Arcelormittal

Thyssen Stahl Ag

Usinor Sacilor

Manuel Bobadilla

Frédéric Bonnet

Valérie Daeschler

Bertrand Bele

Jean-Michel Damasse

Christian Marchionni

Philippe Paradis

A steel sheet has a composition comprising, by weight: 0.010%&#x2264;C&#x2264;0.080%, 0.06%&#x2264;Mn&#x2264;3%, Si&#x2264;1.5%, 0.005%&#x2264;Al&#x2264;1.5%, S&#x2264;0.030%, P&#x2264;0.040%, Ti and B such that: 3.2%&#x2264;Ti&#x2264;7.5% and (0.45&#xd7;Ti)&#x2212;1.35&#x2264;B&#x2264;(0.45&#xd7;Ti)&#x2212;0.43, optionally Ni&#x2264;1%, Mo&#x2264;1%, Cr&#x2264;3%, Nb&#x2264;0.1%, V&#x2264;0.1%, the remainder being iron and unavoidable impurities resulting from the smelting. The steel sheet has a structure consisting of ferrite, at most 10% of austenite, and precipitates comprising eutectic precipitates of TiB, the volume fraction of TiBprecipitates with respect to the whole structure being of at least 9%, the proportion of TiBprecipitates having a surface area lower than 8 &#x3bc;mbeing of at least 96%.

High formability steel sheet for the manufacture of lightweight structural parts and manufacturing process

The subject of the invention is a process for the continuous casting of an austenitic stainless steel strip directly from liquid metal of composition, expressed in percentages by weight: C.ltoreq.0.08%, Si.ltoreq.1%; Mn.ltoreq.2%; P.ltoreq.0.045%; S.ltoreq.0.030%; Cr between 17.0 and 20.0%; Ni between 8.0 and 10.5% on a machine for casting onto one or between two moving walls whose external surface is provided with dimples and in which the region surrounding the meniscus is inerted with an inerting gas of controlled composition, wherein:

Process for the continuous casting of an austenitic stainless steel

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Saulny, France

Manuel Bobadilla