Title:
UNTEMPERED STEEL AND UNTEMPERED STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2012/157455
Kind Code:
A1
Abstract:
Provided is an untempered steel having the chemical composition [Ti] - 3.4 [N] -1.5 [S] <0and0.60< [C] + ( [Si] /10) + ( [Mn] /5) + (5 [Cr] /22) + (33 [V] /20) - (5 [S] /7) <0.80 and comprising, by mass%, C：0.27 to 0.40%, Si：0.15 to 0.70%, Mn：0.55 to 1.50%, P：0.010 to 0.070%, S：0.05 to 0.15%, Cr：0.10 to 0.60%, V：0.030% or more but less than 0.150%, Ti: greater than 0.10% but 0.200% or less, Al：0.002 to 0.050%, N：0.002 to 0.020% and, when necessary, either Cu ≤ 0.40% or Ni ≤ 0.30%, with the balance being Fe and impurities. The untempered steel is ideal as a material for untempered steel members, such as the connecting rod of an automobile engine that undergoes fracture splitting after hot forging and molding into a predetermined shape and requires high yield strength. Moreover, untempered steel having the abovementioned chemical composition and σw ≥ 450MPa at vEＲＴ：1.0 to 7.0J/cm2 can be used as the connecting rod for an automobile engine, and the like.
Inventors:
SANO NAOYUKI (JP)
HASEGAWA TATSUYA (JP)
HASEGAWA TATSUYA (JP)
Application Number:
PCT/JP2012/061648
Publication Date:
November 22, 2012
Filing Date:
May 07, 2012
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
SANO NAOYUKI (JP)
HASEGAWA TATSUYA (JP)
SANO NAOYUKI (JP)
HASEGAWA TATSUYA (JP)
International Classes:
C22C38/00; C22C38/60
Foreign References:
| JP2004301324A | 2004-10-28 | |||
| JP2004277838A | 2004-10-07 | |||
| JP2010180473A | 2010-08-19 |
Attorney, Agent or Firm:
SUGIOKA, Kanji et al. (JP)
Sugioka Miki 2 (JP)
Sugioka Miki 2 (JP)
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Claims:
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