Flat steel product having an al-coating, process for production thereof, steel component and process for production thereof
AssigneeThyssenKrupp Steel Europe AG
InventorsDavid HOFFMANN, Oliver MOLL
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Abstract
The invention relates to a flat steel product for hot forming, consisting of a steel substrate which consists of a steel having 0.1-3 wt % of Mn and optionally up to 0.01 wt % of B, and of an Al-based protective coating applied to the steel substrate. The iron-free mass fraction in the protective coating of Mg as additional alloy constituent adds up to less than 2.50% Mg. In addition, the iron-free mass fraction in the protective coating of Mn as additional alloy constituent adds up to more than 0.30% Mn and the iron-free mass fraction in the protective coating of Si as additional alloy constituent adds up to less than 1.80%.
Claims14
A flat steel product for hot forming, comprising a steel substrate comprising a steel which, as well as iron and unavoidable impurities, comprises (in wt %):
- C:
- 0.04-0.45 wt %,
- Si:
- 0.02-1.2 wt %,
- Mn:
- 0.5-2.6 wt %,
- Al:
- 0.02-1.0 wt %,
- P:
- ≤0.05 wt %,
- S:
- ≤0.02 wt %,
- N:
- ≤0.02 wt %,
- Sn:
- ≤0.03 wt %
- As:
- ≤0.01 wt %
- Ca:
- ≤0.005 wt %
- and of an Al-based protective coating applied to the steel substrate, where the iron-free mass fraction of the aluminum-based protective coating includes a total of up to 10% of additional alloy constituents and the rest of the iron-free mass fraction is formed from aluminum, where the iron-free mass fraction in the protective coating of Mg as additional alloy constituent adds up to less than 0.10-0.50 wt % of Mg, wherein the iron-free mass fraction in the protective coating of Mn as additional alloy constituent adds up to more than 0.30% Mn and the iron-free mass fraction in the protective coating of Si as additional alloy constituent adds up to less than 1.80%.
A metallurgically bonded steel component, having a thickness of the Fe seam of greater than 2.5 μm, comprising a steel substrate comprising a steel which, as well as iron and unavoidable impurities, comprises (in wt %):
- C:
- 0.04-0.45 wt %,
- Si:
- 0.02-1.2 wt %,
- Mn:
- 0.5-2.6 wt %,
- Al:
- 0.02-1.0 wt %,
- P:
- ≤0.05 wt %,
- S:
- ≤0.02 wt %,
- N:
- ≤0.02 wt %,
- Sn:
- ≤0.03 wt %
- As:
- ≤0.01 wt %
- Ca:
- ≤0.005 wt %
- and of an Al-based protective coating (15) applied to the steel substrate, where the iron-free mass fraction of the aluminum-based protective coating optionally includes a total of up to 10% of additional alloy constituents and the rest of the iron-free mass fraction is formed from aluminum, where the iron-free mass fraction in the protective coating of Mg as additional alloy constituent adds up to less than 0.10-0.50 wt % of Mg, wherein the iron-free mass fraction in the protective coating of Mn as additional alloy constituent adds up to more than 0.30% Mn and the iron-free mass fraction in the protective coating of Si as additional alloy constituent adds up to less than 1.80%.
Dependencies are inferred from the claim text.