanges (Class designated) Valid HG/T 20634-2009
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HG/T 20634-2009
Chemical Industry Standard
of the People's Republic of China
Replacing HG 20632-1997
Bolting for use with steel pipe flanges
(Class designated)
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China
1. Scope ... 3 
2. Normative references ... 3 
3. Types, specification and dimension of bolting ... 4 
3.1 Bolting type ... 4 
3.2 Hexagon head bolts ... 4 
3.3 Full thread bolts ... 4 
3.4 Screw nuts ... 5 
4. Materials... 7 
5. Usage of bolting ... 8 
6. Dimension tolerance ... 24 
7. Surface treatment ... 24 
8. Inspection ... 24 
9. Acceptance, packaging and quality certificate ... 24 
10. Labeling and marking ... 25 
Appendix A (Informative Appendix) Plain Washers for Pipe Flange Bolting ... 26 
Appendix B (Informative Appendix) Bolting and Insulated Members for Insulated
Flanges ... 28 
1. Scope
This standard specifies the type, dimension, material, labeling, technical requirements
and application of bolting for steel pipe flanges (C1ass designated).
This standard is applicable to the bolting for steel pipe flanges (including. hexagon head
bolt, full thread bolt and screw nut) specified in HG/T 20615, HG/T 20623.
2. Normative references
The following standards contain provisions which, through reference in this text,
constitute provisions of this national standard. For dated reference, subsequent amendments
(excluding amending error in the text) to, or revisions of, any of these publications do not
apply. However, parties to agreement based on this standard are encouraged to research
whether the latest editions of these references are applied or not. For undated references, the
latest edition of the normative document is applicable to this national standard.
"Fasteners-Ends of Parts with External Thread" GB/T 2
"Fasteners--Acceptance Inspection" GB/T 90.1
"Fasteners--Marking and Packaging” GB/T 90.2
"General Purpose Metric Screw Threads—Basic Dimensions " GB/T 196
"General Purpose Metric Screw Threads—Tolerance" GB/T 197
"Double End Studs (clamping type)-Product Grade B” GB/T 901
"Stainless Steel Bars" GB/T 1220
"Alloy Constructional Steel" GB/T 3077
"Mechanical Properties of Fasteners-Bolts, Screws and Studs" GB/T 3098.1
"Mechanical Properties of Fasteners—Nuts—Coarse Thread" GB/T 3098.2
"Mechanical Properties of Fasteners-Stainless Steel Bolts, Screws and Studs" GB/T
"Mechanical Properties of Fasteners—Stainless Steel Screw Nuts” GB/T 3098.15
"Tolerances for Fasteners-Bolts, Screws, Studs and Screw Nuts” GB/T 3103.1
"Laminated Rods" GB/T 5133—1985
"Hexagon Head Bolt" GB/T 5782
"I-type Hexagon Nuts” GB/T 6170
"Fasteners-Surface Discontinuities-Bolts, Screws and Studs for General Requirements"
GB/T 5779.1
"Fasteners-Surface Discontinuities-Nuts" GB/T 5779.2
"Fasteners-Surface Discontinuities-Bolts, Screws and Studs for Special Requirement"
GB/T 5779.3
"Steel Pipe Flanges (C1ass designated)" HG/T 20615
"Large-diameter Steel Pipe Flanges (C1ass designated)" HG/T 20623
"Specification for Selection of Steel Pipe Flanges, Gaskets and Bolting (C1ass
4.0.4 Continued
Grade Chemical composition (Standard number) Heat treatment system Specification
Mechanical property
HB бb бa δ5(%)≥
0Cr18Ni9 GB/T 1220 Solid solution — 515 205 40 ≤187
0Cr17Ni12M02 GB/T 1220 Solid solution — 515 205 40 ≤187
A193, B8-2 ASTM A193 Solid solution + strain hardening
≤M20 860 690 12
>M20~M24 795 550 15
>M24~M30 725 450 20
>M30~M36 690 345 28
A193, B8M-2 ASTM A193 Solid solution + strain hardening
≤M20 760 665 15
>M20~M24 690 550 20 ≤321
>M24~M30 655 450 25
>M30~M36 620 345 30
A320, L7b ASTM A320 Slack quenching (tempering≥620℃) ≤M65 860690725550 1618 -≤235
A453, 660 ASTM A453 Solid solution + strain hardening — 895 585 15 ≥99
a Low temperature notch impact test shall be carried out for 35CrM0 which is used at
lower than - 20℃, and the average value of its three impact energy Akv shall not be lower
than 27J, which shall be indicated at ordering.
b When it is used at above -100℃, the minimum impact energy of the low-temperature
impact test shall be 27J.
4.0.5 The mechanical property test shall be carried out for the roughcast of full thread bolt
batch by batch. The h......
Related standard:   HG/T 20627-2009  HG/T 20628-2009
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