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STAINLESS ALLOY STEEL UNDERGOING HARDLY SURFACE CRACKING DURING HOT ROLLING AND METHOD FOR HEATING ITS SLAB
STAINLESS ALLOY STEEL UNDERGOING HARDLY SURFACE CRACKING DURING HOT ROLLING AND METHOD FOR HEATING ITS SLAB
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机译:不锈钢合金热轧过程中进行的表面硬裂纹及其板坯的加热方法
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摘要
PURPOSE:To reduce surface defects caused on a stainless alloy steel slab by cracking during hot rolling by specifying the amount of sol. Al added to the stainless alloy steel having a specified composition and by regulating the concn. of O2 in the atmosphere in a furnace when the slab is heated. CONSTITUTION:A stainless alloy steel is provided with a composition contg., by weight, 0.001-0.20% C, 0.10-5.0% Si, 0.1-11.0% Mn, =0.050% P, =0.020% S, 11.0-30.0% Cr, 2.0-3.0% Ni, 0.001-0.060% N, =0.015% O, =5.0% Mo, =3.0% Cu, =1.0% Nb, =0.05% Ti, =0.10% Zr, =0.06% Ca and =0.10% Sn and/or =0.05% B. The concn. of O2 in the atmosphere in a furnace is regulated to 0.5-5.0% and a slab of the steel is heated in the atmosphere. Thus, S and O2 in the steel are made harmless, so the occurrence of surface defects due to cracking during hot rolling is prevented.
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