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Technique for desulfurization in refining process

A process method and refining process technology, applied in the field of desulfurization in the refining process, can solve problems such as unfavorable lime powder desulfurization effect, and achieve the effects of strong desulfurization ability, scientific and reasonable preparation, and improved utilization rate

Active Publication Date: 2010-09-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result is not conducive to the desulfurization effect of lime powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Transport the steel from the converter to the LF station for refining, temperature measurement and sampling, deoxidation and alloying, and deoxidation treatment by adding aluminum to reach α [O] ≤0.0003%, after the deoxidation is completed, stop argon blowing and stirring, and spray the combined powder; the conveying gas is Ar, the conveying pressure is controlled at 0.01-2.0MPa, the conveying rate of the combined powder is 0.01-3kg / s, and the feeding amount is 0.3-1.5 kg / t; stand still for 1 to 5 minutes after powder spraying, then lightly treat with argon blowing, the stirring intensity of argon gas is 0 to 0.004m 3 / (min·t), the argon blowing time is 0-5min, and the desulfurization treatment is completed. Moving out and pouring on the machine, the continuous casting adopts the whole process of protective pouring.

[0027] For the preparation of the combined powder, firstly, the low melting point pre-melted slag is prepared by taking 40kg of CaO, Al 2 o 3 35kg, Si...

Embodiment 2

[0029] Transport the steel from the converter to the RH station for refining, temperature measurement and sampling, deoxidation and alloying, and deoxidation treatment by adding aluminum to reach α [O] ≤0.0003%, after the deoxidation is completed, the combined powder is sprayed, and the delivery gas is Ar and CO 2 The mixed gas, the conveying pressure is controlled at 0.01-2.0MPa, the conveying rate of the combined powder is 0.01-3.5kg / s, the feeding amount is 0.3-1.8kg / t, the net cycle is 5min after powder spraying, the vacuum is broken after the cycle is over, and it is taken out , pouring on the machine, continuous casting adopts full protection pouring.

[0030] The preparation of combination powder, at first take CaO10kg, Al 2 o 3 50kg, SiO 2 5kg, MgO 5kg, CaF 230kg prepares low-melting point pre-melting slag, its method is the same as embodiment 1; Get its particle diameter again according to formula ratio and be that the prepared low-melting point pre-melting slag 1...

Embodiment 3

[0032] Transport the steel from the converter to the CAS-OB station for refining, temperature measurement and sampling, deoxidation and alloying, and deoxidation treatment by adding aluminum to reach α [O] ≤0.0003%, after the deoxidation is completed, the combined powder is sprayed, and the delivery gas is Ar and CO 2 One or two kinds of mixed gas, the delivery pressure is controlled at 0.01-1.5MPa, the delivery rate of the combined powder is 0.01-3.5kg / s, the feeding amount is 0.3-2kg / t, stand still for 10min after powder spraying, and then bottom Stir with argon blowing, the argon stirring intensity is 0~0.004m 3 / (min·t), the argon blowing time is 0~5min. Moved out, poured on the machine, continuous casting adopts full protection pouring.

[0033] The preparation of combination powder, at first take CaO70kg, Al 2 o 3 15kg, SiO 2 3kg, MgO 2kg, CaF 2 10kg prepares low-melting point pre-melted slag, its method is the same as embodiment 1; Get its particle diameter again ...

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Abstract

The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for desulphurization during the refining process, which is the preferred process method for the desulphurization during the refining processes of various microalloy steel or special steel. The process comprises the following steps of: a. deoxidation: molten steelis subjected to deoxidation treatment first to realize that alpha[O] is less than or equal to 0.0003 percent; b. the spraying of combined powder: the molten steel is refined at an LF, RH, VD or CAS-OB station, and a powder spraying process is adopted to spray the combined powder into the molten steel at the LF, RH, VD or CAS-OB station; and c. continuous casting: the continuous casting adopts thewhole-process protection casting. Proven by application, the process has strong desulphurization ability with a desulphurization rate between 60 and 90 percent, can realize the refining desulphurization of the molten steel until the content of sulfur is lower than 0.0010 percent, greatly improves the purity of the molten steel, and reduces smelting cost.

Description

technical field [0001] The invention relates to an out-of-furnace refining process for various microalloy steels and special steels, in particular to a process for desulfurization in the refining process, which is the preferred process for desulfurization in the refining process of various microalloy steels or special steels method. Background technique [0002] Generally speaking, except for individual steel types such as free-cutting steel, sulfur is a harmful element in steel, which forms sulfide inclusions in steel and reduces the ductility and toughness of steel, especially impact toughness. When sulfur exists in the form of iron sulfide, it will cause hot embrittlement. At the same time, the corrosion resistance of steel with high sulfur content will be greatly reduced, which is also unfavorable to the welding performance of steel. Sulfide stress corrosion cracking (SSCC) can occur in austenitic stainless steel through pitting corrosion, and the source of pitting corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 唐复平王晓峰刘万山孟劲松任子平李德刚陈本文王仁贵张军王文仲李镇张晓军孙群栗红
Owner ANGANG STEEL CO LTD
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