| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material excellent in processability to a component shape and a pitting life without a polishing process after a carbonitriding treatment, and a component using the steel material.SOLUTION: A steel material for carbonitriding includes, by mass, 0.15-0.25% C, 0.03-1% Si, 0.2-0.5% Mn, 0.03% or less P, 0.03% or less S, 0.35-1.15% Cr, 0.25-0.9% Mo, 0.01-0.08% Al, 0.014% or less N, and the balance iron with inevitable impurities. In the formula below, an A value is 0.24 or less, a B value is 48 or more, a C1 value is 100 or less. A value=0.102×[Si]+0.084×[Mn]+0.149×[Cr], B value=21.538×[Cr]+71.825×[Mo], and C1 value=22.29×[Si]+60.60×[Mn]+18.09×[Cr]+121.99×[Mo]-50.12.SELECTED DRAWING: Figure 1 |
