STEEL MATERIAL AND CRANKSHAFT FORMED OF SAID STEEL MATERIAL

WIPO Patent Application WO/2022/249349

A1

The present invention provides a steel material which has excellent machinability, bending fatigue strength, wear resistance and bending straightening properties. This steel material contains, in mass%, 0.25% to 0.35% of C, 0.05% to 0.35% of Si, 0.85% to 1.20% of Mn, 0.080% or less of P, 0.030% to 0.100% of S, 0.10% or less of Cr, 0.050% or less of Ti, 0.050% or less of Al, 0.005% to 0.024% of N and 0.0100% or less of O, with the balance being made up of Fe and impurities; and with respect to this steel material, Fn1 set forth in the description is 1.00 to 2.05, and Fn2 set forth in the description is 0.42 to 0.60. The surface number density of MnS simple inclusions and MnS composite inclusions, each having a circle-equivalent diameter of 5.0 μm or more, is 20 per mm2 or more; the ratio of the total number of MnS simple inclusions and MnS composite inclusions relative to the total number of inclusions is 70% or more; and the ratio of the number of MnS composite inclusions relative to the total number of oxides is 30% or more.

WO/2012/124528	HIGH-PURITY FERRITIC STAINLESS STEEL SHEET WITH EXCELLENT CORROSION RESISTANCE AND ANTI-GLARE PROPERTIES
JPH05295430	PRODUCTION OF THICK PLATE WITH HIGH TOUGHNESS

TAKASUGA MOTOKI (JP)
NISHITANI SHIGEFUMI (JP)
YUYA MASATO (JP)
MATSUMOTO HITOSHI (JP)
HAMA SHOTA (JP)
MASUDA HIROKI (JP)
MATSUDA HIDEKI (JP)
TAKAHASHI HIROMASA (JP)

PCT/JP2021/020044

December 01, 2022

May 26, 2021

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NIPPON STEEL CORP (JP)
HONDA MOTOR CO LTD (JP)

C22C38/00; C22C38/60; F16C3/06; C21C7/00; C21C7/10

WO2005021816A1	2005-03-10
WO2017068935A1	2017-04-27

JP2017186658A	2017-10-12
JP2007197812A	2007-08-09
JP2017115190A	2017-06-29

ASCEND IP LAW FIRM (JP)

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