| 摘要 |
PURPOSE:To obtain a centrifugally cast high Cr work roll with very superior resistance to wear, surface roughening and accidents by solidly combining an outer layer, a core material and a middle layer each made of cast iron having a specified composition contg. C, Si, etc. CONSTITUTION:This high Cr work roll is obtd. by metallurgically solidly combining an outer layer made of cast iron consisting of 2-3.2% C, 0.5-1.5% Si, 0.5- 1.5% Mn, <=0.08% P, <=0.06% S, 1-2% Ni, 10-25% Cr, 0.5-1.5% Mo, <=1% Nb, <=1% V and the balance Fe, a core material consisting of 3-3.8% C, 2.3-3% Si, 0.3-1% Mn, <=0.1% P, <=0.02% S, <=2% Ni, <=1.5% Cr, <=1% Mo, 0.02- 0.1% Mg, etc. and a middle layer consisting of 1-2.5% C, 0.5-1.5% Si, 0.5- 1.5% Mn, <=1.5% Ni, 0.5-1.5% Cr, <=1% Mo, etc. |
