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Pipeline steel submerged arc welding wire for acid service environment

A service environment, pipeline steel technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of easy softening area in the heat-affected zone, less alloy elements, etc., and increase the ability of acid corrosion resistance , good acid corrosion resistance, and the effect of improving the ability to resist hydrogen-induced cracking

Active Publication Date: 2018-03-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
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Problems solved by technology

However, due to the low content of alloying elements, softening areas tend to appear in the heat-affected zone near the weld after welding with this patent

Method used

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  • Pipeline steel submerged arc welding wire for acid service environment
  • Pipeline steel submerged arc welding wire for acid service environment
  • Pipeline steel submerged arc welding wire for acid service environment

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specific Embodiment

[0040] According to the scope of the chemical composition of the present invention, electric furnaces are used to smelt 3 furnaces of welding wire steel, and after smelting, a Φ4mm welding wire is made by drawing and plating copper.

[0041] The chemical composition of the fabricated welding wire and the calculated carbon equivalent and P cm The values ​​are shown in Table 1.

[0042] Table 1 Chemical composition of test submerged arc welding wire

[0043] serial number

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Abstract

The invention discloses a pipeline steel submerged-arc welding wire for an acid service environment and an application of the pipeline steel submerged-arc welding wire, and belongs to the technical field of welding materials. The pipeline steel submerged-arc welding wire is made by smelting the following chemical compositions by mass percentage: 0.030%-0.060% of C, 0.50%-1.20% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.05%-0.30% of Si, 0.20%-0.50% of Cu, 0.30%-0.70% of Cr, 0.065%-0.10% of Nb, 0.10%-0.16% of Ti, less than or equal to 0.2% of Ni, 0.001%-0.003% of Mo, 0.006%-0.010% of B, and the balance of Fe. The tensile strength of the submerged-arc welding wire disclosed by the invention is 540 MPa to 600 MPa, the Vickers hardness value is less than or equal to 220 HV10, the Charpy impact toughness value of a welding line at -20 DEG C is greater than or equal to 90 J, and welding metal has good resistance to acid corrosion while having strength and toughness matched with parent metal.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to a submerged arc welding wire, in particular to a pipeline steel submerged arc welding wire for acid service environment. Background technique [0002] In order to meet the future oil and gas demand worldwide, the number of sour oil and gas wells has been developed greatly in recent years. The transported oil and gas have been purified before entering the long-distance pipeline, but if the oil and gas entering the pipeline cannot meet the requirements of drying and purification, the corrosion of the pipeline in the acidic environment is still inevitable. Therefore, the demand for pipeline steel used in acid service conditions for long-distance pipelines is increasing day by day. Submerged arc welding is the main process for manufacturing welded pipes, and it is also the most efficient welding method. [0003] Generally speaking, as the strength level increases, the proba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
CPCB23K35/3073
Inventor 胡美娟李炎华王海涛王鹏杨放池强
Owner BC P INC CHINA NAT PETROLEUM CORP
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