Title:
STEEL MATERIAL FOR VACUUM CARBURIZATION, AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2015183227
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To obtain: a carburization part having sufficient surface fatigue strength and a carburization part having surface fatigue strength and flex fatigue strength; and a steel material for obtaining the carburization parts.SOLUTION: The present invention is a steel material for vacuum carburization containing C, Si, Mn, S, P, Cr, Mo, V, Al, and N, in which an average circle-equivalent diameter of a vanadium carbide is 25 nm or less. The present invention also includes a method for manufacturing the steel material. Specifically, the method includes subjecting a steel having a predetermined chemical ingredient composition to blooming by holding the steel at 1200°C or above for 30-300 minutes, followed by hot rolling by setting a heating temperature before the hot rolling to 950°C or above and heating retention time to 30 minutes to 5 hours.
Inventors:
KAIZUKA MASAKI
SHINTO YOSUKE
OKAMOTO SHIGEAKI
SHINTO YOSUKE
OKAMOTO SHIGEAKI
Application Number:
JP2014060210A
Publication Date:
October 22, 2015
Filing Date:
March 24, 2014
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
C22C38/00; C21D1/06; C21D7/06; C21D8/06; C21D9/32; C22C38/34
Domestic Patent References:
| JP2006183095A | 2006-07-13 | |||
| JP2003193137A | 2003-07-09 | |||
| JPH04201128A | 1992-07-22 |
Attorney, Agent or Firm:
Kyuichi Ueki
Hisahiko Ueki
Tadashi Sugakawa
Hiroaki Ito
Hitomi Mizushima
Hisahiko Ueki
Tadashi Sugakawa
Hiroaki Ito
Hitomi Mizushima
Previous Patent: CARBURIZATION METHOD FOR STEEL MATERIAL
Next Patent: SEPARATION METHOD OF PALLADIUM AND PLATINUM
Next Patent: SEPARATION METHOD OF PALLADIUM AND PLATINUM