Steel-sheet product and steel component produced by forming such a steel-sheet product

Abstract

The invention relates to steel-sheet products produced from steel and provided for cold forming. Said steel-sheet products have an optimum combination of weldability and little tendency to form crackslater on as well as good strength and hot- and cold-formability. A steel-sheet product according to the invention is coated with an Zn coating the base of which is zinc and which contains, in addition to the constituents introduced into the Zn coating as a result of the production process, optionally in each case 5 - 20 wt% Ni or Mo, the steel substrate of the sheet-steel product consisting of steel that contains as the required constituents (in wt%) C: 0.1 - 1.0%, Mn: 10 - 30%, AI: 0.3 - 2.5% and remainder iron and unavoidable impurities and that can contain as an optional constituent one ormore of the following elements with the proviso that Ni: 0.1 - 2%, Mo: 0.1 - 2%, Si: up to 3%, Cr, Cu: each up to 5%, P: up to 0.1%, S: up to 0.03%, Ti, Nb, V, Zr, Co: each up to 0.5%, W: up to 0.5%,Sn, Sb, As: in total up to 0.5%, Ca: up to 0.015%, B: up to 0.1%, SEM: up to 1%, N: up to 0.1%. The compositions of the Zn coating and of the steel substrate are matched to each other such that the amount of the average potential difference between the Zn coating and the steel substrate is not more than 0.44 V.

Description

technical field [0001] The invention relates to a flat steel product produced from high-strength steel with a high manganese content, which is suitable for forming and has good resistance to crack formation induced by free hydrogen. The steel base plate of the flat steel product is coated with Zn for corrosion protection. [0002] Furthermore, the invention relates to a steel component which is produced by forming such a flat steel product. [0003] Here, when flat steel products are mentioned, this also means steel strips obtained by rolling, steel sheets and slabs, trimmed parts or similar products obtained therefrom. [0004] Whenever data are given here regarding the alloy composition with respect to the content of alloying elements, these data always refer to weight, unless expressly stated otherwise. Background technique [0005] In the steels specified for body components and similar applications and the flat steel products produced therefrom, it must be ensured tha...

AI Technical Summary

Problems solved by technology

Here, the problem of avoiding delayed cracking due to the presence of hydrogen in the steel substrate is not addressed

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