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High-strength steel oil gas pipeline special-purpose welding stick

A high-strength, welding wire technology, used in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of insufficient welding strength and cold cracking of welds, and achieve the prevention of cold cracking phenomenon, grain refinement, etc. Achieve the effect of microalloying

Inactive Publication Date: 2008-08-13
金秋生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When welding with low-grade welding wire, the welding strength of the weld is not enough; while welding with high-grade welding wire, cold cracks will occur when the welding strength of the weld is high enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The steel with both S and P less than 0.015% by weight is selected for smelting welding wire steel, and there is no special requirement for the smelting process. During the smelting process, the following elements C: 0.10, Si: 0.60, Mn: 2.00, Cr: 0.80 are added by weight, and the balance is iron and its unavoidable impurities whose content is not more than 0.01% of iron. After being drawn into welding wire, the welding wire is copper-plated, and the amount of copper plating is 0.5% of the iron content in the welding wire.

Embodiment 2

[0020] The steel with both S and P less than 0.025% by weight is selected for smelting welding wire steel, and there is no special requirement for the smelting process. During the smelting process, the following elements C: 0.06, Si: 0.40, Mn: 1.50, Cr: 1.00 are added by weight, and the balance is iron and its unavoidable impurities whose content is not more than 0.02% of iron. After being drawn into welding wire, the welding wire is copper-plated, and the amount of copper plating is 0.3 percent of the iron content in the welding wire.

Embodiment 3

[0022] The steel with both S and P less than 0.015% by weight is selected for smelting welding wire steel, and there is no special requirement for the smelting process. During the smelting process, the following elements C: 0.08, Si: 1.00, Mn: 1.80, Cr: 0.90 are added by weight, and the balance is iron and its unavoidable impurities whose content is not more than 0.05% of iron. After being drawn into welding wire, the welding wire is copper-plated, and the amount of copper plating is 0.35% of the iron content in the welding wire.

[0023] The above are special welding wires for high-strength steel oil and gas pipelines composed of C, Si, Mn, Cr and copper elements. Since an appropriate amount of chromium is added to the common welding wire composed of C, Si and Mn, the welding strength of the welding wire is improved.

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PUM

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Abstract

The invention pertains to welding wire technique field, disclosing an exclusive welding wire for welding high-strength steel oil gas conduit. The technique project is that the welding wire comprises elements with following percentage by weight: 0.06-0.10554364570f C, 0.40-1.00551375040f Si, 1.40-2.100f Mn, 0.06-1.000f Cr, less than of equal to 0.101f Nb, less than or equal to 0.104546100f B, less than or equal to 1.004546204f Ni, less than or equal to 1.0016764762631f S, less than or equal to 1.0016647331716f P, and residue percent of Fe or unavoidable impurity. The invented welding wire can realize welding of low welding crack sensibility steel oil gas conduit at -50 DEG C, microalloying is realized at the same time, and obdurability of welding joint is increased so that splash during welding and generation of welding joint cold check when welding by using replaced welding wires are reduced. Production cost of each ton by using the exclusive welding wires is reduced by more than 2500 yuan than using normal replacement welding wires, so great economic effectiveness is provided.

Description

technical field [0001] The invention belongs to the field of welding wire technology, and in particular relates to a special welding wire for high-strength steel oil and gas pipelines. Background technique [0002] Steel oil and gas pipelines are a type of steel that can be welded without cracks without preheating or low preheating. Since this type of steel is a new type of steel, there is no special welding wire specially used for welding this type of steel. , generally use other varieties of high-strength welding wire instead. When welding with low-grade welding wire, the welding strength of the weld is not enough; while welding with high-grade welding wire, when the welding strength of the weld is high enough, cold cracks will occur. Contents of the invention [0003] The purpose of the present invention is to provide a special welding wire that can be used exclusively for welding high-strength steel oil and gas pipelines. [0004] The technical scheme that realizes t...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 金秋生
Owner 金秋生
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