用等离子旋转电极工艺生产高氮钢

为了寻求高效、经济的高氮钢生产工艺，用等离子旋转电极工艺(PREP)生产高氮钢并测试了所生产的几种典型高氮钢的性能。结果表明，氮可显著地提高奥氏体不锈钢1．4301的室温及高温强度；氮可以提高马氏体不锈钢的强度。为保证高氮马氏体不锈钢的淬透性，应根据氮含量适当降低其碳含量或提高铬含量。对于铬含量为17％的马氏体不锈钢1．4122，其碳和氮的总含量不应超过0．65％；当氮含量达到0．24％时，铁素体不锈钢1．4016转变成为马氏体钢，其强度高于碳和氮的总含量与其相当的普通马氏体不锈钢1．4122。

High Nitrogen Steels Produced by Plasma Rotating Electrode Process

The high nitrogen steels (HNS) were produced by plasma rotating electrode process (PREP), and the properties of HNS specimens were examined. Nitrogen can markedly improve room temperature and high temperature strength of the austenitic steel 1.4301. Nitrogen can also increase the strength of the martensitic steel. In order to ensure the quenching properties of the martensitic steel with high nitrogen content, the carbon content in the steel should be reduced or the chromium content should be increased according to the nitrogen content. For the steel 1.4122 which contains about 17 % chromium, the (C+N) content should not be higher than 0.65 %. When the nitrogen content in the ferritic steel reaches 0.24 %, the ferritic stainless steel 1.4016 is transformed into martensitic steel, of which strength is higher than that of normal martensitic steel 1.4122 which possesses the (C+N) content similar to that of the high nitrogen steel.