发明名称 |
HOT COIL FOR LINE PIPE AND MANUFACTURING METHOD THEREFOR |
摘要 |
<p>The present invention provides a hot coil for a line pipe with which variation in the room temperature strength is reduced and low-temperature toughness is improved even with a hot coil for which there are many restrictions on the manufacturing conditions in the winding process, and provides a method for manufacturing said hot coil. A steel plate is held for a prescribed time between each rolling pass in the recrystallization temperature range, and a two-stage cooling is performed after hot rolling, thereby providing the steel structure of the center of the plate thickness with an effective crystal grain diameter of 3-10 mum and a total area ratio of bainite and acicular ferrite of 60-99% and, when the total area ratio of bainite and acicular ferrite for two given locations respectively are A and B, with the absolute value of A-B being 0-30%.</p> |
申请公布号 |
WO2013047702(A1) |
申请公布日期 |
2013.04.04 |
申请号 |
WO2012JP74969 |
申请日期 |
2012.09.27 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
HARA, TAKUYA;KINOSHITA, TAKESHI;TANAKA, KAZUAKI |
分类号 |
C22C38/14;C21D8/02;C21D9/46;C22C38/58 |
主分类号 |
C22C38/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|