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Anti-H2S-CO2-corrosion pipeline submerged arc welding wire

A technology of submerged arc welding wire and submerged arc welding, which is applied in the direction of arc welding equipment, welding/cutting medium/material, welding medium, etc., and can solve problems such as lack of CO corrosion resistance, corrosion failure of pipelines and equipment, and economic losses. Achieve excellent H2S and CO2 corrosion resistance, excellent H2S and CO2 corrosion resistance

Inactive Publication Date: 2017-05-24
HAINING RUIAO METAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pitting corrosion is the most serious situation, which causes corrosion failure of pipelines and equipment, and causes serious economic losses and social consequences
[0004] Prior art 201410685689.6 and 201510378577.0 disclose anti-H 2 Special submerged arc welding wire for S corrosion pipelines, suitable for submerged arc pipe making requirements of strength grade X65 / 70 pipelines, but does not have anti-CO 2 corrosion performance
201410682803.x discloses an anti-CO 2 The 5Cr-Ni-Mo welding wire for the pipeline is used under the conditions of current 100-180A and voltage 10-15V, and it cannot be used for submerged arc welding.
Anti-H 2 S and CO 2 Submerged arc welding wire required for double corrosion is rarely reported

Method used

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  • Anti-H2S-CO2-corrosion pipeline submerged arc welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A suitable for anti-H 2 S and CO 2 Corrosion pipeline submerged arc welding wire, its main chemical composition (weight percent): C 0.01, Si 0.05, Mn 0.3, P 0.004, S 0.002, Cr 3.6, Mo 1.2, Cu 0.3, the balance is iron and unavoidable impurities .

[0028] The specification of the welding wire is 4.0mm in diameter, which is matched with welding RF60E and used for submerged arc butt joint test of 26mm thick steel plate X80. Four wire submerged arc welding is adopted, the welding heat input is 48kJ / cm, and the four wire currents are 600, 800, 800 and 1000A respectively. No defects were found in post-weld ultrasonic, magnetic particle inspection, and X-ray inspections. The mechanical properties of the welded joints are listed in Table 1.

Embodiment 2

[0030] A suitable for anti-H 2 S and CO 2 Corrosion pipeline submerged arc welding wire, its main chemical composition (weight percent): C 0.015, Si 0.08, Mn 0.4, P 0.0045, S 0.0015, Cr 3.3, Mo 0.9, Cu 0.25, the balance is iron and unavoidable impurities .

[0031] The specification of the welding wire is 4.0mm in diameter, which is matched with welding RF60E and used for submerged arc butt joint test of 20mm thick steel plate X80. Single-wire multi-layer multi-pass welding is adopted, the welding heat input is 50kJ / cm, and the current is 750A. No defects were found in post-weld ultrasonic, magnetic particle inspection, and X-ray inspections. The mechanical properties of the welded joints are listed in Table 1.

Embodiment 3

[0033] A suitable for anti-H 2 S and CO 2 Submerged arc welding wire for corroding pipelines, its main chemical composition (weight percentage): C 0.01, Si 0.04, Mn 0.2, P 0.003, S 0.001, Cr 2.1, Mo 1.0, Cu 0.30, the balance is iron and unavoidable impurities .

[0034] The welding wire specification is 3.2mm in diameter, which is matched with welding RF60E and used for submerged arc butt joint test of 26mm thick steel plate X70. Double-sided, double-wire welding is adopted, the welding heat input is 60kJ / cm, and the current is 500 and 650A respectively. No defects were found in post-weld ultrasonic, magnetic particle inspection, and X-ray inspections. The mechanical properties of the welded joints are listed in Table 1.

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Abstract

The invention discloses an anti-H2S-CO2-corrosion pipeline submerged arc welding wire. The welding wire is composed of, by weight, less than or equal to 0.02% of C, less than 0.1% of Si, 0.1%-0.5% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, 2.0%-4.0% of Cr, 0.9%-1.5% of Mo, 0.25%-0.45% of Cu, and the balance Fe and inevitable impurities. The welding wire matches up with a special welding flux and can be suitable for manufacturing anti-corrosion pipelines with the steel grade being X65, X70, X80 and the like in a submerged arc welding mode; and manufactured welded joints meet mechanical property requirements, and the anti-H2S-CO2-corrosion performance of the welded joints is better than that of parent metal.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a submerged arc welding wire, in particular to a 2 S and CO 2 Submerged arc welding wire for corroding pipelines. Background technique [0002] About 1 / 3 of oil and gas fields in my country contain H 2 S. h 2 S corrosion can lead to hydrogen-induced cracking and sulfide stress cracking of mining equipment and pipelines, which directly limits the safety and life of mining and pipelines. [0003] With the exploitation of deep oil and gas fields and the injection of CO into oil fields 2 Application of enhanced extraction processes, CO 2 Corrosion is also getting worse. CO 2 In aqueous medium, it can cause rapid general corrosion and severe local corrosion of steel, CO 2 Corrosion is typically characterized by localized pitting, ringworm, and mesa corrosion. Pitting corrosion is the most serious situation, which causes corrosion failure of pipelines and equipment, and causes se...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40B23K9/18
CPCB23K35/3053B23K9/18B23K35/40
Inventor 李晶
Owner HAINING RUIAO METAL TECH CO LTD
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