This standard specifies the basic requirements for welding of steel pressure vessels. This standard applies to steel pressure vessels welded by gas welding, electrode arc welding, submerged arc welding, gas shielded welding, electroslag welding and other methods. JB/T 4709-2000 Steel Pressure Vessel Welding Regulations JB/T4709-2000 Standard download and decompression password: www.bzxz.net

JB | |tt | |tt||Welding procedure qualification for steel pressure vesselsWelding specification for steel pressure vessels Mechanical property tests of productweldedtestcoupons for steel pressure vessels2000- Released on 08-15
National Machinery Industry Bureau
National Petroleum and Chemical Industry Bureau
Implemented on 2000-10-01
Released
About the release of "Steel Notice of four industry standards including welding process evaluation of pressure vessels
SINOMACH [2000] No. 401
Relevant units:
Pressure vessels according to the regulations of the State Administration of Quality and Technical Supervision Industry standard approval procedures, Western industry standards such as "Steel Pressure Vessel Welding Process Qualification" are now released. The numbers and names are as follows: Mandatory standards:
JB4708-2000 Steel Pressure Vessel Welding Process Qualification (replacing JB4708- 1992) JB4710-2000 Steel Tower Vessels (replacing JB4710-1992) JB4744-2000
Recommended standards:
Mechanical property inspection of welded test plates for steel pressure vessel products (replacing GB150-1998 Appendix E)
JB/T4709-2000
Steel Pressure Vessel Welding Regulations (replacing JB/T4709-1992) The above standards will be implemented on October 1, 2000, and its publication and distribution work is responsible for the whole country The Pressure Vessel Standardization Technical Committee was organized and completed on schedule. State Machinery Industry Bureau
National Petroleum and Chemical Industry Bureau
August 15, 2000
Item
79-53JB4708—2000 Preface to the Qualification of Welding Procedures for Steel Pressure Vessels
Scope
1
2
Quoted standards
3 Terminology
4 General principles
5 Butt welds, angles Weld welding procedure qualification rules 6 Corrosion-resistant surfacing welding procedure qualification rules-
Test requirements and result evaluation
Appendix A (standard appendix)
Appendix B (prompt appendix)| | tt | 1
2
3
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Scope-
Quoted Standard
Welding materials
Welding procedure qualification and welder·
Pre-welding preparation
Welding
Post-heating
Post-weld heat treatment
8|| tt||Weld repair
9
10 Welding inspection
Appendix A (standard appendix) stainless steel composite steel welding regulations..Appendix B (prompt appendix) recommended welding procedure regulations Table 79-CJB 4744—2000
Mechanical property inspection of welded test plates for steel pressure vessel products Preface·
Scope·
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Quoted standards·||tt ||3
symbol.,
4 Requirements for preparation of product welding test plates
5 Preparation of product welding test plates
Tensile test
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9
Bend test·
Impact test
Retest
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JB /T4709—2000
Welding regulations for steel pressure vessels
JB/T4709—2000
Previous
This standard is a revision of IB/T4709-1992. Words
This standard is based on the experience gained since the implementation of JB/T4709-1992, and has made the following changes with reference to recent international similar standards: 1 Added Appendix A "Welding Specifications for Stainless Steel Composite Steel" and Appendix B "Recommended Welding Procedure Specifications" sheet". 2The following content has been added to Chapter 3:
① The selection of welding materials should pass the welding procedure qualification requirements; ② The regulations for selecting welding rods from GB/T5118;? Some steel grades have been added to Table 1 and Table 3: || tt||④Added Table 2.
3 Chapter 5 adds Table 4, and Table 5 adds some steel numbers. 4 Chapter 8 adds regulations on the thickness of post-heat treatment of coal. Some steel grades have been added to Table 6, and the post-weld heat treatment temperature has been adjusted; Table 7 has been added.
This standard replaces JB/T4709-1992 for implementation purposes. Appendix A of this standard is an appendix to the standard.
Appendix B of this standard is a reminder appendix.
This standard was proposed by the National Pressure Vessel Standardization Technical Committee and is under the jurisdiction of the Manufacturing Subcommittee of the National Pressure Vessel Standardization Technical Committee.
The units responsible for drafting this standard: Hefei General Machinery Research Institute, Jinxi Chemical Machinery Factory and Dalian Petrochemical Design Institute. The main drafters of this standard: Ge Zhaowen, Long Hong, and Yan Guohua. The working units and personnel participating in the preparation of this standard include: Sinopec Group Consulting Company: Shou Binan, Yang Guoyi. Boiler and Pressure Vessel Safety Supervision Bureau of the State Administration of Quality and Technical Supervision: Gao Jixuan, Zhang Jianrong. China General Mechanical Engineering Corporation: Zhang Zhongkao. China Chemical Engineering Survey and Design Association: Liang Zhigou. Hefei General Machinery Research Institute: Li Jingchen. Liaoning Provincial Bureau of Quality and Technical Supervision: Chief, Jun. Dalian Bingshan Group Jinzhou Heavy Machinery Factory: Chen Yuheng. This standard was first published in April 1992.
