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Submerged arc welding wire for high-strength grade pipeline steel resistant to carbon dioxide corrosion

A carbon dioxide, high-strength technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of ineffective resistance to carbon dioxide corrosion, corrosion of steel materials, failure of pipeline equipment, etc., to prevent the further development of corrosion, Effects of improving quality and preventing thermal cracks

Inactive Publication Date: 2015-09-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Carbon dioxide flooding is one of the main and effective methods to enhance the recovery of low-permeability oilfields. However, the coexistence of carbon dioxide and water is extremely corrosive, causing steel Material corrodes rapidly, leading to early failure of plumbing equipment
Another example is "low carbon microalloyed submerged arc welding wire" (ZL92105621.4), "high performance pipeline steel submerged arc welding wire" (ZL01106520.6), "high grade pipeline steel submerged arc welding wire material" (ZL 200410073353.0) Although the patented technology is also suitable for submerged arc welding of oil and gas pipeline X80, it also has good H2S corrosion resistance, but based on CO2 and H sub>2S has a different corrosion mechanism to metal materials, but these welding wires cannot effectively resist carbon dioxide corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A carbon dioxide corrosion-resistant high-strength pipeline steel submerged arc welding wire. The chemical composition of the submerged arc welding wire for high-strength grade pipeline steel is: C is 0.02~0.03wt%, Si is 0.30~0.40wt%, Mn is 1.20~1.40wt%, Cr is 7.00~8.00wt% , Cu is 0.20~0.30wt%; (V+Ti+B) is 0.04~0.05wt%; S≤0.001wt%, P≤0.002wt%, and the balance is Fe and unavoidable impurities.

[0017] The submerged arc welding wire for high-strength pipeline steel prepared in this example adopts the three-wire submerged arc welding method, and the matching flux is SJ101-G, and the high-strength pipeline steel X80 steel plate with carbon dioxide corrosion resistance and a welding thickness of 12mm is used. . The chemical composition of the steel plate is: C is 0.01~0.05wt%, Si is 0.10~0.20wt%, Mn is 1.20~1.70wt%, Cr is 3.50~6.20wt%, Nb is 0.05~0.10wt%, Ti is 0.005~0.015wt%, S≤0.001wt%, P≤0.010wt%, the balance is Fe and unavoidable impurities; the mechanical properties ...

Embodiment 2

[0021] A carbon dioxide corrosion-resistant high-strength pipeline steel submerged arc welding wire. The chemical composition of the submerged arc welding wire for high-strength grade pipeline steel is: C is 0.03~0.04wt%, Si is 0.30~0.40wt%, Mn is 1.40~1.60wt%, Cr is 5.50~7.00wt% , Cu is 0.20~0.30wt%; (V+Ti+B) is 0.05~0.07wt%; S≤0.001wt%, P≤0.002wt%, and the balance is Fe and unavoidable impurities.

[0022] The welding process of the submerged arc welding wire for high-strength grade pipeline steel prepared in this example, the welded steel plate and the corrosion performance test are the same as those in Example 1.

[0023] Microstructural analysis, mechanical properties and corrosion performance tests were performed on the weld metal of the submerged arc welding wire for high-strength grade pipeline steel prepared in this embodiment. The test results are as follows: the weld metal structure is mainly low-carbon bainite, and there is a small amount of acicular ferrite + a v...

Embodiment 3

[0025]A carbon dioxide corrosion-resistant high-strength pipeline steel submerged arc welding wire. The chemical composition of the submerged arc welding wire for high-strength grade pipeline steel is: C is 0.04~0.05wt%, Si is 0.20~0.30wt%, Mn is 1.60~1.80wt%, Cr is 4.00~5.50wt% , Cu is 0.30~0.40wt%; (V+Ti+B) is 0.07~0.08wt%; S≤0.001wt%, P≤0.002wt%, and the balance is Fe and unavoidable impurities.

[0026] The welding process of the submerged arc welding wire for high-strength grade pipeline steel prepared in this example, the welded steel plate and the corrosion performance test are the same as those in Example 1.

[0027] Microstructural analysis, mechanical properties and corrosion performance tests were performed on the weld metal of the submerged arc welding wire for high-strength grade pipeline steel prepared in this embodiment. The test results are as follows: the weld metal structure is mainly low-carbon bainite and a small amount of acicular ferrite + very small amo...

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Abstract

The invention relates particularly to a submerged-arc welding wire for CO2 (Carbon Dioxide) corrosion resistant high-strength pipeline steel. The technical scheme is that the submerged-arc welding wire for the high-strength pipeline steel comprises the following chemical components: 0.02-0.06 wt% of C, 0.20-0.40 wt% of Si, 1.20-2.00wt% of Mn, 3.00-8.00wt% of Cr, and 0.20-0.40wt% of Cu, 0.04-0.10 wt% of (V+Ti+B), not more than 0.001 wt% of S, not more than 0.002 wt% of P, and the remain of Fe and inevitable impurities. The submerged-arc welding wire for the high-strength pipeline steel provided by the invention is matched with an SJ101-G soldering flux for use, requirements of intensity, tenacity and CO2 corrosion resistance of a welding joint formed by the welded submerged-arc welding wire for the CO2 corrosion resistant high-strength pipeline steel can be met by mechanical property and corrosion resistance of formed weld metal; moreover, the property of the welding joint is matched with base metal, so that technical requirements of oil and gas pipelines prepared by welding can be met; and the welding joint is good in CO2 corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of submerged arc welding wire. In particular, the invention relates to a carbon dioxide corrosion-resistant high-strength pipeline steel submerged arc welding wire. Background technique [0002] Carbon dioxide flooding is one of the main and effective methods to improve the recovery of low-permeability oilfields. However, the coexistence of carbon dioxide and water is extremely corrosive, causing rapid corrosion of steel materials and early failure of pipeline equipment. Implementation of CO in the Little Creek Oilfield in the United States 2 During the oil displacement test, the tubing wall was corroded and perforated in less than 5 months, and the corrosion rate was as high as 12.7mm / a. In the past ten years, with the further development of oil and gas wells in strong corrosive environments in my country, the continuous rise of strong corrosive atmospheres such as carbon dioxide at the bottom of wells an...

Claims

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Application Information

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