| 摘要 |
PURPOSE:To obtain a material for the titled tool having superior wear resistance at high temp. and a remarkably long life, by forming a BN layer on the surface of a worked product of an alloy having a specified composition consisting of C, Si, Mn, Cr, Ni, Mo and Fe. CONSTITUTION:A cast alloy consisting of, by weight, 1.0-2.0% C, 0.10-1.5% Si, 0.30-2.0% Mn, 11-22% Cr, 0.60-8.0% Ni, 0.50-5.0% Mo and the balance Fe with inevitable impurities or further contg. one or more among 0.70-4.0% W, 0.50-5.0% Co, 0.10-2.0% V, 0.10-2.0% Nb, 0.020-2.0% Zr, 0.50-2.0% Al and 0.010-1.0% B is worked and borided to form a borided layer of >=100mum thickness. A nitrogen enriched layer of >=100mum thickness is then formed by surface nitriding to obtain a material for the titled tool having high heat conductivity, high strength at high temp. and surface self-lubricity. |
