Method for producing a steel component provided with a coating, and steel component
AssigneesThyssenKrupp Steel Europe AG, thyssenkrupp AG
InventorsManuela Ruthenberg, Maria Koyer
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Abstract
The present disclosure provides a steel component produced from a steel substrate coated with anticorrosion coating. The steel component comprises a steel substrate and, at least on one side of the steel substrate, an anticorrosion coating which comprises at least one first and one second silicon-rich layer (Si1, Si2) and also one first and one second low-silicon layer (A, B). A quotient X formed from a thickness (dB) of the second low-silicon layer (B) in μm by a thickness (dA) of the first low-silicon layer (A) in μm is at least 0.4 and at most 1.1.
Claims20
A steel component comprising a steel substrate and, at least on one side of the steel substrate, an anticorrosion coating, wherein the steel substrate is heat-treated to change the composition of the anticorrosion coating to at least comprise:
- a first silicon-rich layer (Si1) which besides unavoidable impurities contains more than 4 and up to 8 wt % of Si, 40-70 wt % of Fe, up to 1 wt % of Mn and 30-60 wt % of aluminum, the sum of the constituents present being 100 wt %, and which is located above a first low-silicon layer (A);
- the first low-silicon layer (A) which besides unavoidable impurities contains 1-4 wt % of Si, 30-60 wt % of Fe, up to 1 wt % of Mn and 40-60 wt % of aluminum, the sum of the constituents present being 100 wt %, and which is located between the first silicon-rich layer (Si1) and a second silicon-rich layer (Si2);
- the second silicon-rich layer (Si2) which besides unavoidable impurities contains at least 5 and up to 8 wt % of Si, 40-70 wt % of Fe, up to 1 wt % of Mn and 20-50 wt % of aluminum, the sum of the constituents present being 100 wt %, and which is located between the first low-silicon layer (A) and a second low-silicon layer (B);
- the second low-silicon layer (B) which besides unavoidable impurities contains 0.5-4 wt % of Si, 40-97 wt % of Fe, 0.5-1.5 wt % of Mn and 2-40 wt % of aluminum, the sum of the constituents present being 100 wt %, and which borders the steel substrate;
- and
- wherein a quotient X formed from the thickness (dB) of the second low-silicon layer (B) in μm by the thickness (dA) of the first low-silicon layer (A) in μm is at least 0.4 and at most 1.1.
The steel component as claimed in 1, wherein the steel substrate consists of a steel material with 0.10-0.25 wt % of C, 1.0-1.4 wt % of Mn, 0.35-0.4 wt % of Si, up to 0.03 wt % of P, up to 0.01 wt % S, up to 0.040 wt % of Al, up to 0.15 wt % of Ti, up to 0.1 wt % of Nb, up to 0.005 wt % of B, up to 0.5 wt % of Cr, up to 0.5 wt % of Mo, the sum of the amounts of Cr and Mo being at most 0.5 wt %, the balance being iron and unavoidable impurities.
A steel component comprising a steel substrate and, at least on one side of the steel substrate, an anticorrosion coating, wherein the anticorrosion coating consists of:
- an outermost oxide-enriched layer (Ox) in contact with a surrounding atmosphere;
- a first silicon-rich layer containing more than 4 and up to 8 wt % of Si, 40-70 wt % of Fe, up to 1 wt % of Mn and 30-60 wt % of aluminum;
- a second silicon-rich layer being disposed between the first silicon-rich layer and the steel substrate, and containing more than 4 and up to 8 wt % of Si, 40-70 wt % of Fe, up to 1 wt % of Mn and 20-50 wt % of aluminum;
- a first low silicon layer being disposed between the first and second silicon-rich layers, and containing 1-4 wt % of Si, 30-60 wt % of Fe, up to 1 wt % of Mn and 40-60 wt % of aluminum;
- and
- a second low silicon layer being disposed below the second silicon-rich layer and directly on the steel substrate, and containing 0.5-4 wt % of Si, 40-97 wt % of Fe, 0.5-1.5 wt % of Mn and 2-40 wt % of aluminum.
A steel component comprising:
- a steel substrate;
- a heat treated aluminum-based anticorrosion coating disposed on at least one side of the steel substrate;
- wherein a composition of the heat treated aluminum-based anticorrosion coating includes a first silicon-rich layer, which contains more than 4 and up to 8 wt % of Si, that is the outermost layer of the aluminum-based anti-corrosion coating, the anticorrosion coating further including a second silicon-rich layer disposed between the first silicon-rich layer and the steel substrate;
- a first low silicon layer disposed between the first and second silicon-rich layers;
- and a second low silicon layer disposed between the second silicon-rich layer and the steel substrate,
- wherein the second silicon-rich layer contains at least 5 and up to 8 wt % of Si, the first low silicon layer contains 1-4 wt % of Si;
- and the second low silicon layer contains 0.5-4 wt % of Si.
Dependencies are inferred from the claim text.