High toughness press-hardened steel part and method of manufacturing the same
AssigneeArcelorMittal
InventorsClément Philippot, Alice Dumont
Life of this patent
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Abstract
A steel sheet and press hardened steel part having a composition including, by weight percent: C 0.05-0.4%, Mn 0.5-4%, Si 0.1-1.3%, Al 0.01-0.1%, Cr 0.01-1.0%, Ti 0.01-0.1%, B 0.0005-0.08%, Cu 0.05-0.4%, Sn 0.002-0.1%, P≤0.020%, S≤0.010%, N≤0.02% the remainder of the composition being iron and unavoidable impurities resulting from the smelting process and depending on the process route. The press hardened steel part has a microstructure including, in surface fraction, more than 95% of martensite, the rest being optional bainite and retained austenite.
Claims10
A press hardened steel part made of steel having a composition comprising, by weight percent:
- C
- :
- 0.062
- -
- 0.095
- %
- Mn
- :
- 1.4
- -
- 1.9
- %
- Si
- :
- 0.2
- -
- 0.5
- %
- Al
- :
- 0.02
- -
- 0.07
- %
- Cr
- :
- 0.02
- -
- 0.1
- %
- wherein
- 1.5
- %
- ≤
- (
- C
- +
- Mn
- +
- Si
- +
- Cr
- )
- ≤
- 2.7
- Nb
- :
- 0.04
- -
- 0.06
- %
- Ti
- :
- 0.01
- -
- 0.1
- %
- B
- :
- 0.0005
- -
- 0.004
- %
- Cu
- :
- 0.05
- -
- 0.4
- %
- Sn
- :
- 0.002
- -
- 0.1
- %
- S
- ≤
- 0.003
- %
- P
- ≤
- 0.02
- %
- N
- ≤
- 0.009
- %
- and comprising optionally one or more of the following elements, in weight percent:
- 0.0001≤Ca≤0.003%
- a remainder of the composition being iron and unavoidable impurities resulting from processing,
- the steel part having a microstructure comprising, in surface fraction, more than 95% of martensite, a rest being optional bainite and/or optional retained austenite,
- the steel part having a tensile strength TS of between 950 and 1491 MPa.
Dependencies are inferred from the claim text.