| 摘要 |
PURPOSE:To obtain a high-Mn steel having high rolling contact fatigue characteristic by subjecting a high-Mn steel having a specific composition consisting of C, Si, Mn and Fe to solution heat treatment, pearlitizing heat treatment, another solution heat treatment, each under proper conditions, and then to rapid cooling. CONSTITUTION:The high-Mn steel consisting of, by weight, 0.7-1.5% C, <=0.8% Si, 10-15% Mn and the balance Fe with inevitable impurities and further, if necessary, one or more kinds among <=5% Ni, <=3% Cr, <=1.5% Cu, <=3% Mo, <=3% V and <=2% Ti is subjected to solution heat treatment at 1,000-1,200 deg.C and then to rapid cooling to form an austenitic single phase. Then, the above steel is heated up to 500-700 deg.C and held, which is tempered here to undergo pearlitizing heat treatment. Successively, the steel is air-cooled and then reheated to under go another solution heat treatment, which is finally rapid-cooled by water cooling. In this way, the high-Mn steel having high rolling contact fatigue characteristic can be obtained. |
