Process for producing an at least partly quenched and tempered sheet steel component and at least partly quenched and tempered sheet steel component

An at least partly quenched and tempered sheet steel component, wherein the at least partly quenched and tempered sheet steel component has regions having different properties:

• a first region having a first property, comprising a microstructure having a wt % with residual austenite between 3% and <35%, 35% to 97% martensite, up to 30% bainite and unavoidable structure constituents, and at least one further region having a further property, comprising at least one of the following properties:
• a second region having a second property, comprising a structure having a residual austenite fraction which is lower by comparison with the first region, balance martensite and optionally bainite and unavoidable structure constituents;
• a third region having a third property, comprising a structure having a residual austenite fraction which is lower by comparison with the first region and, if present, by comparison with the second region, balance martensite and optionally bainite and unavoidable structure constituents;
• and
• a fourth region having a fourth property, comprising a structure having <3% residual austenite, balance martensite and optionally bainite and unavoidable structure constituents;
• wherein the at least partly quenched and tempered sheet steel component comprises the following chemical composition in wt %:
• C=0.08 to 0.5;
• Si+Al>0.75, and/or Si+2*Al<5, wherein the Si is at least 0.1;
• Mn=0.5 to 4;
• and
• Cr up to 1.5;
• balance Fe and unavoidable impurities.