Title:
STEEL MATERIAL FOR VACUUM CARBURIZING AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2015/146703
Kind Code:
A1
Abstract:
The purpose of the present invention is to obtain: a carburized component having sufficient surface fatigue strength, moreover a carburized component having surface fatigue strength and bending fatigue strength; and a steel material for obtaining the carburized component. The present invention is a steel material for vacuum carburizing, which contains C, Si, Mn, S, P, Cr, Mo, V, Al and N, and wherein vanadium carbide has an average circle-equivalent diameter of 25 nm or less. The present invention also includes a method for producing the steel material, and specifically provides a method for producing a steel material for vacuum carburizing, wherein a mass of steel having a predetermined chemical composition is maintained at 1,200°C or higher for 30-300 minutes and slabbed, and then is subjected to hot rolling, while setting the heating temperature before hot rolling to 950°C or higher and setting the heating retention time before hot rolling to 30 minutes to 5 hours.
Inventors:
KAIZUKA MASAKI
SHINDO YOSUKE
OKAMOTO NARIAKI
SHINDO YOSUKE
OKAMOTO NARIAKI
Application Number:
PCT/JP2015/057833
Publication Date:
October 01, 2015
Filing Date:
March 17, 2015
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21D1/06; C21D7/06; C21D8/06; C21D9/28; C21D9/32; C22C38/34; C23C8/22
Foreign References:
| JP2006183095A | 2006-07-13 | |||
| JP2003193137A | 2003-07-09 | |||
| JPH04201128A | 1992-07-22 |
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
Hisakazu Ueki (JP)
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