| 发明名称 |
RAIL MANUFACTURING METHOD AND MANUFACTURING EQUIPMENT |
| 摘要 |
Rail manufacturing method performs, on at least a head of the rail that is hot after hot-rolled at an austenite region temperature or higher or after heated to the austenite region temperature or higher, forced cooling: for 10 seconds from start of the forced cooling so that a cooling rate at a surface of the head becomes 1° C./s to 20° C./s; during a period after a lapse of 10 seconds from the start until heat generation during transformation begins at the surface so that the cooling rate becomes 1° C./s to 5° C./s; during transformation from beginning to end of the heat generation during transformation so that the cooling rate becomes lower than 1° C./s or a temperature-rising rate becomes 5° C./s or lower; and during a period after the end of the heat generation during transformation until temperature at the surface becomes 450° C. or lower so that the cooling rate becomes 1° C./s to 20° C./s. |
| 申请公布号 |
US2016040263(A1) |
申请公布日期 |
2016.02.11 |
| 申请号 |
US201414770664 |
申请日期 |
2014.03.25 |
| 申请人 |
JFE STEEL CORPORATION |
发明人 |
OKUSHIRO Kenji;FUKUDA Hiroyuki;KIJIMA Hideo;YAMAGUCHI Moriyasu |
| 分类号 |
C21D9/04;C22C38/00;C21D1/56;C21D6/00;C21D1/667;C21D1/18 |
主分类号 |
C21D9/04 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A rail manufacturing method comprising:
performing forced cooling on at least a head of the rail that is hot after hot-rolled at an austenite region temperature or higher or after heated to the austenite region temperature or higher for 10 seconds from start of the forced cooling so that a cooling rate at a surface of the head becomes 1° C./s to 20° C./s; performing the forced cooling during a period after a lapse of 10 seconds from the start of the forced cooling until heat generation during transformation begins at the surface of the head so that the cooling rate at the surface of the head becomes 1° C./s to 5° C./s; performing the forced cooling during transformation from beginning to end of the heat generation during transformation so that the cooling rate at the surface of the head becomes lower than 1° C./s or a temperature-rising rate becomes 5° C./s or lower; and performing the forced cooling during a period after the end of the heat generation during transformation until temperature at the surface of the head becomes 450° C. or lower so that the cooling rate at the surface of the head becomes 1° C./s to 20° C./s. |
| 地址 |
Tokyo JP |
