公开(公告)号：US6090230A

公开(公告)日：2000-07-18

申请号：US866100

申请日：1997-05-30

申请人： Kazuo Okamura ,  Naruhito Shouji ,  Michiharu Hariki ,  Kunio Kondo

发明人： Kazuo Okamura ,  Naruhito Shouji ,  Michiharu Hariki ,  Kunio Kondo

IPC分类号： C21D6/00 ,  C21D9/08

CPC分类号： C21D9/085 ,  C21D6/002

摘要： A method of cooling a martensitic steel pipe by cooling the inner and outer surface substantially equally while rotating the pipe around the axis, wherein the cooling rate is 8.degree. C./s or higher. The inner surface is preferably cooled by passing water without completely filling the inside of pipe. The maximum cooling rate at the both surfaces is 35.degree. C./s or lower for a martensitic stainless steel pipe. The 2-step cooling method of a martensitic stainless steel pipe, comprising the 1st air cooling where the pipe is cooled from 30.degree. C. lower than Ms(martensitic transformation start temp.) to the average of Ms and Mf(martensitic transformation finish temp.) and 2nd intensive water cooling where the the pipe is cooled down below Mf. The 3-step cooling method comprising 1st intensive cooling where the pipe is cooled from Ms+400.degree. C. to Ms, 2nd mild cooling where the pipe is cooled from Ms to the average of Ms and Mf, and 3rd intensive cooling to the Mf.

摘要翻译： 冷却速度为8℃/ s以上的冷却马氏体钢管的方法，其特征在于，使所述管绕所述轴线旋转的同时冷却所述内外表面。 内表面优选通过水而不完全填充管内而被冷却。 对于马氏体不锈钢管，两面的最大冷却速度为35℃/秒以下。 马氏体不锈钢管的两步冷却方法，包括第一次空气冷却，其中管子从30℃低于Ms（马氏体相变开始温度）降低到Ms和Mf的平均值（马氏体转变终止温度 ）和第二次强制水冷却，其中管道被冷却到低于Mf。 3步骤冷却方法包括第一次强制冷却，管子从Ms + 400℃冷却至Ms，第二次轻度冷却，其中管道从Ms冷却至Ms和Mf的平均值，第三次冷却至Mf 。