发明名称 |
STEEL MATERIAL CONTAINING FINE GRAPHITE PARTICLES UNIFORMLY DISPERSED THEREIN AND HAVING EXCELLENT COLD WORKABILITY, MACHINABILITY AND HARDENABILITY, AND METHOD OF MANUFACTURING THE SAME |
摘要 |
This invention provides a fine graphite uniform dispersion steel material excellent in cold workability, cuttability and hardenability by particularly dispersing graphite finely and uniformly, and a production method thereof, this steel comprising 0.30 to 1.0% of C, 0.4 to 1.3% of Si, 0.3 to 1.0% of Mn, 0.0003 to 0.006% of B, 0.002 to 0.010% of N and 0.05 to 0.20% of Mo as the basic components and contains graphite having a mean grain diameter of not more than 4.0 mu m and a number of grains of at least 3,000 pcs/mm<2>, and the production method comprising cooling the steel having these components at a cooling start temperature of not less than an Ar1 point, a cooling end temperature of not more than an Ms point and a mean cooling rate of 5 to 100 DEG C/s. |
申请公布号 |
EP0751232(A4) |
申请公布日期 |
1997.05.21 |
申请号 |
EP19950909974 |
申请日期 |
1995.02.24 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
KATAYAMA, SAKAE;TARUI, TOSHIMI;TODA, MASAHIRO;NAITO, KEN-ICHIRO |
分类号 |
C21D1/26;C21D1/84;C21D5/14;C21D8/06;C22C38/12;C22C38/60 |
主分类号 |
C21D1/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|