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Spiral welded pipe steel A139Gr.E with low yield ratio, and preparation method thereof

A low yield ratio, welded pipe steel technology, applied in the direction of improving process efficiency, can solve the problems of high cost of pipeline steel, high yield ratio, poor welding performance, etc., to achieve good welding performance, low yield ratio, improved The effect of welding performance

Inactive Publication Date: 2020-04-28
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a low yield ratio spiral welded pipe steel A139Gr.E and its preparation method to solve the problems of high cost, high yield ratio and poor welding performance of pipeline steel

Method used

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  • Spiral welded pipe steel A139Gr.E with low yield ratio, and preparation method thereof
  • Spiral welded pipe steel A139Gr.E with low yield ratio, and preparation method thereof
  • Spiral welded pipe steel A139Gr.E with low yield ratio, and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a preparation method of the above-mentioned low yield ratio spiral welded pipe steel A139Gr.E, comprising the following steps:

[0033] 1) Hot metal pretreatment

[0034] Pretreat the molten iron to ensure that the mass ratio of S in the molten iron is ≤0.003%, and the slag is removed before entering the converter;

[0035] 2) Converter smelting

[0036] Concentrated scrap steel and molten iron are used for smelting, and the converter pulls carbon once and hits to avoid spot blowing; high-manganese, ferrosilicon, and ferrochrome are used for tapping, and the ladle is purged with argon before tapping to control the tapping port and avoid scattered flow. The mass content of Als in the medium is controlled at 0.025~0.045%;

[0037] 3) LF refining

[0038] The LF treatment process maintains a slight positive pressure, and the amount of N increase is ≤5ppm; LF uses activated lime and fluorite to make reducing slag, controls the intensit...

Embodiment

[0047]Prepare low yield ratio spiral welded pipe steel A139Gr.E according to the following mass percentages: C: 0.08-0.20%, Si: 0.07-0.17%, Mn: 0.90-1.40%, S: 0.001-0.005%, P: 0.005-0.015% , Cr: 0.30~0.50%, Al: 0.015~0.055%, Ca: 0.0010~0.0050%, Nb: 0.005~0.055%, Ti: 0.005~0.055%, O: 0.0010~0.0030%, the rest is Fe and other unavoidable of impurities.

[0048] The preparation method is as follows:

[0049] 1) Hot metal pretreatment

[0050] Use fine scrap steel to pretreat the molten iron to ensure that the quality of S in the molten iron entering the furnace is ≤0.003%, and the slag is removed before entering the converter;

[0051] 2) Converter smelting

[0052] Concentrated scrap steel and molten iron are used for smelting, and the converter pulls carbon once and hits to avoid spot blowing; high-manganese, ferrosilicon, and ferrochrome are used for tapping, and the ladle is purged with argon before tapping to control the tapping port and avoid scattered flow. The mass con...

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Abstract

The invention discloses a spiral welded pipe steel A139Gr.E with low yield ratio and a preparation method thereof. The spiral welded pipe steel A139Gr.E with low yield ratio is compositely reinforcedby Cr, Nb and Ti to replace expensive alloys such as V, Mo and Ni, is low in cost and pure in molten steel, and can reduce the cost on the basis of ensuring excellent performance; on the aspect of mechanical property, each index meets the requirement, and the margin is sufficient; the steel has the advantages of high strength, good toughness, excellent forming performance, cold bending performanceand excellent welding performance while being low in yield ratio.

Description

technical field [0001] The invention relates to the technical field of steel preparation, and in particular provides a low yield ratio spiral welded pipe steel A139Gr.E and a preparation method thereof. Background technique [0002] With the development of the petroleum industry, pipeline steel requires high strength, good toughness, low yield ratio and good welding performance. At present, sufficient elements such as V, Mo and Ni are generally added to the steel to meet the requirements. Due to the high alloy cost , high yield ratio and poor welding performance have restricted the promotion of pipeline steel. It is urgent to adopt new processes and methods to replace the original precious alloys. On the premise of ensuring high strength and good plasticity, the yield ratio can be reduced and the steel can be improved. welding performance. Contents of the invention [0003] In view of this, the purpose of the present invention is to provide a low yield ratio spiral welded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C33/06C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/005C21D2211/009C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28Y02P10/20
Inventor 吴刚文小明韩宇苗隽王全洲陈红远崔宏涛徐勇
Owner BENGANG STEEL PLATES
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