公开(公告)号：US20080035296A1

公开(公告)日：2008-02-14

申请号：US11789710

申请日：2007-04-25

申请人： Satoru Nakamyo

发明人： Satoru Nakamyo

IPC分类号： B22D25/00

CPC分类号： C22C38/02 ,  B22D25/00 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

摘要： Disclosed is a production process that can suppress the formation of large-diameter TiN or N-rich TiCN inclusions which adversely affect machinability and consequently can produce a cast steel billet or steel ingot or a steel material of a Ti-added case hardening steel having excellent machinability. The production process comprises the step of casting a steel comprising by weight carbon (C): 0.10 to 0.30%, titanium (Ti): 0.05 to 0.20%, and nitrogen (N): not more than 0.0100% into a round cast steel billet or steel ingot having a diameter of not more than 23 cm or, in the alternative, a rectangular cast steel billet or steel ingot having a short side length of not more than 23 cm.

摘要翻译： 公开了一种能够抑制大直径TiN或富N型TiCN夹杂物的形成的制造方法，其对机械加工性有不利影响，因此可以制造出具有优异性能的铸钢坯料或钢锭或具有优异的Ti添加的表面硬化钢的钢材 机械加工性 该制造方法包括将碳（C）：0.10〜0.30％，钛（Ti）：0.05〜0.20％，氮（N）：0.01％以下）的钢铸造到圆钢坯中 或直径不大于23cm的钢锭，或者替代地，具有短的侧面长度不超过23cm的矩形铸钢坯料或钢锭。

公开(公告)号：US20090110589A1

公开(公告)日：2009-04-30

申请号：US12083353

申请日：2006-10-11

申请人： Yoshimi Usui ,  Yutaka Sato ,  Masahiko Igarashi ,  Wataru Yanagita ,  Hideo Watanabe ,  Satoru Nakamyo

发明人： Yoshimi Usui ,  Yutaka Sato ,  Masahiko Igarashi ,  Wataru Yanagita ,  Hideo Watanabe ,  Satoru Nakamyo

IPC分类号： C22C38/22 ,  C21D9/08

CPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32

摘要： A steel material of 85 to 95 HRB exhibiting a ratio of area occupied by ferrite of 30% or higher, which steel material comprises given amounts of C, Si, Mn, S, Ti, Cr, Al and B and the balance of iron and unavoidable impurities, is subjected to induction hardening. After the hardening, the surface of the steel material exhibits an Hv value of 640 to 730. When t refers to the effective hardening depth, namely, the distance from the surface to a region exhibiting an Hv value of 392 and r refers to the radius of the steel material, the hardened layer ratio, t/r, is 0.4 or higher.

摘要翻译： 85〜95HRC的钢材表现出铁素体占据的面积比例为30％以上，该钢材含有给定量的C，Si，Mn，S，Ti，Cr，Al和B，余量为铁和 不可避免的杂质，进行感应淬火。 硬化后，钢材表面的Hv值为640〜730.当t表示有效的硬化深度，即从表面到显示Hv值为392的区域的距离，r表示半径 的钢材，硬化层比t / r为0.4以上。