PRODUCTION OF AUSTENITIC STAINLESS STEEL SHEET OR STEEL STRIP SMALL IN ANISOTROPY

摘要

PURPOSE: To produce a steel sheet having the properties of small inplane anisotropy by subjecting the slab of an austenitic stainless steel to heating treatment, hot rolling and hot rolled sheet annealing under specified temp. conditions, executing descaling and satisfying the specified formula by Lankford value. ;CONSTITUTION: The slab of an austenitic steel is heated to the temp. range of 1200 to 1300°C and is subjected to hot rough rolling, and the hot finish rolling is completed at ≥940°C. Next, it is subjected to hot rolled sheet annealing in the temp. range of 960 to 1200°C and is thereafter subjected to descaling to regulate the absolute value |Δr| of Δr shown by the formula of Δr={(r₀+r₉₀)/2}-r₄₅ (where r₀, r₉₀ and denote the Lankford value in the directions of 0°, 45° and 90° to the rolling direction, respectively) to ≤0.20. Thus, cold rolling and final annealing are eliminated, and the steel sheet (or steel strip) having workability equal to or above that of the conventional product and particularly small in inplane anisotropy can be obtd.;COPYRIGHT: (C)1996,JPO