ROLLED STEEL FOR CRACKED CONNECTING RODS

WIPO Patent Application WO/2016/059664

A1

A rolled steel for cracked connecting rods according to the present embodiment contains, in mass percent, 0.30 to 0.40% of C, 0.60 to 1.00% of Si, 0.50 to 1.00% of Mn, 0.04 to 0.07% of P, 0.04 to 0.13% of S, 0.10 to 0.30% of Cr, 0.05 to 0.14% of V, 0.15% (exclusive) to 0.20% (inclusive) of Ti, and 0.002 to 0.020% of N, and can optionally contain Cu, Ni, Mo, Pb, Te, Ca, and Bi, the balance being Fe and impurities. fn1 defined by the formula (1) is 0.65 to 0.80. The ratio of the V content in large precipitates having a particle size of not less than 200 nm to the V content in the steel is not more than 70%, and the ratio of the Ti content in the large precipitates to the Ti content in the steel is not less than 50%. fn1 = C + Si/10 + Mn/5 + 5Cr/22 + (Cu + Ni)/20 + Mo/2 + 33V/20 - 5S/7 (1)

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TAKASUGA MOTOKI (JP)
MIYAKOSHI YUSUKE (JP)
HASEGAWA TATSUYA (JP)
MATSUDA HIDEKI (JP)
KAWAKAMI MASASHI (JP)
SAITO ISAMU (JP)

PCT/JP2014/005274

April 21, 2016

October 17, 2014

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NIPPON STEEL & SUMITOMO METAL CORP (JP)
HONDA MOTOR CO LTD (JP)

C22C38/00; C21D8/06; C22C38/60

WO2012164710A1

2012-12-06

JP2014025105A	2014-02-06
JP2010180473A	2010-08-19
JP2004277838A	2004-10-07
JP2004277817A	2004-10-07
KR20100049264A	2010-05-12

ASCEND IP LAW FIRM (JP)
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