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Flux-cored wire for oil and gas transfer pipeline and preparation method thereof

A technology for transportation pipelines and oil and gas, which is applied in the field of flux-cored welding wire and its preparation for oil and gas transportation pipelines. Contributing to slag forming and covering performance, and improving stability

Active Publication Date: 2020-02-14
GUILIN UNIV OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the flux-cored welding wires for oil and gas pipelines are mainly imported from abroad. The domestically produced flux-cored welding wires in my country still have unreasonable composition design, and the welded joints still need to be improved in terms of low-temperature toughness, low-temperature impact value instability and strength.

Method used

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  • Flux-cored wire for oil and gas transfer pipeline and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Flux-cored welding wire for oil and gas transmission pipelines is composed of a flux core and a low-carbon steel strip wrapped around the flux core. The flux core accounts for 12% of the total weight of the flux-cored welding wire for oil and gas transmission pipelines. Redstone powder 5%, nickel powder 3%, zirconium powder 3%, white corundum powder 1%, yttrium trioxide 1%, manganese silicon alloy powder 2%, chromium ferroalloy powder 1%, magnesium oxide powder 1%, molybdenum ferroalloy powder 0.5%, tungsten carbide powder 0.5%, rare earth fluoride 0.5%, cerium oxide 0.1%, and the balance is iron powder. The sum of the mass percentages of the above components is 100%, and the silicon-manganese ratio in the manganese-silicon alloy powder is 30%. : 70; the chromium content in the ferrochrome alloy powder is 30wt%; the molybdenum content in the ferromolybdenum alloy powder is 50wt%.

[0026] The preparation method of flux-cored welding wire for oil and gas pipelines is as ...

Embodiment 2

[0030] Flux-cored welding wire for oil and gas transmission pipelines is composed of a flux core and a low-carbon steel strip wrapped around the flux core. The flux core accounts for 15% of the total weight of the flux-cored welding wire for oil and gas transmission pipelines. Redstone powder 6%, nickel powder 4%, zirconium powder 4%, white corundum powder 2%, yttrium trioxide 2%, manganese silicon alloy powder 3%, chromium ferroalloy powder 3%, magnesium oxide powder 2%, molybdenum ferroalloy powder 1%, tungsten carbide powder 1%, rare earth fluoride 1%, cerium oxide 0.2%, and iron powder as the balance, the sum of the above components by mass percentage is 100%, and the silicon-manganese ratio in the manganese-silicon alloy powder is 30% : 70; the chromium content in the ferrochromium alloy powder is 35wt%; the molybdenum content in the ferromolybdenum alloy powder is 55wt%.

[0031] The preparation method of flux-cored welding wire for oil and gas pipelines is as follows: ...

Embodiment 3

[0035] Flux-cored welding wire for oil and gas pipelines consists of a flux core and a low-carbon steel strip wrapped around the core. The flux core accounts for 20% of the total weight of the flux-cored wire for oil and gas pipelines. The flux core contains the following components in mass percentage: Redstone powder 10%, nickel powder 6%, zirconium powder 6%, white corundum powder 4%, yttrium trioxide 3%, manganese silicon alloy powder 5%, chromium ferroalloy powder 5%, magnesium oxide powder 4%, molybdenum ferroalloy powder 2%, tungsten carbide powder 2%, rare earth fluoride 2%, cerium oxide 0.5%, and the balance is iron powder. The sum of the mass percentages of the above components is 100%, and the silicon-manganese ratio in the manganese-silicon alloy powder is 30%. : 70; the chromium content in the ferrochromium alloy powder is 35wt%; the molybdenum content in the ferromolybdenum alloy powder is 55wt%.

[0036] The preparation method of flux-cored welding wire for oil a...

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Abstract

The invention relates to a flux-cored wire for an oil and gas transfer pipeline and a preparation method thereof. The flux-cored wire is characterized by being composed of a flux core and a low carbonsteel band wrapping the flux core, wherein the weight of the flux core accounts for 12-20% of the total weight of the flux-cored wire for the oil and gas transfer pipeline, the flux core comprises, by mass, 5-10% of rutile powder, 3-6% of nickel powder, 3-6% of zirconium powder, 1-4% of white corundum powder, 1-3% of yttria, 2-5% of manganese-silicon alloy powder, 1-5% of ferrochrome powder, 1-4%of magnesia powder, 0.5-2% of ferro-molybdenum alloy powder, 0.5-2% of tungsten carbide powder, 0.5-2% of rare earth fluoride, 0.1-0.5% of ceric oxide and the balance iron powder, and the sum of themass percentages of all the components is 100%. The flux-cored wire for the oil and gas transfer pipeline has the advantages that the welded joint appearance is attractive, deslagging is facilitated,little spatter is caused and an electric arc is stable, and welded joint structure alloy is excellent in low-temperature toughness, low-temperature impact resistance and strength.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a flux-cored welding wire for oil and gas transmission pipelines and a preparation method thereof. Background technique [0002] With the rapid development of social economy, there are more and more long-distance oil and natural gas pipeline construction projects in my country, including the first line of West-East Gas Pipeline, Sichuan-East Gas Pipeline, Second West-East Gas Pipeline, and Third West-East Gas Pipeline. The diameter of the pipeline in the project is getting bigger and bigger, and the grade of steel is getting higher and higher. In order to meet the growing demand for natural gas, natural gas pipelines are developing towards long-distance, high-pressure, and large-caliber directions, and the strength level of steel used for pipelines is also increasing. In addition to X70 and X80 steel, X90 and other higher-level steel The application prospect of pipeline steel in ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/12B23K35/40
CPCB23K35/0266B23K35/3053B23K35/406
Inventor 刘运强叶东郑利华
Owner GUILIN UNIV OF AEROSPACE TECH
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