| 摘要 |
PURPOSE:To make possible the production of a hot rolled steel strip free from the generation of an edge crack, etc. at a good yield by subjecting a two-phase stainless steel billet to hot rough rolling and cooling under specific conditions then reheating the same and hot rolling the reheated steel. CONSTITUTION:The continuously cast slab of the stainless steel having two phases; ferrite phase and austenite phase has poor hot workability and even if a steel strip is produced therefrom by any means, the edge crack arises at both side ends and the product yield is extremely low. The continuously cast slab of the two-phase stainless steel is once roughly rolled at the finishing temp. of >=980 deg.C and 10-50% draft in this case. The slap is then cooled to <=600 deg.C at a cooling rate of >=0.4 deg.C/sec down to an ordinary temp. and thereafter the slab is reheated to about 1,200-1,300 deg.C and is hot rolled in the temp. region of >=900 deg.C to form the steel strip. The production of the hot rolled strip of the two-phase stainless steel at the high yield without the generation of the edge crack which is the defect of the conventional practice at the steel strip is thus made possible. |
