| 简介 |
The invention relates to a sheet metal component and a method for producing sheet metal components of this type, which enables an energy saving in comparison with conventionally produced sheet metal components due to lower shaping temperatures, allows for an increased residual stress at high strengths, and whereby a highest possible potential is maintained for cathodic corrosion protection. The sheet metal component according to the invention consists of (in wt.%) C : up to 0.5 %, Si : 0.05 - 1 %, Mn : 4 - 12 %, Cr : 0.1 - 4 %, AI : up to 3.5 %, N : up to 0.05 %, P : up to 0.05 %, S : up to 0.01 %, Cu, Ni : in total up to 2 %, Ti, Nb, V : in total up to 0.5 %, rare-earth elements : up to 0.1 %, and the rest being Fe and unavoidable impurities, wherein the C content %C and the Cr content %Cr fulfils the following condition : (10 x %C) + %Cr < 5.5 %. According to the invention, in order to produce a sheet metal component, the flat steel product is heated through to a heating temperature of at least 200°C and at most 800°C , and subsequently shaped to form the component by hot working the flat steel product heated to the heating temperature, wherein the structure of the hot-worked sheet metal component consists of 5 - 50 vol.% austenite and the rest being martensite, tempered martensite or ferrite, wherein the ferrite-portion can also be 0, and wherein the average grain diameter of the grains of the structure is less than 5 pm. |
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