Hot rolled dual phase steel sheet, and method of making the...

C - Chemistry – Metallurgy – 21 – D

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C21D 7/13 (2006.01) C22C 38/00 (2006.01)

Patent

CA 2731492

A hot rolled steel sheet having a dual phase microstructure with a martensite phase of less than 35 % by volume and a ferrite phase of more than 50 % by vol-ume and a composition containing by percent weight 0 01 <C<=02,03<=Mn<=3,02<=Si <=2,02<=Cr+Ni<=2, 0 01<= Al <= 0 10, Mo less than about 0 2%, 0 0005 <= Ca <= 0 01, with the balance iron and incidental ingredients Hot rolled sheet for cold rolling, the silicon range may be from about 0 05 % to about 2 %, and the amount of molybde-num may be up to 0 5 % Also, the hot rolled steel sheet has a tensile strength of at least 500 megapascals, a hole expansion ratio more than about 50 %, and a yield strength/tensile strength ratio less than 70 %

Linvention concerne une tôle dacier laminée à chaud présentant une microstructure biphase comprenant une phase martensitique inférieure à 35 % en volume et une phase ferritique supérieure à 50 % en volume et une composition contenant en pourcentage en poids : 0,01 = C = 0,2; 0,3 = Mn = 3; 0,2 = Si = 2; 0,2 = Cr + Ni = 2; 0,01= Al = 0,10; Mo inférieur à environ 0,2 %, 0,0005 = Ca = 0,01, le reste étant du fer et des ingrédients non intentionnels. Pour la tôle laminée à chaud pour laminage à froid, la plage de silicium peut aller denviron 0,05 % à environ 2 %, et la quantité de molybdène peut aller jusquà 0,5 %. De même, la tôle dacier laminée à chaud présente une résistance à la traction dau moins 500 mégapascals, un taux K.W.I. supérieur à environ 50 %, et un rapport limite apparente délasticité/résistance à la traction inférieur à 70 %.

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