| 摘要 |
PURPOSE:To restrain the generation of edge cracks in hot rolling, by hot rolling a 2-phase stainless steel slab, containing specific amounts of Cr, Ni, Mo, S, under a specific draft, and soaking it before rolling it into a hot coil or thick sheet. CONSTITUTION:A steel consisting of, by weight percent, 20-30% Cr, 3-10% Ni, 0.5-5% Mo, <=30ppm S and the balance Fe with inevitable impurities, is provided with solid-solution treatment within a range of 1,000-1,200 deg.C. Next, the 2-phase stainless steel ingot having austenite and ferrite phases, is forged or continuously cast into a slab. The slab is hot rolled under a >=5% draft, and then soaked for 2-30 hours within a range of 1,100-1,300 deg.C. Succesively, said product is hot rolled by a hot strip mill or thick sheet mill. In this way, the lowerings of yield and productivity due to the edge cracks generated in hot rolling, are restrained.
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