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US 2026/0168079 A1Published application
Method of producing a phosphatable part from a sheet coated with an aluminum-based coating and a zinc coating
AssigneeArcelorMittal
InventorsChristian Allely, Eric Jacqueson, Daniel Chaleix
Life of this patent
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Abstract
A steel sheet coated with an aluminum-based coating and a second zinc coating having a thickness less than or equal to 1.1 μm is provided. A method for preparing the coated steel sheet, a method for preparing a press-hardened part from the steel sheet, a press-hardened part, and the use of the press-hardened part are also provided.
Claims20
A coated steel sheet for press hardening comprising:
- a steel sheet;
- an aluminum-based coating;
- and
- a zinc coating over the aluminum-based coating, the zinc coating having a thickness less than or equal to 1.1 μm, the zinc coating being primarily zinc;
- the coated steel sheet having a weight composition as follows:
- 0.03
- %
- ≤
- C
- ≤
- 0.5
- %
- ;
- 0.3
- %
- ≤
- Mn
- ≤
- 3.
- %
- ;
- 0.05
- %
- ≤
- Si
- ≤
- 0.8
- %
- ;
- 0.015
- %
- ≤
- Ti
- ≤
- 0.2
- %
- ;
- 0.005
- %
- ≤
- Al
- ≤
- 0.1
- %
- ;
- 0
-
- %
- ≤
- Cr
- ≤
- 2.5
- %
- ;
- 0
-
- %
- ≤
- S
- ≤
- 0.05
- %
- ;
- 0
-
- %
- ≤
- P
- ≤
- 0.1
- %
- ;
- 0
-
- %
- ≤
- B
- ≤
- 0.01
- %
- ;
- 0
-
- %
- ≤
- Ni
- ≤
- 2.5
- %
- ;
- 0
-
- %
- ≤
- Mo
- ≤
- 0.7
- %
- ;
- 0
-
- %
- ≤
- Nb
- ≤
- 0.15
- %
- ;
- 0
-
- %
- ≤
- N
- ≤
- 0.015
- %
- ;
- 0
-
- %
- ≤
- Cu
- ≤
- 0.15
- %
- ;
- 0
-
- %
- ≤
- Ca
- ≤
- 0.01
- %
- ;
- 0
-
- %
- ≤
- W
- ≤
- 0.35
- %
- ,
- the balance of the composition comprising iron and unavoidable impurities resulting from the process.
142 more elements
A coated steel sheet for press hardening comprising:
- a steel sheet;
- an aluminum-based coating;
- and
- a zinc coating over the aluminum-based coating, the zinc coating having a thickness less than or equal to 1.1 μm, the zinc coating being primarily zinc;
- the coated steel sheet having a composition enabling press hardening into a part having a tensile strength greater than or equal to 500 MPa.
2 more elements
A coated steel sheet for press hardening comprising:
- a steel sheet;
- an aluminum-based coating;
- and
- a zinc coating over the aluminum-based coating, the zinc coating having a thickness less than or equal to 0.5 μm, the zinc coating being primarily zinc.
1 more element
Dependencies are inferred from the claim text.