Submerged arc welding wire used for pipeline steel of carbon dioxide corrosion resistant 65 ksi strength grade

A 65ksi, carbon dioxide technology, used in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problem of not being able to effectively resist carbon dioxide corrosion, achieve low cost, avoid the reduction of corrosion resistance, and be easy to control.

Inactive Publication Date: 2013-05-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as "low-carbon micro-alloyed submerged arc welding wire" (ZL92105621.4), "high-performance pipeline steel submerged arc welding wire" (ZL 01106520.6) and "high-grade pipeline steel submerged arc welding wire material" (ZL 200410073353.0) patented technology , suitable for submerged arc welding of oil and gas pipeline X60-X80, also has good H2S corrosion resistance, but can not effectively resist carbon dioxide corrosion, the reason is CO2 Sub> and H2S have different corrosion mechanisms for metal materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A carbon dioxide corrosion-resistant submerged arc welding wire for 65ksi strength grade pipeline steel, the chemical composition of the submerged arc welding wire is: C is 0.001~0.01wt%, Mn is 0.70~0.80wt%, Si is 0.10~0.20wt% %, Cr is 5.50~6.00wt%, Cu is 0.20~0.30wt%, (V+Nb+Ti) is 0.04~0.05wt%, S≤0.001wt%, P≤0.002wt%, the balance is Fe and not Avoid impurities.

[0017] The submerged arc welding wire prepared in this embodiment adopts the three-wire submerged arc welding method, and the matching flux is SJ101-G, and welds a 12 mm thick carbon dioxide corrosion-resistant X65 steel plate. The chemical composition of the steel plate is: C is 0.01~0.05wt%, Si is 0.20~0.70wt%, Mn is 0.20~0.70wt%, Cu is 0.20~0.50wt%, Ni is 0.10~0.30wt%, Cr is 3.50~6.20wt%, S≤0.001wt%, P≤0.010wt%, others are iron and unavoidable impurities. The mechanical properties of the steel plate are: the yield strength is ≥350MPa, the tensile strength is 540~600MPa, and the average impact toughness wo...

Embodiment 2

[0021] A carbon dioxide corrosion-resistant submerged arc welding wire for 65ksi strength grade pipeline steel, the chemical composition of the submerged arc welding wire is: C is 0.01~0.02wt%, Mn is 0.60~0.70wt%, Si is 0.10~0.20wt% %, Cr is 4.50~5.50wt%, Cu is 0.20~0.30wt%, (V+Nb+Ti) is 0.05~0.07wt%, S≤0.001wt%, P≤0.002wt%, the balance is Fe and not Avoid impurities.

[0022] The welding process of the submerged arc welding wire prepared in this embodiment, the steel plate to be welded, and the corrosion performance test are the same as those in Embodiment 1.

[0023] The microstructure analysis, mechanical properties and corrosion performance tests of the weld metal of the submerged arc welding wire prepared in this example were carried out, and the results are as follows: the weld metal structure is low-carbon bainite + a small amount of low-carbon martensite. The tensile strength of the weld metal is 574MPa, and the average value of the impact energy of the weld metal at ...

Embodiment 3

[0025] A carbon dioxide corrosion-resistant submerged arc welding wire for 65ksi strength grade pipeline steel, the chemical composition of the submerged arc welding wire is: C is 0.02~0.03wt%, Mn is 0.50~0.60wt%, Si is 0.20~0.40wt% %, Cr is 3.50~4.50wt%, Cu is 0.30~0.40wt%, (V+Nb+Ti) is 0.07~0.08wt%, S≤0.001wt%, P≤0.002wt%, the balance is Fe and not Avoid impurities.

[0026] The welding process of the submerged arc welding wire prepared in this embodiment, the steel plate to be welded, and the corrosion performance test are the same as those in Embodiment 1.

[0027] Microstructural analysis, mechanical properties and corrosion performance tests were performed on the weld metal of the submerged arc welding wire prepared in this embodiment. The results are as follows: the weld metal structure is low carbon bainite + a small amount of low carbon martensite. The tensile strength of the weld metal is 550MPa, and the average value of the impact energy of the weld metal at -20°C...

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Abstract

The invention relates to a submerged arc welding wire used for pipeline steel of a carbon dioxide corrosion resistant 65 ksi strength grade. The technical scheme of the submerged arc welding wire used for the pipeline steel of the carbon dioxide corrosion resistant 65 ksi strength grade is that chemical constituents of the submerged arc welding wire is: carbon (C) is 0.001-0.05 wt%, manganese (Mn) is 0.40-0.80 wt%, silicon (Si) is 0.10-0.30 wt%, chromium (Cr) is 3.00-6.00 wt%, copper (Cu) is 0.20-0.40 wt%, (vanadium+ niobium+ titanium) is 0.04-0.10 wt%, sulphur (S) is less than or equal to -0.001 wt%, phosphorus (P) is less than or equal to 0.002 wt%, and the balance are ferrum (Fe) and inevitable impurities. Elements of an alloy are simple, the prepared submerged arc welding wire is matched with welding flux SJ 101, mechanical property and corrosion resistant property of formed welding metal are matched with the property of the pipeline steel of the carbon dioxide corrosion resistant 65 ksi strength grade, and the technical requirement of welding prepared oil and gas pipelines can be met, and the submerged arc welding wire used for the pipeline steel of the carbon dioxide corrosion resistant 65 ksi strength grade has good corrosion resistant property.

Description

technical field [0001] The invention belongs to the technical field of submerged arc welding wire. In particular, the invention relates to a submerged arc welding wire for pipeline steel with 65ksi strength level resistant to carbon dioxide corrosion. Background technique [0002] The miscibility of carbon dioxide and crude oil can significantly reduce the viscosity of crude oil and increase its fluidity. Taking advantage of this feature, carbon dioxide is widely used in the extraction of crude oil in oil and gas fields to effectively increase the yield of crude oil. However, once carbon dioxide coexists with water, it is extremely corrosive, and will severely corrode the pipeline materials used to transport crude oil, including pipeline steel and its welded joints. This puts forward performance requirements for pipeline steel and weld metal against carbon dioxide corrosion. With the development of oil wells in the middle and later stages, the water content and salinity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
Inventor 王红鸿吴开明
Owner WUHAN UNIV OF SCI & TECH
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