Steel part having high strength and high bendability
OwnerSebastian COBO, Matthieu SALIBinventors
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Abstract
Steel part having a chemical composition comprising, by weight %, 0.18≤C≤0.27, 0.18≤Si≤0.30, 1.0≤Mn≤1.5, 0.14≤Cr≤0.25, 0.02≤Al≤0.06, 0.02≤Ti≤0.06, 0.0020≤B≤0.0040, 0≤S≤0.008, 0≤N≤0.020, the remainder of the composition being iron and unavoidable impurities resulting from the elaboration process, having a microstructure including, in surface fraction, 95% or more of martensite, the steel part having an ultimate tensile strength equal to or above 1350 MPa in the transverse direction, and a bending angle normalized to 1.5 mm thickness equal to or above 57° in the transverse direction.
Claims14
A steel part having a chemical composition comprising, by weight %:
- 0.18
- ≤
- C
- ≤
- 0.27
- 0.18
- ≤
- Si
- ≤
- 0.3
- 1.
- ≤
- Mn
- ≤
- 1.5
- 0.14
- ≤
- Cr
- ≤
- 0.25
- 0.02
- ≤
- Al
- ≤
- 0.06
- 0.02
- ≤
- Ti
- ≤
- 0.06
- 0.0015
- ≤
- B
- ≤
- 0.004
- 0
- ≤
- S
- ≤
- 0.008
- 0
- ≤
- P
- ≤
- 0.04
- 0
- ≤
- N
- ≤
- 0.02
- 0
- ≤
- Mo
- ≤
- 0.3
- 0
- ≤
- Nb
- ≤
- 0.1
- 0
- ≤
- V
- ≤
- 0.3
- 0
- ≤
- Cu
- ≤
- 0.25
- 0
- ≤
- Ni
- ≤
- 0.25
- 0
- ≤
- Sn
- ≤
- 0.05
- 0
- ≤
- As
- ≤
- 0.03
- 0
- ≤
- Sb
- ≤
- 0.03
- 0
- ≤
- Pb
- ≤
- 0.03
- a remainder of the composition being iron and unavoidable impurities resulting from processing;
- and
- a microstructure comprising, in surface fraction, 95% or more of martensite,
- the steel part having an ultimate tensile strength equal to or above 1350 MPa in the transverse direction, and a bending angle normalized to 1.5 mm thickness equal to or above 57° in the transverse direction.
Dependencies are inferred from the claim text.