A kind of rh compound decarburization method

Abstract

The invention relates to a RH composite decarburization method, comprising the following steps: 1) RH decarburization oxygen supply adopts the combination of solid oxygen and blowing high-pressure oxygen for decarburization; 2) when the pressure in the vacuum chamber reaches 20-25kPa, add 0.1 ~3.0kg / ton steel containing Fe 2 o 3 3) Control the vacuum pressure at 10-15kpa, add 0.1-3.0kg / ton steel containing Fe 2 o 3 4) Automatic vacuuming; 5) Start lowering the top gun to blow oxygen; 6) Increase the gas flow rate in the early stage of oxygen blowing; 7) Stop oxygen blowing when the carbon in the steel reaches below 100ppm; . Compared with the existing technology, the beneficial effect of the present invention is: realize fast, stable and safe decarburization, and be used for the production of low-carbon special steel with a carbon content of 1000-2000 ppm in molten steel before RH decarburization and a carbon content of the finished product below 350 ppm. steel.

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 ...

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.