含氮奥氏体气阀钢的真空冶炼工艺

Technology of Smelting Nitrogen Alloyed Austenitic Valve Steel

利用真空感应炉熔炼含氮奥氏体气阀钢,多次熔炼试验结果表明,采用两次加碳脱氧可使钢液深度脱氧,氧含量可达（10~15）×10^-6;炉料化清后往真空室通入60%N2＋40%Ar可有效抑制N和Mn从钢液中逸出,准确控制N和Mn的含量;用含氮金属锰作N的加入剂,在还原期末钢液合金化完毕后加入,可以获得满意的Mn含量。

A technology of smelting nitrogen alloyed austenitic steel used for valve by vacuum induction furnace was investigated. The results of repeatedly smelting experiment show that twice carbon-adding during melting can result in the deoxidation of mohen steel with oxygen content of （10-15）×10^-6;. Supplying of 60%N2 and 40% Ar into vacuum chamber will suppress the escape of nitrogen and manganese from the molten steel efficiently and easy to control the content of nitrogen and manganese precisely. Being added to the molten steel at the end of reducing period after the finish of alloying, the element manganese with N containing will lead to an appropriate content of manganese in the anstenitic steel.