Arcelormittal

Ugitech

Arcelormittal Investigacion Y Desarrollo, S.l.

Amelie Fanica

Christophe Bourgin

Marc Mantel

Nicolas Renaudot

Eric Chauveau

Jerome Peultier

Bernard Bonnefois

Tassa Oriana

Johannes Cornelis Van Wortel

Lionel Coudreuse

A hot rolled plate or forging of an austenitic steel not susceptible to relaxation cracking is provided. The hot rolled plate or austenitic steel includes a composition having in percentages by weight: 0.019%≤C≤0.030%, 0.5%≤Mn≤2%, 0.1%≤Si≤0.75%, Al≤0.25%, 18%≤Cr≤25%, 14%≤Ni≤17%, 1.5%≤Mo≤3%, 0.001%≤B≤0.008%, 0.25%≤V≤0.35%, 0.23%≤N≤0.27%, the balance being iron and unavoidable impurities, Ni(eq.)≥1.11 Cr(eq.)−8.24, Cr(eq)=Cr+Mo+1.5Si+5V+3Al+0.02, Ni(eq)=Ni+30C+x(N−0.045)+0.87; x=30 for N≤0.2, x=22 for 0.2<N≤0.25, x=20 for 0.25<N≤0.35.

Hot rolled plate or forging of an austenitic steel

A method for manufacturing a plate, a band, or a coil of hot-rolled steel is provided. The method includes providing an ingot or a slab of steel with a desired composition and a microstructure composed of austenite and 35 to 65% ferrite by volume and hot rolling the ingot or slab at a temperature between 1150 and 1280&#xb0; C. to obtain a plate, a band or a coil. A method for manufacturing a hot-rolled bar or wire of steel, a steel profile and a forged steel piece are also provided.

Method for manufacturing austenite-ferrite stainless steel with improved machinability

The present invention provides an austenite-ferrite stainless steel. The steel composition contains in % by weight:

Austenite-ferrite stainless steel of improved machinability

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Cersot, France

Amelie Fanica