| 摘要 |
PURPOSE:To prevent the generation of surface flaw even when a material to be rolled is rolled under the usual conditions which tend to cause the surface flaw, by supplying a hydroxide of iron to the material between the passes of rollings, in the hot rolling of a stainless steel containing >=11% Cr. CONSTITUTION:In the hot rolling of a stainless steel containing >=11% Cr, a hydroxide of iron is supplied to a material to be rolled between the passes of rough rollings or the passes of rough rolling and finish rolling. In this way, oxidized scales stuck to the surface of material during rolling, are stripped off, and oxidized scales are reformed on the exposed part of a metallic surface, and the generation of surface flaw is prevented by rolling the material thereafter. The supply of iron hydroxide is performed, for instance, by spraying a colloidal solution, prepared by suspending the oxide in water, on the material. Further the oxidized scale to be reformed is used for the purpose of enhancing a lubricating effect, and is reduced in thickness to prevent it from causing a force-in flaw. |
