Title:
AGE-HARDENABLE STEEL, AND METHOD FOR MANUFACTURING COMPONENTS USING AGE-HARDENABLE STEEL
Document Type and Number:
WIPO Patent Application WO/2016/148206
Kind Code:
A1
Abstract:
Provided is an age-hardenable steel which has low hardness subsequent to hot forging, which through aging treatment endows mechanical components with the desired fatigue strength and yield strength, and which has high toughness subsequent to aging treatment. The steel comprises C: 0.09-0.20%, Si: 0.01-0.40%, Mn: 1.5-2.5%, S:0.001-0.045%, Cr: from more than 1.00 to 2.00%, Al: 0.001-0.060%, V: 0.22-0.55% and N: from more than 0.0080 to 0.0170%, the remainder being Fe and impurities. The area ratio of the bainite structure is 80% or greater. The effective V proportion (amount of V solid solution/total amount of V) is 0.9 or above. The amounts of P and Ti in the impurities are P: 0.03% or less and Ti: less than 0.005%. The steel has a chemical composition in which F1 described hereafter is 1.00 or less, and F2 described hereafter is 0.30 or more. F1 = C + 0.1 × Si + 0.2 × Mn + 0.15 × Cr + 0.35 × V
F2 = -4.5 × C + Mn + Cr - 3.5 × V
Inventors:
YUYA MASATO (JP)
TAKASUGA MOTOKI (JP)
MAKINO TAIZO (JP)
HIGASHIDA MASASHI (JP)
HASEGAWA TATSUYA (JP)
TAKASUGA MOTOKI (JP)
MAKINO TAIZO (JP)
HIGASHIDA MASASHI (JP)
HASEGAWA TATSUYA (JP)
Application Number:
PCT/JP2016/058391
Publication Date:
September 22, 2016
Filing Date:
March 16, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/60; C21D8/00; C21D9/00
Domestic Patent References:
| WO2012161323A1 | 2012-11-29 | |||
| WO2015050152A1 | 2015-04-09 |
Foreign References:
| JP2000017374A | 2000-01-18 | |||
| JPH04154936A | 1992-05-27 | |||
| JP2011241441A | 2011-12-01 | |||
| JP2012193416A | 2012-10-11 | |||
| JP2013253265A | 2013-12-19 |
Other References:
See also references of EP 3272896A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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