Steel sheet for producing press-hardened parts, press-hardened parts having a combination of high strength and collapsible ductility, and methods for their production

摘要

Steel plate for the production of press-hardened parts, wherein 0.15%≦C≦0.22%, 3.5%≦Mn4.2%, 0.001%≦Si≦1.5%, 0 0.020%≦Al≦0.9%, 0.001%≦Cr≦1%, 0.001%≦Mo≦0.3%, 0.001%≦Ti≦0.040%, 0.0003%≦ B≦0.004%, 0.001%≦Nb≦0.060%, 0.001%≦N≦0.009%, 0.0005%≦S≦0.003%, 0.001%≦P≦ Cementite having a composition including 0.020%, a microstructure of less than 50% ferrite, 1% to 20% retained austenite, and an areal density of cementite particles greater than 60 nm lower than 10^7/mm2. A steel sheet comprising a balance of bainite and/or martensite, the retained austenite having an average Mn content of at least 1.1*Mn%. A press-hardened steel component obtained by hot forming this steel sheet, and a method for producing them.