| 摘要 |
PROBLEM TO BE SOLVED: To produce a Cr-containing steel sheet, in which the range of the amount of C from eutectoid to hyper-eutectoid is specified and which has superior precision punchability and excellent rolling fatigue resistance as well as wear resistance after refining. SOLUTION: This steel sheet is a high carbon steel sheet having a composition consisting of, by weight, 0.75-1.00% C, 0.05-0.35% Si, 0.10-0.60% Mn, <=0.02% P, <=0.01% S, 0.50-1.00% Cr, 0.50-2.00% Ni, 0.10% Al, <=0.0015% O, <=0.5% Mo, and the balance essentially Fe with inevitable alloy components and also having a ferritic structure in which cementite of 0.5-2.0μm average grain size is dispersed. This steel sheet can be produced by controlling hot rolling finishing temp. and coiling temp. and performing annealing, as spheroidizing annealing, at 730-800 deg.C or by performing cold working at >=20% after hot rolling and then applying annealing at 650-800 deg.C.
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