发明名称 |
METHOD FOR PRODUCING METAL TUBE |
摘要 |
In this method, the inner surface of a metal pipe containing, by mass percent, 20 to 55% of Cr and 20 to 70% of Ni is subjected to mechanical treatment, the metal pipe is subjected to heat treatment such as to be held in a temperature range of 1050 to 1270°C for 0.5 to 60 minutes, and thereby an oxide scale layer consisting mainly of Cr is formed on at least the inner surface of the metal pipe. A metal pipe excellent in carburization resistance and coking resistance in a carburizing gas environment can be obtained by the method. |
申请公布号 |
EP2397573(A4) |
申请公布日期 |
2012.12.26 |
申请号 |
EP20100741311 |
申请日期 |
2010.02.15 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
NISHIYAMA, YOSHITAKA;UEYAMA, MASAKI;TOYODA, MASATOSHI |
分类号 |
C23C8/10;B21C37/20;B21C37/22;B21C37/30;C21D7/06;C21D9/08;C22C19/05;C22C38/00;C22C38/60;F16L9/02 |
主分类号 |
C23C8/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|