This standard specifies the specifications, dimensions, manufacturing process, technical requirements, test methods, inspection rules, marking, packaging and quality certificates of austenitic stainless steel welded steel pipes for shell and tube heat exchangers in industries such as chemical, petrochemical, and pharmaceutical industries. This standard applies to austenitic stainless steel welded steel pipes for shell and tube heat exchangers. HG 20537.2-1992 Technical requirements for austenitic stainless steel welded steel pipes for shell and tube heat exchangers HG20537.2-1992 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
Technical Requirements for Austenitic Stainless Steel Welded Steel Pipes for Shell and Tube Heat Exchangers HG 20537.2-92
Main Unit: Chemical Industry Non-Equipment Technology Center Approval Department: Ministry of Chemical Industry
Case Date: 1 9 915F1 Japanese
China Industrial Gas Network
cngasos.com
MPTUJPURMPTU
WwW. Various American Standards
1 Main Content and Applicable Scope
This standard specifies the specifications, dimensions, optional processes, technical requirements, test methods, inspection rules, and markings, packaging and certification documents of austenitic stainless steel welded tube heat exchangers in the chemical, petrochemical, pharmaceutical and other industries. This standard applies to austenitic stainless steel welded tube heat exchangers (hereinafter referred to as tubes). Various Standards
2 Reference Standards
GB222 "Chemical Decomposition of Steel Using Sample Sampling Method to Set Chemical Decomposition of Finished Products"
GP228 "Metal Segment Elongation Test Method"
B24] National Pipe Liquid Test Method
GB242 Test method for gold separation and expansion 3
GB24S Test method for gold pipe pressure 3
2_92 Short provisions for steel acceptance, packaging, marking and quality assurance GB2975 Mechanical and process testing and sampling provisions G44233 Stainless steel hot rolled steel strip 3
G3 423! Stainless steel and heat resistant cold rolled steel strip 4334.5 Stainless steel acid and corrosion test method 2G2 gold Full Ge Yin Pi test square up to 2
G3154 Zhao vortex violation detection method
HK: 20:37.: "Austrian stainless steel and pipe delivery regulations" customer standard line
3 size, shape and weight
3.0.1 welding etc. common specifications see table 3.0.1. after the supply and demand parties negotiate, can produce the welding pipe of specifications other than 3.0.1:
specifications and flux
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Austrian long body steel M
D01Ni14Mn2, table unit Huaguan flat rat bottom increase D. Various standards
3.2 Welding length
3.2.1 The length of the nozzle is 3m1-9, the length of the welding reputation can be produced by the agreement between the supply and demand parties.
3.2.1.1 The welded pipe is usually supplied in fixed length or side length. When confirming the goods, the user should put forward his specific fixed length requirements.
3.2.2.2 The fixed length of the welded pipe should be within the normal length range. The allowable deviation is +Eeam.
3.2.2.3 The length of the welded pipe should be within the normal length range. The allowable deviation is +5mm. Each multiple length should have a cut margin of 5mm--15mm. 3.0.3 Appearance
3.0.3.1 The welded parts with a fixed length of 1m must not be more than 1.0m. 3.0.3.2 The ends of welded pipes shall be free of burrs. The two ends shall be perpendicular to the axis of the steel pipe. 3.0.4 Delivery shall be based on actual weight, and payment may be based on theoretical weight. Table 3.0.1 lists the commonly used theoretical weights. Theoretical weight calculation formula: Nickel (Type) Austrian stainless steel Rust-resistant male Tianda wood brocade system Where: W (. (02491+(1)-t) W = 0, 02507t(Dt)
W weld joint protection weight, kg/m
D weld outer grid mm
t~-seat thickness, mn.
New degree g/e
3.0.5 The outer diameter tolerance of welded pipe, including ellipticity, is divided into 1 and I grades, respectively according to the table of various standards
1 extreme outer diameter deviation
micro 3. 0. 5-1
±0 10
25--38. 0
51--63
【Grade outer diameter deviation
21~40
Table 3.0.5-2
Light allowance
3.0.6 The allowable deviation of the welded steel wall (excluding the chain) is the specified wall diameter ±10 mm, but the minimum allowable deviation is 20.m. After double cutting, some allowable compensation of 118% can be required.
Various standards
4 Technical requirements
4.0.1 The chemical composition (refining analysis) of the strip used for welded pipes shall comply with the provisions of GB423 and GB423 net. The strips listed in Table 4.C, 1 of the welded pipe are made of hot-melt or emulsified steel. With the agreement of the two parties, it can also be made of other grades of austenitic stainless steel strips, Table 4.D. 1
CrigNi!
oCEN:oT
(1Cr\gNsn:
00Cr19Ni10
(Cr17Ni12Mo2
00Cr17N14Vr:2
Cabinet equivalent to AisI number
Editor: tt1eNigri is not recommended to use steel number 4.0.2 The welding method of austenitic stainless steel parts for heat exchangers shall not include plasma welding and whole furnace welding. Copper grids shall not be spliced. In order to remove the inner height of the weld, cold pressing (rolling) and other cold processing processes can be used. Austenitic stainless steel welded steel pipes for heat exchangers can also be welded by resistance welding, but the inside must be cleaned. 4.0.3 Other specified welded pipes should be solidified and passivated. If the protective gas is used for heat treatment, the acid purification treatment after heat treatment can be exempted. The recommended heat treatment is shown in Table 4.0.3. Various standard specifications and mechanical properties of heat treatment and mechanical properties Recommended heat treatment system 1010 above central 920 above cold 0 above fast CCr19Ni10 NM21 with fast GOCIN+M21CJC above fast control This small ten says HRB benzene small ten not more than method
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