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Complex RH decarburization method

A decarbonization and combination technology, applied in the field of metallurgy, can solve the problems of no production precedent, long decarburization time, severe mid-term reaction and potential safety hazards, etc., and achieve the effect of safe decarburization

Active Publication Date: 2014-02-12
ANGANG STEEL CO LTD
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AI Technical Summary

Problems solved by technology

Anshan Iron and Steel produces low-carbon special steel. The carbon distribution in the steelmaking process is 1500-2000ppm, and the finished carbon is below 350ppm. The carbon content in this composition range is generally decarburized by VOD. It is necessary to decarbonize to about 100ppm. Under medium-high carbon conditions, RH decarburization has problems such as long decarburization time, severe mid-term reaction and potential safety hazards. There is no production precedent at home and abroad.

Method used

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Embodiment 1

[0019] Taking the production of stainless steel in a 105-ton steel ladle as an example, a non-vacuum treatment method for reducing hydrogen content in steel includes the following steps:

[0020] 1) The oxygen supply for RH decarburization adopts the combination of solid oxygen and blowing high-pressure oxygen for decarburization, and the RH temperature is controlled at 1575-1580°C to avoid the temperature being too high or too low during RH deoxidation;

[0021] 2) Carry out pressure control, when the pressure in the vacuum chamber reaches 20-22kPa, add 2.0kg / ton of steel containing Fe every 2 minutes 2 o 3 The solid ball, add 2 batches continuously;

[0022] 3) After the liquid level reaction in the vacuum chamber is stable, control the pressure in the vacuum chamber at 10-12kPa, add 2.0kg / ton of steel containing Fe2O3 solid balls every 2 minutes, add 2 batches continuously, and add 1.0kg / ton of steel containing Fe2O3 Fe 2 o 3 The solid ball reduces the carbon content by...

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Abstract

The invention relates to a complex RH decarburization method, which comprises the following steps: 1) decarburizing RH decarburization oxygen supply by adopting a mode of combining solid oxygen with blown high-pressure oxygen; 2) when the vacuum interior pressure reaches 20-25kPa, adding 0.1-3.0kg / tonnage steel containing Fe2O3 solid spheres; 3) controlling the vacuum pressure at 10-15kPa, adding 0.1-3.0kg / tonnage steel containing Fe2O3 solid spheres; 4) automatically vacuumizing; 5) reducing the oxygen blowing by a top lance; 6) promoting the gas flow at the oxygen blowing earlier stage; 7) stopping oxygen blowing when carbon in the steel reaches 100ppm below; 8) after the circulation is finished, breaking and carrying out. Compared with the prior art, the complex RH decarburization method has the beneficial effects that the fast, stable and safety decarburization is realized, and the method can be used for producing low-carbon special steel in which the content of molten steel carbon is distributed in 1000-2000ppm, and of finished carbon is distributed below 350ppm before RH decarburization.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an RH composite decarburization method. Background technique [0002] Domestic and foreign RH treatment decarburization steels generally have an RH carbon content of no more than 650ppm, and the highest carbon content does not exceed 800ppm. Anshan Iron and Steel produces low-carbon special steel. The carbon distribution in the steelmaking process is 1500-2000ppm, and the finished carbon is below 350ppm. The carbon content in this composition range is generally decarburized by VOD. It is necessary to decarbonize to about 100ppm. Under medium-high carbon conditions, RH decarburization has problems such as long decarburization time, severe mid-term reaction and potential safety hazards. There is no production precedent at home and abroad. Contents of the invention [0003] The purpose of the present invention is to provide a rapid, stable and safe RH compound decarburization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068
Inventor 徐向阳李田张晓军刘建东闻学东许艳丽张宏亮丁勇王国庆
Owner ANGANG STEEL CO LTD
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