HG/T 20537.1-1992 Selection requirements for austenitic stainless steel welded steel pipes
Some standard content:
Industry Standard of the People's Republic of China
Selection Rules for Austenitic Stainless Steel Welded Steel Pipes HG 20537. 1-92
Editor: Equipment Design Technology Center of the Ministry of Chemical Industry Approval Department: Ministry of Chemical Industry Implementation Date: May 1, 1993
Editorial Center for Engineering Construction Standards of the Ministry of Chemical Industry
1993 Beijing
wWw.bzsosD.com
1 Subject Content and Scope of Application
This standard specifies the specifications, technical requirements, use regulations and relevant design parameters of austenitic stainless steel welded steel pipes for chemical, petrochemical, pharmaceutical and other industries. This standard applies to austenitic stainless steel welded steel pipes for heat exchanger tube bundles, container shells, nozzles and pipelines.
Note: The austenitic stainless steel referred to in this standard also includes austenitic-ferrite duplex stainless steel. 1
m2Reference standards
GB150 "Steel Pressure Vessels"
GB151 "Steel Shell and Tube Heat Exchangers"
GB3323 "Radiographic Quality Grading of Steel Fusion Welded Butt Joints" HGJ15 "Provisions for Material Selection of Steel Chemical Containers" HGJ19 "Technical Regulations for Steel Low-Temperature Pressure Vessels" HGJ43 "Classification of Toxicity Hazards and Explosion Hazards of Chemical Media in Pressure Vessels"
HG20537.2 "Shell and Tube Heat Exchangers"
HG20537.3 "Technical requirements for austenitic stainless steel welded steel pipes for chemical equipment" HG20537.4 "Technical requirements for large-diameter austenitic stainless steel welded steel pipes for chemical equipment"
3 Material technical requirements and manufacturing process
3.0.1 Austenitic stainless steel welded steel pipes for shell and tube heat exchanger tube bundles shall comply with the requirements of HG20537.2 "Technical requirements for austenitic stainless steel welded steel pipes for shell and tube heat exchangers".
3.0.2 Austenitic stainless steel welded steel pipes for pressure vessel shells, nozzles and other tubular pressure-bearing components (such as coils, pipelines, pipe fittings, etc.) shall comply with the requirements of HG20537.3 "Technical requirements for austenitic stainless steel welded steel pipes for chemical equipment" and HG20537.4 "Technical requirements for large-diameter austenitic stainless steel welded steel pipes for chemical equipment". 3.0.3 The manufacturing process of argon-based stainless steel welded steel pipes (hereinafter referred to as welded pipes) shall comply with the provisions of Table 3.0.3.
Manufacturing process of stainless steel welded pipes
Welded steel pipes for heat exchange tubes
Welded steel pipes for chemical equipment
(such as pipes, shells, pipelines
Large-diameter welding for chemical equipment
Manufacturing process
Automatic arc welding (without welding wire) If necessary, cold processing should be performed: resistance welding, internal burrs must be removed Automatic arc welding (without welding wire) If necessary, cold processing can be performed; resistance welding, internal burrs must be removed Arc welding (with welding wire)
Note: Automatic arc welding refers to automatic argon arc welding and plasma welding. Table 3.0.3
Technical requirements
HG 20537.2
HG20537.3
HG20537.4
3.0.4 Welded pipes produced according to foreign austenitic stainless steel welded steel pipe standards listed in Appendix A can be considered to have technical requirements equivalent to HG20537.2, HG20537.3 and HG20537.4 (Note).
Note: Foreign manufacturers producing according to foreign standards must have qualifications approved by internationally recognized quality inspection organizations, such as TüV, Swedish ASS (NBOSH), Lloyd's Register of Shipping (Lloyd), ASME, etc.
4 Usage regulations
4.1 Specifications
4.1.1 Pipe The specifications of welded steel pipes for shell heat exchangers are selected according to Table 4.1.1. Due to special reasons, welded steel pipes with specifications other than those in Table 4.1.1 may also be used. Specifications of heat exchange tubes
(1.4)/1.6
Note: Specifications in brackets are uncommon specifications. 4
.0(2.3)12.6)
(2.9)3.23.64.0
.-
4.1.2 The nominal length of heat exchange tubes is generally 1000, 1500, 2000, 2500, 3000, 4500, 6000, 7500, 9000.12000mm. The fixed length or multiple length of welded steel pipes should be selected according to the design length of the heat exchange tubes. 4.1.3 The common specifications (outer diameter and wall thickness) of welded steel pipes for chemical plants are selected according to Table 4.1.3-1. Other specifications of welded steel pipes may be used after negotiation between the supply and demand parties. Large diameter welded pipes are selected according to Table 4.1.3-2, but welded pipes of other wall thickness specifications may also be used according to the common steel plate thickness specifications.
