Deep drawing, cold rolled steel mfr. - by casting and rolling, thin slabs of electric or converter steel with higher scrap components using technology used for processing raw iron@-based steels

摘要

Mfr. of deep drawing cold rolled steel from electric steel or converter steel with a high scrap component by casting and rolling thin slabs. The process comprises: (a) smelting of raw and scrap steel in an electric furnace or a converter, (b) metallurgical treatment of the molten raw steel, (c) prodn. of warm rolled strip by casting and rolling thin slabs, and (d) processing of the warm strip, resulting in cold rolled strip with deep drawing properties. The properties bestowed on the warm rolled strip by rolling and cooling (using techniques suitable for electric and converter steels of this nature i.e. with scrap iron content) allow further processing to achieve cold rolled strip (with deep drawing properties), using technology customarily used in the processing of warm rolled strip mfd. from raw iron-based converter steel. The yield strength of the warm rolled strip produced by the claimed process is pref. at least 10% less than that of warm rolled strip from raw iron-based converter steel commonly used in the prodn. of deep drawing cold rolled steel. The final structure of the warm rolled strip has a mean ferrite particle size of less than 10 micrometres. ADVANTAGE - Good process economics, uniform prod. quality and an expanded range of prods. mfd. from cold strip are obtd.it