| abstract |
PROBLEM TO BE SOLVED: To be used for a material of a high-strength steel plate part required to have a Vickers hardness of 650 or more after heat treatment, having a soft and good formability before heat treatment, and excellent in hardness after heat treatment A high carbon steel sheet having high wear resistance is provided. SOLUTION: C: 0.50 to 1.00%, Si: 0.35% or less, Mn: 0.60 to 0.90%, P: 0.015% or less, S: 0.0030% or less, Cr: 0.30 to 0.60%, sol. Al: 0.005 to 0.080%, N: 0.0050% or less, remaining Fe and impurities, and the content of Cr and Mn is 1.2 ≦ (Mn / 55) / (Cr / 52) A high carbon steel sheet satisfying ≦ 2.0, having an average crystal grain size of ferrite of 10 μm or more, and a ratio of the number of spheroidized carbides having a particle size of 1.0 μm or more of 50% or more. is there. [Selection figure] None |