Sollac

Usinor

Michel Babbit

Michel Faral

Christophe Issartel

Catherine Juckum

Odile Faral

Thierry Iung

H&eacute;l&egrave;ne Regle

Method of fabricating &ldquo;TRIP&rdquo; steel in the form of thin strip, and thin strip obtained in this way

The subject for the invention is a process for manufacturing strip. The process includes casting directly from liquid metal a steel strip 1.5 to 10 mm in thickness, subjecting the cast steel strip, in the austenitic phase, to a first hot rolling operation in one or more steps at a temperature of between 950&deg; C. and the Ar,temperature of said strip with an overall reduction ratio of at least 10%, then subjecting the hot rolled strip, in the ferritic phase, to a second hot rolling operation in one or more steps at a temperature below 850&deg; C., with an overall reduction ratio of at least 50% in the presence of a lubricant, so as to obtain a hot-rolled sheet with a thickness of less than or equal to 2 mm, and recrystallizing the hot rolled sheet at a temperature between 700 and 800&deg; C. The composition of the steel strip comprises (in weight %): carbon less than 0.1%, manganese from 0.03 to 2%, silicon from 0 to 0.5%, phosphorus from 0 to 0.1%, boron from 0 to 0.002%, titanium from 0 to 0.15%, balance iron and impurities.

Process for manufacturing drawable sheet by direct casting of thin strip, and sheet thus obtained

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Metz, France

Michel Babbit