4.1.4 The length of welded steel pipes for chemical plants is generally not fixed. Usually, the length supplied by welded pipe manufacturers is 6m.
Outer diameter and wall thickness of welded steel pipes for chemical equipment (mm)
Internationally used series
76.1(73.0)
139.7(141.3)
Domestic coastal series
Table 4.1.3-1
Wall thickness series number (Sch.No)
Note: The outer diameters in brackets (73.0, 141.3) are quite different from the internationally used series and conform to the outer diameter of US ANSIB36.19.
Internationally used series
Outer diameter and wall thickness of large diameter welded pipes
Domestic series
Table 4.1.3-2
Wall thickness series number (Sch.No)
4.2 Specification selection
The selection of welded pipe outer diameter should comply with the provisions of Table 4.1.2, Table 4.1,3-1 and Table 4.1.3-2 as far as possible. The selection of two outer diameter series shall comply with the relevant provisions of engineering design and shall be clearly indicated to avoid confusion.
4.2.2 The selection of welded pipe wall thickness shall comply with the provisions of 4.6. When using tapered pipe thread connection on steel pipe, welded pipes with outer diameters that meet the internationally used series shall be selected, and the wall thickness shall be at least 40S series. 4.3 Allowable stress
4.3.1 The allowable stress of welded pipes at different temperatures shall be in accordance with the provisions of Table 4.3.1-1. For steel grades not listed in the table, the allowable stress shall be divided by the safety factor in Table 4.3.6
1-2 according to the strength data of the materials, and the minimum value shall be taken. When the temperature is lower than 20℃, the allowable stress at 20℃ shall be taken without taking into account the safety factor within the creep temperature range). Allowable stress of common austenitic stainless steel
(equivalent to AISI
code)
OCr18Ni9
0Cr18Ni10Ti
(1Cr18Ni9Ti)
00Cr19Ni10
OCr17Ni12Mo2
00Cr17Ni14Mo2
(316L)
Allowable stress at the following temperatures
Table 4.3.1-1
Using the allowable stress values listed in the table, the steel pipe may cause a permanent deformation of no more than 0.1%. If the above-mentioned trace permanent deformation is not allowed, the allowable stress values in brackets can be used. iCr18Ni9Ti is a steel grade that is not recommended for use. Safety factor
Minimum tensile strength at room temperature
Minimum yield strength at palm temperature
Table 4.3.1-2
Yield strength at design temperature
Note: When using the table n, the steel pipe may cause a permanent deformation of no more than 0.1%. If the above-mentioned trace permanent deformation is not allowed, the safety factor of the yield strength at the design temperature should be increased to ≥1.5
4.3.2 When the allowable stress value of the welded steel pipe is used for the wall thickness calculation under internal pressure, it should be multiplied by the weld coefficient specified in 4.4.
4.4 Longitudinal weld coefficient
4.4.1 According to the welding process and technical requirements, the longitudinal weld coefficient of austenitic stainless steel welded steel pipe shall be in accordance with the provisions of Table 4.4, 1. Longitudinal weld coefficient of weld
weld for heat exchange tube
joined steel pipe
for chemical equipment
welded steel pipe
according to HG 20537.2
According to HG20537.3wwW.bzxz.Net
For chemical equipment
Welding process
Automatic arc welding without wire
Arc welding or resistance welding
Automatic arc welding without wire
Arc welding or resistance welding
Welding seam coefficient level
100% eddy current flaw detection
100% eddy current flaw detection
Double-sided arc welding with wire 100% radiographic flaw detection
Arc welding or gold welding equivalent to
Double-sided welding
Transparent single-sided automatic arc welding
Large-diameter welding according to HG20537.4 Solitary welding
Wired single-sided automatic arc welding
Local radiographic flaw detection
(20%)
No film
Local radiographic flaw detection
(See 4.4.3)
No film
4.4.2 Radiographic flaw detection of welded steel pipes shall comply with the provisions of GB3323. The inspection results shall be qualified for the Jiang grade for 100% flaw detection and qualified for the sub-grade for partial flaw detection, but incomplete penetration is not allowed. The inspection length of partial flaw detection shall not be less than 20% of the length of each weld. 4.4.3 For large-diameter welded pipes that are only used for pipelines and are welded by wired single-sided automatic arc welding, the inspection length of the weld local flaw detection is 150mm for each welder, and 15m of the weld should be radiographically inspected, and the class is qualified.
4.4.4 The longitudinal weld coefficients listed in Table 4.4.1 are only used for the calculation of the wall thickness of the steel pipe under internal pressure. When the welded steel pipe is subjected to external force, axial compression, axial tension, bending, expansion, flexibility, etc., it is not necessary to include it in the longitudinal weld coefficients specified in Table 4.4.1. 4.4.5 When welded steel pipes are used for pressure vessels, a manufacturing process with a longitudinal weld coefficient Φ not less than 0.85 should be adopted.
