STEEL MATERIAL, FORGED HEAT-TREATED ARTICLE, AND METHOD FOR MANUFACTURING FORGED HEAT-TREATED ARTICLE

WIPO Patent Application WO/2020/040190

A1

Through the present invention, high machinability, yield strength, and fatigue strength, and excellent cracking properties are obtained. This steel material has a chemical composition comprising, in terms of % by mass, 0.10-0.60% C, 0.05-1.00% Si, 0.30-1.50% Mn, no more than 0.1000% P, no more than 0.3000% S, 0.003-0.100% Al, and no more than 0.0200% N, the remainder comprising Fe and impurities, and the chemical composition satisfying formula (1). The steel material contains more than 70.0% by mass of Al2O3, and the number density of inclusions for which √AREA is at least 3 µm is 0.05-1.00/mm2. (1): 9 ≤ 7.6√C × (1+0.6Si) × (1 + 4Mn) × (1 – 0.6S) × (1 + 0.3Cu) × (1 + 0.5Ni) × (1 + 2Cr) × (1 + 3Mo) × (1 + (1.5 × (0.9 – C) × fB)) ≤ 130. In formula (1), fB is "0" when the B content (% by mass) is 0%, and is "1" when the B content exceeds 0%.

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MIYAKOSHI YUSUKE (JP)
TAKASUGA MOTOKI (JP)

PCT/JP2019/032621

February 27, 2020

August 21, 2019

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NIPPON STEEL CORP (JP)

C22C38/00; B21J5/00; C21D8/06; C21D9/00; C22C38/60; B26F3/02; C21C7/06

WO2018155604A1	2018-08-30
WO2019177034A1	2019-09-19

JPH0356640A	1991-03-12
JP2017106099A	2017-06-15
JP2013060631A	2013-04-04
JPH05117804A	1993-05-14
JP2006200027A	2006-08-03
JP2002302740A	2002-10-18
JPH0925507A	1997-01-28

ASCEND IP LAW FIRM (JP)

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