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Title:
ROLLED STEEL BAR OR WIRE ROD FOR HOT FORGING
Document Type and Number:
Japanese Patent JP2013040364
Kind Code:
A
Abstract:

To provide a rolled steel bar or wire rod for hot forging, which has high bending fatigue strength, contact fatigue strength and machinability, and in which heat treatment strain can be reduced.

The rolled steel bar or wire rod for hot forging comprises, by mass, 0.10 to 0.30% C, 0.30 to 0.60% Si, 0.60 to 1.00% Mn, 0.003 to 0.050% S, 1.50 to 2.00% Cr, ≤0.10% (including 0%) Mo, 0.010 to 0.050% Al and 0.0100 to 0.0250% N, and the balance Fe with impurities, and in which fn defined by formula (1): fn=Cr+2×Mo is 1.60 to 2.10. Further, a differential value between the maximum value and the minimum value is ≤10 in Ms values defined by formula (2): Ms=550-361×C-39×Mn-20×Cr-5×Mo in a plurality of measurement positions C1 to C17 in the cross-section CS of the steel bar or wire rod having a radius R.


Inventors:
USUI YUSUKE
OFUJI YOSHIHIRO
OHASHI TETSUYA
Application Number:
JP2011000176806
Publication Date:
February 28, 2013
Filing Date:
August 12, 2011
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
C22C38/00; C22C38/60
Domestic Patent References:
JP2010070827A2010-04-02
JP2009263767A2009-11-12
JP2009127095A2009-06-11
JP2010150566A2010-07-08
JP2010070827A2010-04-02
JP2009263767A2009-11-12
JP2009127095A2009-06-11
Attorney, Agent or Firm:
上羽 秀敏
松山 隆夫
坂根 剛
川上 桂子
竹添 忠