Welded steel pipes with a longitudinal weld coefficient of less than 0.85 can only be used for containers, parts and pipelines with a maximum working pressure of less than 0.IMPa or not subject to the "Pressure Vessel Safety Technical Supervision Regulations" of the Ministry of Labor.
4.5 Scope of use
4.5.1 The use pressure of austenitic stainless steel welded steel pipes shall be in accordance with the following provisions: 4.5.1.1 The design pressure of welded steel pipes used as heat exchange tubes, container shells, pipes, coils, etc. should generally not exceed 4.0MPa. The applicable pipeline pressure level of welded steel pipes used as fluid conveying pipes and pipe fittings should generally not exceed PN5.0MPa (300 pound grade). 4.5.2 The service temperature range of welded steel pipes is -196~+400℃. Welded steel pipes with added welding wires and service temperature below 70℃ should be evaluated for welding process in accordance with the requirements of HG19 "Technical Regulations for Steel Low-temperature Pressure Vessels". The low-temperature (design temperature) impact energy of weld metal, the average value of three standard specimens (10×10×55mm) should not be less than 321, and the minimum value of a single specimen should not be less than 27. Steel pipes with wall thickness series 5S are generally suitable for pipeline projects with temperatures not higher than 200℃. However, they are not subject to the restrictions of this article when used in other occasions. 4.5.3 Quality and environment
4.5.3.1 Welded steel pipes with longitudinal weld coefficient Φ-1.00 should not be used in chemical equipment that handles or transports extremely or highly hazardous chemical media. 4.5.3.2 If the heat exchange tubes comply with HG20537.2-92 "Technical Requirements for Austenitic Stainless Steel Welded Steel Tubes for Shell and Tube Heat Exchangers", and are completely enclosed in the shell of a pressure vessel, they can be used in situations with extremely or highly hazardous media, and other pressure-bearing components on the other side do not need to comply with the regulations for extremely or highly hazardous media pressure vessels. The classification of the toxicity hazard and explosion hazard of the medium shall comply with the provisions of HGJ43 "Classification of Toxicity Hazards and Explosion Hazards of Chemical Media in Pressure Vessels". 4.5.3.3 In situations where the medium has the possibility of stress corrosion cracking of austenitic stainless steel, the welded steel pipe must be subjected to solid solution or stabilization treatment after welding. 4.5.3.4 If the excess height inside the weld will endanger the flow, cleaning, reaction or accelerated corrosion and scaling of the medium in the pipe, the excess height inside the weld should be removed. For electric resistance welded pipes, the excess height inside the weld must be removed.
4.5.3.5 Since the inner side excess height of the weld will affect the expansion of the heat exchange tube and the tube sheet, the inner side excess height of the weld of the heat exchange tube end should be removed, and the removal length should not be less than the thickness of the tube sheet. 4.5.3.6 When the welded pipe is used in an environment that may cause intergranular corrosion of austenitic stainless steel, the intergranular corrosion test should be carried out in accordance with the requirements of HGJ15 "Regulations on the Selection of Materials for Steel Chemical Containers". The sample should include the longitudinal weld of the welded pipe, and the sample state is the supply state after sensitization treatment. Under normal circumstances, the sensitization system is 650℃ for 2 hours. When it meets the requirements of 4.3.5 in HGJ15 "Regulations on the Selection of Materials for Steel Chemical Containers", the sensitization system is allowed to be 650℃ for half an hour.
4.5.3.7 When the operating conditions meet the following requirements at the same time, the heat treatment and/or pickling and passivation treatment of the welded pipe can be exempted (except for large-diameter welded pipes). However, when used in clean places, the welded pipe should be pickled and passivated:
a: The medium is non-toxic, non-explosive, and has no tendency to corrode the material; the operating pressure is not greater than 1.OMPa;
c. The working temperature is not greater than 200℃.
4.5.3.8 When heat treatment is performed in a protective atmosphere, pickling and passivation treatment can be exempted. 4.6 Design calculation
4.6.1 The design calculation of welded steel pipes as pressure-bearing components shall comply with the relevant provisions of GB150 "Steel Pressure Vessels" and GB151 "Steel Shell and Tube Heat Exchangers" according to the application situation.
