| 摘要 |
This steel material with high manufacturability and improved rolling fatigue characteristics contains C:0.65-1.30%, Si:0.05-1.00%, Mn:0.1-2.00%, P:0.050% or less (not including 0%), S:0.050% or less (not including 0%), Cr: 0.15-2.00%, Al:0.010-0.100%, N:0.025% or less (not including 0%), Ti:0.015% or less (not including 0%), O:0.0025% or less (not including 0%), with the remainder being iron and unavoidable impurities, wherein the average circle equivalent diameter of an Al-based nitrogen compound dispersed in the steel is 25-200nm, and the number density of said Al-based nitrogen compound having the 25-200nm circle equivalent diameter is 1.1-6.0 1/µm2. |
