STEEL MATERIAL

Abstract: a steel material according to the present disclosure contains c: 0.10 to 0.45%, si: 1.00% or less, mn: 0.01 to 1.00%, al: 0.001 to 0.100%, cr: 0.1 to 2.0%, and mo: 0.20 to 2.00%, contains any one or more elements among ca: 0.0005 to 0.0200% and mg: 0.0005 to 0.0200%, contains any one or more elements among ti: 0.001 to 0.300%, nb: 0.001 to 0.300%, and v: 0.01 to 0.50%, with the balance being fe and impurities, and satisfies formulae (1) and (2) described in the description. the yield strength is 862 mpa or more. a number density of mx-type precipitates which have an equivalent circular diameter of 100 nm or less and in which, when the total content of mo, nb, v, and ti is defined as 100% by mass, the content of mo is more than 50% by mass is 20/�mor more.

Inventor(s): Mikiko NOGUCHI, Jun NAKAMURA, Masayuki SAGARA, Keiichi KONDO, Hisashi AMAYA, Hiroki KAMITANI

CPC Classification: C22C38/22 (ALLOYS (flints ; treatment of alloys , ))

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