| 摘要 |
An abrasion-resistant steel material with excellent extreme fatigue characteristics having a chemical composition containing, in terms of mass%, 0.30 to 0.90% C, 0.05 to 1.00% or less Si, 0.10 to 1.50% Mn, 0.003 to 0.030% P, 0.001 to 0.020% S, 0.10 to 0.70% Nb, and furthermore containing, as required, one or more of 1.50% or less Cr, 0.50% or less Mo, 0.50% or less V, 2.00% Ni, 0.10% or less Ti, 0.0050% or less B, the remainder being Fe and unavoidable impurities, the abrasion-resistant steel material having a metal structure after thermal refining in which Nb-containing carbide has been dispersed, and having the number of Nb-containing carbide particles with a particle diameter of 1.0 μm or more adjusted to 200/mm2 or more and a maximum particle diameter Dmax of the Nb-containing carbide particles in 103mm3 as estimated by an extreme value statistics method adjusted to 18.0 μm or less. |
