| 摘要 |
PURPOSE:To manufacture a steel plate having superior carburizing property, by controlling hot rolling conditions as well as the quantity of Al and N. CONSTITUTION:The steel has a composition consisting of, by weight, 0.05-0.5% C, <0.4% Si, 0.2-1.2% Mn, >0.02% Al, 0.005-0.016% N, and the balance Fe with inevitable impurities, and satisfying (Al+2N)>=0.04 and (Al+5N)<=0.11. This steel is heated to <=1,200 deg.C and then hot-rolled at finishing temp. of >=Ar3 point and at winding temp. of 350-550 deg.C. Cr (<1.5%) and/or Mo (<1%) is further added to the above composition, if necessary.
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