Welding process for longitudinal weld joints of submerged-arc welding for high-strength pipeline steel

A welding process, submerged arc welding technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., to achieve good impact toughness, excellent comprehensive mechanical properties, good forming effect

Active Publication Date: 2012-03-21
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the current welding of high-strength pipeline steel X120, there is no welding process for reference

Method used

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  • Welding process for longitudinal weld joints of submerged-arc welding for high-strength pipeline steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment is a welding process for submerged arc welding longitudinal welds of high-strength pipeline steel. (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.04%, Si: 0.08%, Mn: 1.90%, Nb+V+ Ti+Zr: 0.09%, Mo: 0.2%, Ni+Cr+Cu: 0.8%, P: 0.004%, S: 0.001%, the balance is Fe and unavoidable impurities; steel carbon equivalent Ceq: 0.53%, Pcm: 0.22%;

[0019] (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities; the wire diameter is 4mm, and the selected flux grade is OK Flux 10.62; The baking system is 350℃×2h;

[0020] (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer t...

Embodiment 2

[0023] This embodiment is a welding process for submerged arc welding longitudinal welds of high-strength pipeline steel. (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.05%, Si: 0.09%, Mn: 1.80%, Nb+V+ Ti+Zr: 0.095%, Mo: 0.3%, Ni+Cr+Cu: 1.0%, P: 0.003%, S: 0.0009%, the balance is Fe and unavoidable impurities; steel carbon equivalent Ceq: 0.50%, Pcm: 0.21%;

[0024] (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities; the wire diameter is 4mm, and the selected flux grade is OK Flux 10.62; The baking system is 350℃×2h;

[0025] (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer...

Embodiment 3

[0028] This embodiment is a welding process of high-strength pipeline steel submerged arc welding longitudinal weld. (1) The chemical composition and weight percentage of high-strength pipeline steel are: C: 0.06%, Si: 0.10%, Mn: 1.60%, Nb+V+ Ti+Zr: 0.10%, Mo: 0.4%, Ni+Cr+Cu: 1.2%, P: 0.002%, S: 0.0005%, the balance is Fe and unavoidable impurities; steel carbon equivalent Ceq: 0.51%, Pcm: 0.21%;

[0029] (2) The chemical composition and weight percentage of the welding wire used are: C: 0.08%, Mn: 1.75%, Si: 0.80%, S: 0.003%, P: 0.010%, Cu: 0.138%, Cr: 0.41%, Mo: 0.53% , Ni: 2.22%, Al: 0.011%, Ti: 0.05%, V: 0.015, Zr<0.01%, the balance is Fe and unavoidable impurities; the wire diameter is 4mm, and the selected flux grade is OK Flux 10.62; The baking system is 350℃×2h;

[0030] (3) Submerged arc welding adopts X-shaped groove, the groove angle is 90°, and the blunt edge is 4.8mm. It is welded at room temperature, without preheating, and does not control the interlayer tempe...

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Abstract

The invention belongs to the technical field of welding of high-strength pipeline steel, and relates to a welding process for longitudinal weld joints of submerged-arc welding for high-strength pipeline steel. Chemical components of high-strength pipeline steel comprise 0.04%-0.06% of C, 0.08%-0.10% of Si, 1.2%-2.0% of Mn, 0.09%-0.10% of Nb+V+Ti+Zr, 0.2%-0.4% of Mo, 0.8%-1.2% of Ni+Cr+Cu, P equal to or less than 0.004%, S equal to or less than 0.001% and the balance being Fe. Steel comprises carbon equivalent Ceq equal to or less than 0.53% and Pcm equal to or less than 0.22%. Chemical components of welding wires comprise 0.08% of C, 1.75% of Mn, 0.80% of Si, 0.003% of S, 0.010% of P, 0.138% of Cu, 0.41% of Cr, 0.53% of Mo, 2.22% of Ni, 0.011% of Al, 0.05% of Ti, 0.015% of V, 0,01% of Zr, and the balance being Fe. An X-shaped groove is utilized for the submerged-arc welding, the angle of the groove is 90 degrees, the truncated edge is 4.8mm, the heat input in welding is 21kj / cm, the welding current ranges from 450-800A, the arc voltage ranges from 32V to 38V, and the welding speed is 170cm / min. Preheating before welding, heat treatment after welding, interlayer temperature control are all eliminated, weld joints have excellent comprehensive performances, and various areas of the weld joints have fine impact ductility reserve and safety allowance.

Description

technical field [0001] The invention belongs to the technical field of high-strength pipeline steel welding, in particular to a welding process of submerged arc welding longitudinal seam of high-strength pipeline steel, and relates to a welding process of high-strength pipeline steel X120 submerged arc welding longitudinal seam welding process. Background technique [0002] The pipeline steel used to transport oil and gas has been put into use since the 1970s, X65, X70 steel was introduced into engineering construction in the 1980s, and X80 steel pipes were produced in the late 1990s. Until now, the strength of X100 and X120 steels has gradually developed. to above 1000MPa. The use of high-strength and ultra-high-strength pipeline steel can not only reduce the cost of building high-pressure gas pipelines, but also improve the efficiency of natural gas transmission and save operating costs. It is the current and future development requirements and trends of pipeline steel, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K35/30B23K9/23
Inventor 尹雨群赵晋斌王红鸿吴开明雷玄威
Owner NANJING IRON & STEEL CO LTD
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