发明名称 |
SEAMLESS-METAL-PIPE MANUFACTURING METHOD |
摘要 |
A method of producing a seamless metal pipe, which can suppress the occurrence of inner surface flaws, is provided. A method of producing a seamless metal pipe according to an embodiment of the present invention includes the steps of: heating a high alloy billet BL containing, by mass%, Cr: 20 to 30% and Ni: more than 22% and not more than 60% in a heating furnace F1 (S2); piercing-rolling the high alloy billet BL heated in the heating furnace F1 with a piercing machine P1 to produce a hollow shell (S3); cooling the hollow shell and then reheating the hollow shell in the heating furnace F1 (S4); and elongation-rolling the heated hollow shell with the piercing machine P1 (S5). |
申请公布号 |
EP2754508(A4) |
申请公布日期 |
2015.04.01 |
申请号 |
EP20120845543 |
申请日期 |
2012.10.24 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
YAMANE, KOUJI;YAMAKAWA, TOMIO;SHIMODA, KAZUHIRO |
分类号 |
B21B19/06;B21B19/04 |
主分类号 |
B21B19/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|