Daido Steel Co., Ltd.

Jtekt Corporation

Diado Steel Co., Ltd.

Kazuhisa Ishida

Hiroyuki Takabayashi

Tomoya Hattori

Kazuhisa Kitamura

Hisato Nishisaka

Keita Hinoshita

Kanji Kawasaki

Yusuke Kusafuka

Nao Inazaki

Fumihiro Furukawa

Takashi Kano

Yutaka Kurebayashi

Koichiro Inoue

Makoto Hobo

Masakazu Hayaishi

A rolling-sliding member that is high in hardness and continues to have a passivation film reliably even after being subjected to a process that does not require any processing for removal of scale, etc., as well as a rolling bearing using the same and a method for manufacturing the rolling-sliding member.

Rolling slide member, rolling bearing using same, and method for manufacturing rolling slide member

A rolling-sliding member that is high in hardness and continues to have a passivation film reliably even after being subjected to a process that does not require any processing for removal of scale etc., as well as a rolling bearing using the same and a method for manufacturing the rolling-sliding member.

Disclosed is a steel for machine structural use having good machinability and chip-breakability as well as a method of producing the steel. The steel consists essentially of, by wt. %, C: 0.05-0.8%, Si: 0.01-2.0%, Mn: 0.1-3.5%, S: 0.01-0.2%, Al: 0.001-0.020%, Ca: 0.0005-0.02%, O: 0.0005-0.01% and N: 0.001-0.04%, and further, one or both of Ti: 0.002-0.010% and Zr: 0.002-0.025%, the balance being Fe and inevitable impurities. At production of the steel controlled deoxidization is conducted by operation meeting certain conditions so that at least a certain amount of &ldquo;duplex inclusion&rdquo; having a specific chemical composition may be formed, and Ti and/or Zr is added to precipitate finely dispersed MnS inclusion particles with nuclei of Ti-oxide and/or Zr-oxide. The finely dispersed MnS inclusions must share a determined part of the total sulfide inclusions.

Steel for machine structural use having good machinability and chip-breakability

Non-heat treated steel for soft nitriding

Growing community of inventors

Osaka, Japan

Kazuhisa Ishida