Technical requirements for ultra-clean low carbon steel

A low-carbon steel technology with technical requirements, applied in the field of low-carbon steel, can solve the problems of welding heat effect, aggravate the aging of steel, reduce the cold workability of steel, etc., to improve purity, increase cold workability, aluminum oxide inclusion the effect of reducing

Inactive Publication Date: 2014-12-03
JIANGSU HAIWEI GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1), increase the aging of steel;
[0006] (2), reduce the cold working performance of steel;
[0007] (3), causing the welding heat-affected zone to be brittle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A technical requirement for ultra-clean low-carbon steel, including the following steps:

[0024] (1) The high-temperature arc zone of the electric furnace steelmaking is easy to absorb nitrogen, the temperature is 330°, and the nitrogen content of the scrap raw material is a congenital defect;

[0025] (2) Under the condition of high chromium, the solubility of N in molten steel is extremely high, and the denitrification of molten steel in the production of low-nitrogen steel is extremely difficult due to the limitation of diffusion speed;

[0026] (3) Vacuum powder spraying denitrification, continued denitrification has no effect. In converter, electric furnace oxidation period, VOD, AOD decarburization at the same time, denitrification is very obvious, the relationship formula between denitrogenation speed and decarburization speed in converter decarburization process, due to oxygen blowing decarburization, a large amount of CO is produced, and CO bubbles are harmfu...

Embodiment 2

[0030] A technical requirement for ultra-clean low-carbon steel, including the following steps:

[0031] (1) The high-temperature arc zone of the electric furnace steelmaking is easy to absorb nitrogen, the temperature is 430°, and the nitrogen content of the scrap raw material is a congenital defect;

[0032] (2) Under the condition of high chromium, the solubility of N in molten steel is extremely high, and the denitrification of molten steel in the production of low-nitrogen steel is extremely difficult due to the limitation of diffusion speed;

[0033] (3) Vacuum powder spraying denitrification, continued denitrification has no effect. In converter, electric furnace oxidation period, VOD, AOD decarburization at the same time, denitrification is very obvious, the relationship formula between denitrogenation speed and decarburization speed in converter decarburization process, due to oxygen blowing decarburization, a large amount of CO is produced, and CO bubbles are harmfu...

Embodiment 3

[0037] A technical requirement for ultra-clean low-carbon steel, including the following steps:

[0038] (1) The high-temperature arc zone of the electric furnace steelmaking is easy to absorb nitrogen, the temperature is 510°, and the nitrogen content of the scrap raw material is a congenital defect;

[0039](2) Under the condition of high chromium, the solubility of N in molten steel is extremely high, and the denitrification of molten steel in the production of low-nitrogen steel is extremely difficult due to the limitation of diffusion speed;

[0040] (3) Vacuum powder spraying denitrification, continued denitrification has no effect. In converter, electric furnace oxidation period, VOD, AOD decarburization at the same time, denitrification is very obvious. The formula for the relationship between denitrification speed and decarburization speed in the decarburization process of converter, due to oxygen blowing decarburization, produces a large amount of CO, and CO bubbles ...

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PUM

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Abstract

The invention discloses technical requirements for super cleanness and low carbon steel. The technical requirements comprise the following steps: a high temperature electric arc region in electric steelmaking absorbs nitrogen easily, and the temperature ranges from 330 DEG C to 510 DEG C; under a high chrome condition, the N solubility of molten steel is extremely high, and in the technology for producing low-nitrogen steel, molten steel denitrification is difficulty and limited by diffusion rate; during vacuum powder injection denitrification, effects are not caused during continuous denitrification; during converting and electric furnace oxidation periods, as well as VOD and AOD decarburization, the denitrification is obvious, during a converter decarburization process, a formula for the relation of a denitrification speed and a decarburization speed exists, since oxygen blowing decarburization is performed, a great amount of CO is produced, and for nitrogen, CO bubbles serve as small vacuum chambers, so that the nitrogen can be carried away; for high-purity ferrite stainless steel, a VCR (vacuum refining furnace) is adopted for smelting, so that a converter is adopted for steelmaking to the low-nitrogen steel, nitrogen absorption is prevented during tapping, secondary refining and continuous casting processes, through the strict technical requirements provided by the invention, cold processing performance of ultra-clean low-carbon steel is enhanced greatly, and a crisp welding heat-affected zone cannot be caused.

Description

technical field [0001] The invention relates to the technical requirements of low-carbon steel, in particular to the technical requirements of ultra-clean low-carbon steel. Background technique [0002] When the purity of the material reaches a certain level, some mutations will occur in its properties. For example, the acid corrosion resistance of ultra-pure iron w[Fe]>99199 is equivalent to that of gold or platinum; w[P] in 18Cr2NiMo stainless steel is from When 0 1 026% is reduced to 01002%, its nitric acid corrosion resistance is increased by more than 100 times; the processing performance, fatigue performance and toughness of metal materials are mainly determined by the nature, size and quantity of non-metallic inclusions in the material; When the size of metal inclusions is less than 1 μm, and the number of them is so small that the distance between each other is greater than 10 μm, they will not affect the macroscopic properties of the material; in order to study t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/068C21C7/06C21C7/10
CPCY02P10/20
Inventor 张跃进
Owner JIANGSU HAIWEI GROUP
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