公开(公告)号：US20050161131A1

公开(公告)日：2005-07-28

申请号：US11086410

申请日：2005-03-23

申请人： Hidetoshi Yoshikawa ,  Tomohiro Nakano ,  Takayuji Sakakibara ,  Masami Wakita

发明人： Hidetoshi Yoshikawa ,  Tomohiro Nakano ,  Takayuji Sakakibara ,  Masami Wakita

IPC分类号： C21D1/10 ,  C21D8/06 ,  C21D9/02 ,  C21D9/52 ,  C21D9/60

CPC分类号： C21D8/06 ,  C21D8/065 ,  C21D9/02 ,  C21D9/525 ,  C21D9/60 ,  Y02P10/253

摘要： [OBJECT] An oil-tempered wire for a cold-formed coil spring having a quality equivalent of or higher than a hot-formed coil spring is provided. A cold-formed coil spring made from the oil-tempered wire is also provided. [MEANS FOR SOLVING THE PROBLEM] Material used is the steel which contains, in weight percentage, 0.35 to 0.55% C, 1.8 to 3.0% Si, 0.5 to 1.5% Mn, 0.5 to 3.0% Ni, and 0.1 to 1.5% Cr. The ferrite fraction in the microscopic structure of this material is set to 50% or less. Hot rolled wire is cold drawn with a predetermined reduction of area, and a heat treatment using high frequency induction heating is conducted. It is preferable to set the maximum heating temperature between 900° C. to 1020° C. (favorably 950° C.) and the holding time between 5 to 20 seconds. It is preferable to make the oil-tempered material to have the grain size number of 9 or more, and the tensile strength from 1830 to 1980 MPa.

摘要翻译： 本发明提供一种用于冷成形螺旋弹簧的油回火丝，其质量等于或高于热成形螺旋弹簧。 还提供了由油回火丝制成的冷成型螺旋弹簧。 [用于解决问题的方法]使用的材料是重量百分数为0.35-0.55％，Si为1.8-3.0％，Mn为0.5-1.5％，Ni为0.5-3.0％，Cr为0.1-1.5％的钢。 该材料的微观结构中的铁素体部分设定为50％以下。 热轧钢丝以预定的面积减少冷拉，进行使用高频感应加热的热处理。 优选将最大加热温度设定在900℃至1020℃（有利地950℃）和5至20秒之间的保持时间。 优选使油回火材料的粒径为9以上，拉伸强度为1830〜1980MPa。