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A method for controlling edge cracking of boron-containing low-alloy steel

A low-alloy steel and edge cracking technology, which is applied in the control field of low-alloy steel smelting, can solve the problems of inability to eliminate defects, reduce B content and N content, etc., to prevent hot cracks and deformation, eliminate segregation, and improve qualification rate effect

Active Publication Date: 2016-01-06
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After retrieval, there are related documents such as analysis and improvement of edge cracks in SS400-B boron-containing hot-rolled steel coils, causes and control of edge cracks in boron-containing steels, and their common characteristics It is to reduce the B content and N content. At the same time, the secondary cooling water in the casting process adopts weak cooling, which can only reduce the occurrence rate and reduce the degree of defects, but cannot eliminate defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for controlling edge cracking of boron-containing low-alloy steel, the steps of which are:

[0021] 1) After the molten iron is desulfurized, it is smelted in a converter and argon blowing is adopted throughout the process, and the fume hood is not lifted during the whole smelting process; the carbon weight percentage at the end of smelting is controlled at 0.061%, the end point temperature is 1692°C, and no point blowing is used at the end point;

[0022] 2) Incomplete deoxidation from tapping to ladle: when the weight of tapping reaches 1 / 5 of the total weight of molten steel, add active lime according to 1.8kg / ton of steel, and control the oxygen content in molten steel to 296ppm;

[0023] 3) RH vacuum treatment: without oxygen blowing, the treatment time is 29 minutes; after the treatment is completed, carbon powder and ferroboron are routinely added according to the composition requirements of the steel to be made, and the boron weight percentage co...

Embodiment 2

[0028] A method for controlling edge cracking of boron-containing low-alloy steel, the steps of which are:

[0029] 1) After the molten iron is desulfurized, it is smelted in a converter and argon blowing is adopted throughout the process, and the fume hood is not lifted during the whole smelting process; the carbon weight percentage at the end of smelting is controlled at 0.068%, the end temperature is 1699°C, and no blowing is used at the end;

[0030] 2) Incomplete deoxidation from tapping to ladle: when the weight of tapping reaches 1 / 5 of the total weight of molten steel, add active lime according to 1.5kg / ton of steel, and control the oxygen content in molten steel to 291ppm;

[0031] 3) RH vacuum treatment: without oxygen blowing, the treatment time is 26 minutes; after the treatment is completed, carbon powder and ferroboron are routinely added according to the composition requirements of the steel to be made, and the boron weight percentage content in the molte...

Embodiment 3

[0036] A method for controlling edge cracking of boron-containing low-alloy steel, the steps of which are:

[0037] 1) After the molten iron is desulfurized, it is smelted in a converter and argon is blown throughout the process, and the fume hood is not lifted during the whole smelting process; the carbon weight percentage at the end of smelting is controlled at 0.068%, the end temperature is 1720°C, and no blowing is performed at the end;

[0038] 2) Incomplete deoxidation from tapping to ladle: when the weight of tapping reaches 1 / 5 of the total weight of molten steel, add active lime according to 2kg / ton of steel, and control the oxygen content in molten steel to 294ppm;

[0039] 3) RH vacuum treatment: without oxygen blowing, the treatment time is 23 minutes; after the treatment is completed, carbon powder and ferroboron are routinely added according to the composition requirements of the steel to be made, and the boron weight percentage content in the molten steel...

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PUM

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Abstract

A method for controlling edge cracking of boron-containing low-alloy steel: smelting in a converter and blowing argon throughout the process, without lifting the fume hood during smelting; tapping the steel to the ladle for incomplete deoxidation; performing RH vacuum treatment without oxygen blowing; During the casting process, the specific water volume of the secondary cooling section is controlled to not exceed 0.7 liters / kg of steel; the subsequent process is routinely carried out. The invention can eliminate the segregation phenomenon of B in the steel, prevent the occurrence and deformation of thermal cracks in the boron-containing steel, improve the pass rate, and does not need the flame cleaning of the finishing process or the angle cutting treatment of the cutting machine.

Description

technical field [0001] The invention relates to a control method in the smelting of low alloy steel, in particular to a method for controlling edge cracking of boron-containing low alloy steel. Background technique [0002] Boron (B) microalloying can coarsen grains and reduce yield strength. Boron has become an indispensable microalloying element for some high-quality steels. Boron is an element with strong crack sensitivity. During the continuous casting cooling process, boron in the steel will combine with nitrogen to form BN, which will precipitate and aggregate in the austenite intergranular, reducing the fluidity of the grain boundary and making the re- The crystallization temperature increases. Due to the hindered recrystallization, the grain boundary cannot migrate, and the stress is concentrated at the grain boundary and cannot be eliminated, which causes embrittlement of the grain boundary and intergranular fracture, reduces the thermoplasticity of the steel, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/072C21C7/10
Inventor 唐树平张余杨枝超李慕耘杨新泉
Owner 武汉钢铁有限公司
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