HG/T 21573.2-1995 Large diameter stud HG/T21573.2-1995 Standard download decompression password: www.bzxz.net

Large diameter studs
HG/T 21573.2—95
1 Subject content and scope of application
This standard specifies the structural dimensions and technical requirements of large diameter studs for pressure vessel equipment flanges and manhole flange connections. 21
GB3077
GB4162
GB1800~1804
GB11821184
GB-151||tt ||GB2106
JB4730
HG/T21573.1
HG/T21573.3
HG/T21573.4
Cited standards
《Technical conditions for high-quality carbon structural steel》
《Technical conditions for alloy structural steel》
《Ordinary thread basic dimensions》
《Ordinary thread public "Tolerances and Fits"
"Ultrasonic Flaw Detection Method for Forged Steel Bars"
"Tolerances and Fits"
"Fastener Tolerances - Bolts, Screws and Nuts""Shape and Position Tolerance Codes, Notation Methods and Definitions""Steel Pressure Vessels"
"Steel Shell and Tube Heat Exchangers"
"Metal Tensile Test Method"
"Metal Brinell Hardness Test Method"
"Metal Charpy (V-Notch) Impact Test Method""Non-destructive Testing of Pressure Vessels"
"Materials Selection Regulations for Steel Chemical Vessels"
"Bolt Hydraulic Tightening Device Series"
"Large Diameter Nuts"
"Spherical Washers"
Types and Dimensions of Large Diameter Studs
3.1BT Studs
BT studs are entry stud structures, available in three types: I, I, and straight. Its structure, size and weight are shown in Figure 3.1 and Table 3.11~2 respectively. Type 1 is used with AR and AH hydraulic tensioners: Type 1 is used with BR and BH hydraulic tensioners, and type is used for manual tightening and matching with H-type nuts. c0.86d
Figure 3.1BT type double-headed stud (I, I, subtype) 23
Stud specifications
M48×4
M85×4
M100×4
M105X4
M110X4
M115X4
M120X4
M125X4
M130X4
M140X4
BT-Ⅱ
BT type stud structure dimension table
According to the calculation formula listed in Section 6.2, the 0
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3.2BS type stud
BS type stud is a common stud structure, divided into three types: I, I, and I. Its structure type, size and weight are shown in Figure 3.2 and Table 3.2-1~2 respectively. Type 1 is used with AR and AH hydraulic tensioners, Type 2 is used with BR and BH hydraulic tensioners, and Type 3 is used for manual tightening and is used with H nuts. 20
Figure 3.2BS type double-end stud (1, 1, photo type) 0.86d
Stud specifications
M56×4
M85×4
M100×4
M105X4
M110×4
M115×4
M120X4
M125×4||tt ||M130X4
M140×4
BS-Blue
BS type stud size table
Calculate according to the calculation formula listed in Section 6:0 as needed27
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4 Dimensions and tolerances
The basic dimensions of the thread shall be in accordance with GB196, the tolerance shall be in accordance with 6g specified in GB197, and the thread root shall be round. Other dimensional tolerances of the stud shall be in accordance with Class A in GB3103.1.
5 Material and manufacturing technical requirements for studs
5.0.1 The material of studs shall comply with the provisions of GB699 or GB3077, and the heat treatment system and mechanical properties after heat treatment shall be in accordance with Table 5-1. The mechanical property test specimen shall be cut along the rolling direction from the rough piece after the specified heat treatment, and the position of the test specimen shall be 1/4 of the diameter.
Table 5-1
Tensile strength
35CrMoA
25Cr2MoVA
Material standard
GB3077
GB3077
Stud specifications
M48~M80
>M80~M105
M48~M105
>M105~M140
Heat treatment system
≥510
≥805
≥735
≥805|| tt||≥735
Yield point
≥295
≥685
≥685
≥590
Elongation
Impact energy
234~285
234~285
245~277
245277
Forged steel bars shall be ultrasonically inspected in accordance with GB4162 "Ultrasonic flaw detection method for forged steel bars" and meet Class B requirements. After finishing, magnetic particle flaw detection is required for studs. Cracks, burrs and other defects are not allowed. The surface of the stud shall be phosphated.
Calculation of stud lengthWww.bzxZ.net
6.1 Explanation of symbols
6—Thickness of flange or manhole cover, mm;
b—Thickness of other flange or non-screw-in connector, mm;C
Gap between two flanges or connectors, mm;H—Height after assembly of AR or AH hydraulic tensioner and lock nut, mm;H. The sum of the heights of the nut and spherical washer after assembly. For round nuts, its value is the height of the round nut, mm, and the depth of the screw hole, mm;
L,—The protruding length of the stud when using BR or BH hydraulic tensioner, mm. 6.2 Calculation of stud length for screw-in connection structure When one side of the flange connection adopts a screw-in connection structure and uses BT studs, the stud length L can be calculated according to the following formula.
(1)For BTI type studs
L=/+b+C+H+(10~15)mm
(2)For BT-1 type studs
L=1+6+C+H. +L
(3)For BT straight type studs
L=1+b+C+H+(15～30)
6.3 Calculation of stud length for common connection structure
(6—1)
(6—2)
(6—3)
When the flange connection adopts a non-screw-in common connection structure and uses BS type studs, the stud length L can be calculated according to the following formula.
(1) For BSI type studs
L=b+6+C+H.+H+(25~45)
(2) For BS-1 type studs
L=b+h+C+2H. +L,+(15~30)
（6-5)
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