Sheet metal component, produced by hot working flat steel product, and method for production thereof

Abstract

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 * %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 least200 degrees centigrade and at most 800 degrees centigrade, and subsequently shaped to form the component by hot working the flat steel product heated to the heating temperature, wherein the structureof 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.

Description

technical field [0001] The invention relates to a sheet metal component produced by hot forming a flat steel product. [0002] Furthermore, the invention relates to a method for producing the component according to the invention. [0003] If information is given here about the alloy content of the individual elements in the steel according to the invention, it is always relative to weight (expressed in % by weight) unless otherwise stated. [0004] In contrast, data on the structural composition of steel, flat steel products or components formed therefrom are always volume-dependent (expressed in vol. %). If mentioned, here, the proportion of austenite is measured by X-ray diffraction (XRD) with iron-filtered Co-Kα rays. The X-ray diffraction measurement method is described in the following sources: DIN EN 13925 - X-ray diffraction of polycrystalline and amorphous materials, Parts 1 and 2 of the 2003_7 edition, Part 3 of the 2005 edition. If mentioned, other structural comp...

AI Technical Summary

Problems solved by technology

The problem here is that, due to the high austenitization temperature, it is not possible to cathodically protect the plate by a metal anti-corrosion coating

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