4.6.2 When welded steel pipes are used to connect branch pipes and main pipes such as headers and tees, if the branch pipe does not intersect with the longitudinal seam of the main pipe, the longitudinal weld coefficient of the main pipe may not be included in the reinforcement calculation. If the branch pipe inevitably intersects with the longitudinal seam of the main pipe, the longitudinal weld coefficient of the main pipe should be included. When calculating the branch pipe, the longitudinal weld coefficient of the branch pipe should be included. 4.7 Allowable stress and longitudinal weld coefficient of welded steel pipe The allowable stress and longitudinal weld coefficient Φ of welded steel pipes shall be in accordance with the provisions of 4.3 and 4.4. 115 Since the inner excess height of the weld will affect the expansion of the heat exchange tube and the tube sheet, the inner excess height of the weld at the end of the heat exchange tube should be removed, and the removal length should not be less than the thickness of the tube sheet. 4.5.3.6 When the welded pipe is used in an environment that may cause intergranular corrosion of austenitic stainless steel, the intergranular corrosion test should be carried out in accordance with the requirements of HGJ15 "Regulations on the Selection of Materials for Steel Chemical Containers". The sample should include the longitudinal weld of the welded pipe, and the sample state is the supply state after sensitization treatment. Under normal circumstances, the sensitization system is 650℃ for 2 hours. When it meets the requirements of 4.3.5 in HGJ15 "Regulations on the Selection of Materials for Steel Chemical Containers", the sensitization system is allowed to be 650℃ for half an hour.
4.5.3.7 When the operating conditions meet the following requirements at the same time, the heat treatment and/or pickling and passivation treatment of the welded pipe can be exempted (except for large-diameter welded pipes). However, when used in clean places, the welded pipe should be pickled and passivated:
a: The medium is non-toxic, non-explosive, and has no tendency to corrode the material; the operating pressure is not greater than 1.OMPa;
c. The working temperature is not greater than 200℃.
4.5.3.8 When heat treatment is performed in a protective atmosphere, pickling and passivation treatment can be exempted. 4.6 Design calculation
4.6.1 The design calculation of welded steel pipes as pressure-bearing components shall comply with the relevant provisions of GB150 "Steel Pressure Vessels" and GB151 "Steel Shell and Tube Heat Exchangers" according to the application situation.
4.6.2 When welded steel pipes are used to connect branch pipes and main pipes such as headers and tees, if the branch pipe does not intersect with the longitudinal seam of the main pipe, the longitudinal weld coefficient of the main pipe may not be included in the reinforcement calculation. If the branch pipe inevitably intersects with the longitudinal seam of the main pipe, the longitudinal weld coefficient of the main pipe should be included. When calculating the branch pipe, the longitudinal weld coefficient of the branch pipe should be included. 4.7 Allowable stress and longitudinal weld coefficient of welded steel pipe The allowable stress and longitudinal weld coefficient Φ of welded steel pipes shall be in accordance with the provisions of 4.3 and 4.4. 115 Since the inner excess height of the weld will affect the expansion of the heat exchange tube and the tube sheet, the inner excess height of the weld at the end of the heat exchange tube should be removed, and the removal length should not be less than the thickness of the tube sheet. 4.5.3.6 When the welded pipe is used in an environment that may cause intergranular corrosion of austenitic stainless steel, the intergranular corrosion test should be carried out in accordance with the requirements of HGJ15 "Regulations on the Selection of Materials for Steel Chemical Containers". The sample should include the longitudinal weld of the welded pipe, and the sample state is the supply state after sensitization treatment. Under normal circumstances, the sensitization system is 650℃ for 2 hours. When it meets the requirements of 4.3.5 in HGJ15 "Regulations on the Selection of Materials for Steel Chemical Containers", the sensitization system is allowed to be 650℃ for half an hour.
4.5.3.7 When the operating conditions meet the following requirements at the same time, the heat treatment and/or pickling and passivation treatment of the welded pipe can be exempted (except for large-diameter welded pipes). However, when used in clean places, the welded pipe should be pickled and passivated:
a: The medium is non-toxic, non-explosive, and has no tendency to corrode the material; the operating pressure is not greater than 1.OMPa;
c. The working temperature is not greater than 200℃.
4.5.3.8 When heat treatment is performed in a protective atmosphere, pickling and passivation treatment can be exempted. 4.6 Design calculation
4.6.1 The design calculation of welded steel pipes as pressure-bearing components shall comply with the relevant provisions of GB150 "Steel Pressure Vessels" and GB151 "Steel Shell and Tube Heat Exchangers" according to the application situation.
4.6.2 When welded steel pipes are used to connect branch pipes and main pipes such as headers and tees, if the branch pipe does not intersect with the longitudinal seam of the main pipe, the longitudinal weld coefficient of the main pipe may not be included in the reinforcement calculation. If the branch pipe inevitably intersects with the longitudinal seam of the main pipe, the longitudinal weld coefficient of the main pipe should be included. When calculating the branch pipe, the longitudinal weld coefficient of the branch pipe should be included. 4.7 Allowable stress and longitudinal weld coefficient of welded steel pipe The allowable stress and longitudinal weld coefficient Φ of welded steel pipes shall be in accordance with the provisions of 4.3 and 4.4. 11
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