发明名称 |
LINEAR SHAPE STEEL EXCELLENT IN JOINT FATIGUE CHARACTERISTICS AND PRODUCTION METHOD THEREFOR |
摘要 |
<p>When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3 - 50 DEG C, thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm. <IMAGE></p> |
申请公布号 |
EP1209244(A1) |
申请公布日期 |
2002.05.29 |
申请号 |
EP20010921983 |
申请日期 |
2001.04.23 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
KIMURA, TATSUMI;MORIKAGE, YASUSHI;AMONO, KENITI;OKUI, TAKANORI;TAOKA, KEIZOU;MIURA, HIRONORI;OOKUBO, HIROYUKI;KAWABATA, FUMIMARU |
分类号 |
B21B1/08;C21D8/00;C21D8/02;C21D9/44;C22C38/00;C22C38/02;C22C38/04;E21D9/04;(IPC1-7):C22C38/00;C22C38/58 |
主分类号 |
B21B1/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|