公开(公告)号：US4042380A

公开(公告)日：1977-08-16

申请号：US686576

申请日：1976-05-14

申请人： Yoshihiro Yamaguchi ,  Takashi Shimohata ,  Sodai Kita ,  Yoshihide Fuchino ,  Tsugio Kaneda ,  Masashi Kawauchi ,  Sadayashi Furusawa ,  Shuzi Iwata

发明人： Yoshihiro Yamaguchi ,  Takashi Shimohata ,  Sodai Kita ,  Yoshihide Fuchino ,  Tsugio Kaneda ,  Masashi Kawauchi ,  Sadayashi Furusawa ,  Shuzi Iwata

IPC分类号： C22C38/00 ,  C22C38/14 ,  C22C38/60

CPC分类号： C22C38/14 ,  C22C38/60

摘要： This invention relates to a free-cutting steel that is used as a material for mechanical construction members be manufactured by machining as well as cold working.There has been proposed resulfurized free-machining steels containing large amounts of sulfur to improve the machinability, as well as resulfurized free-machining steels containing sulfur and zirconium to improve machinability and cold workability. None of these steels, however, simultaneously satisfy the machinability cold workability and mechanical properties required of steels used for the construction of machines.The present invention provides a steel comprising 0.08 to 0.6% of carbon, 0.35% or less of silicon, 0.3 to 1.5% of manganese, 0.04 to 0.15% of sulfur, 0.010 to 0.05% of aluminum, 0.01 to 0.08% of niobium, 0.008% or less of oxygen, 0.008% or less of nitrogen, wherein the amount of zirconium being 0.2 to 1.2 in terms of (Zr% -2.9x 0% -6.5x N%)/S%, the steel has a refined grain size and controlled sulfide morphology, and exhibits improved machinability, cold workability and mechanical properties.

摘要翻译： 本发明涉及一种用作机械构件的材料的自由切削钢，其通过机加工和冷加工制造。