This standard is interpreted by the National Pressure Vessel Standardization Technical Committee, 37
1 Scope
Industry Standards of the People's Republic of China
Welding Regulations for Steel Pressure Vessels||tt| |Welding specification for steelpressurevessels This standard specifies the basic requirements for welding of pinned pressure vessels. JB/T4709-2000
replaces JB/T4709-1992
This standard is applicable to steel pressure vessels welded by gas welding, electrode arc welding, submerged arc welding, gas shielded welding, electroslag welding and other methods. . 2 Reference standards
The provisions contained in the following standards constitute provisions of this standard through citation in this standard. When this standard is published, the versions indicated are valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB150—1998 steel pressure vessels
GB/T983—1995 stainless steel welding rods
GB/T5117—1995 carbon steel welding rods
low alloy steel welding rods
GB/T 5118 --19954
GB/T 52931985
Flux for submerged arc welding of carbon steel
GB/T14957—1994 Steel wire for fusion welding
GB/T14958—1994 Gas Steel wire for shielded welding JB4708—2000
JB4730—1994
JB 4733—1996
Welding procedure qualification of steel pressure vessels
Non-destructive testing of pressure vessels
Explosive stainless steel composite steel plate for pressure vessels Stainless steel rods and wires for inert gas shielded welding YB/T5091—1993
YB/T5092-1996
Stainless steel wire for welding
3 welding materials| |tt||3.1 Welding materials include welding rods, welding wires, steel strips, flux, gases, electrodes and pads, etc. 3.2 Principles for Selection of Welding Materials
Welding materials should be selected based on the chemical composition, mechanical properties, and welding performance of the base material, combined with the structural characteristics, usage conditions and welding methods of the pressure vessel, and determined through testing when necessary. The performance of the weld metal should be higher than or equal to the lower limit of the value specified in the corresponding base metal standard or meet the technical conditions specified in the drawing. The requirements for weld metal of various types of steel are as follows:
3.2.1 Weld metal of the same steel grade
3.2.1.1 Weld metal of carbon steel and low alloy steel should ensure mechanical properties performance, and its tensile strength should not exceed the upper limit specified in the base material standard plus 30MPa. The chemical composition of the weld metal of heat-resistant low alloy steel should also be guaranteed. Note: This standard divides the low alloy steel in GB150 into strength type low alloy steel, heat-resistant low alloy steel and low temperature type low alloy steel according to its performance. 3.2.1.2 The weld metal of high alloy steel should ensure mechanical properties and corrosion resistance. 3.2.1.3 The weld metal of the stainless steel composite steel base layer should ensure mechanical properties, and its tensile strength should not exceed the upper limit specified in the base material standard plus 30MPa; the weld metal of the cladding layer should ensure corrosion resistance. When there is mechanical Mechanical properties should also be guaranteed when performance requirements are met. State Machinery Industry Bureau
National Petroleum and Chemical Industry Bureau
38
Approved on 2000-08-15
Implemented on 2000-10-01
JB/ T 4709—2000
Transition welds should be used at the junctions between cladding welds and base welds and between cladding welds and base steel plates. 3.2.2 Weld metal between different steel grades
3.2.2.1 The weld metal between carbon steel and low alloy steel with different strength steel grades should ensure mechanical properties, and its tensile strength should not Exceeds the upper limit specified by the standard for higher-strength base materials. 3.2.2.2 The weld metal between austenitic high alloy steel and carbon steel or low alloy steel should ensure crack resistance and mechanical properties. It is advisable to use welding materials with a higher chromium and nickel content than the austenitic high-alloy steel base metal. 3.3 Welding materials should have product quality certificates and comply with corresponding standards. The welding unit shall conduct acceptance and re-inspection in accordance with the provisions of the quality assurance system, and shall only be used after passing the inspection.
3.4 ??Welding materials should meet the technical requirements of the drawings and pass the welding process qualification in accordance with JB4708. 3.5 The sulfur and phosphorus content of the deposited metal in the welding material should be consistent with that of the base material. The welding rod specified in the GB/T5118 standard should be selected and should also meet the following requirements:
3.5.1 Model E××××-G The welding rod should specify the Charpy V-notch impact absorbed energy of the weld metal. 3.5.2 The Charpy V-notch impact absorbed energy of the weld metal of the chromium-wrapped steel electrode should not be less than 31J at room temperature. 3.5.3 The Charpy V-notch impact absorbed energy of the weld metal of nickel steel electrodes used for welding low-temperature steels should not be less than 34 J at corresponding low temperatures.
3.6 The recommended welding materials for commonly used steel grades are shown in Table 1. The classification and grouping of commonly used steel grades are shown in Table 2. The recommended welding materials for welding different steel grades are shown in Table 3.
4 Welding process qualification and welders
4.1 The welding process for welding the following types of welds must be qualified according to JB4708 standards. a) Welds of pressure components;
b) Welds welded to pressure components;
c) Positioning welds melted into permanent welds; d) Base metal of pressure components Surface surfacing and repair welding; e) Repair welds of the above welds.
4.2 Welders who weld the following types of welds must pass the examination in accordance with the "Boiler and Pressure Vessel Welder Examination Rules". a) Welds of pressure components;
b) Welds welded to pressure components
c) Positioning welds melted into permanent welds; d) Surface of base metal of pressure components Corrosion resistant surfacing. 5Preparation before welding
5.1 Welding groove
The welding groove should be standard groove or designed by ourselves according to the drawing requirements or process conditions. The following factors should be considered when selecting the groove form and size:
a) Welding method:
b) Minimize the filler metal in the weld;
c) Avoid defects; ||tt| |d) Reduce residual welding deformation and stress:
e) Conducive to welding protection;
f) Easy operation for welders:
g) The groove of the composite steel plate should be conducive to reducing transition Dilution rate of weld metal. 39
JB/T4709—2000
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