TWIP steel sheet having an austenitic matrix
AssigneeArcelorMittal
InventorsColin Scott, Blandine Remy
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Abstract
A TWIP steel sheet is provided having an austenitic matrix including by weight: 0.1≤C≤1.2%, 13.0≤Mn<25.0%, 0.1≤Si≤3.0%, 0.1≤Cu≤5.0%, S≤0.030%, P≤0.080%, N≤0.1%, 0.1≤Al≤4.0% and 0.1≤V≤2.50% in such way that:—when the amount of Al<2.0%, the weight ratio Al/V is between 0.2 and 8 or—when the amount of Al≥2.0%, the amount of V>0.25%, and on a purely optional basis, one or more of Nb≤0.5%, B≤0.005%, Cr≤1.0%, Mo≤0.40%, Ni≤1.0%, Ti≤0.5%, and/or 0.06≤Sn≤0.2%, the remainder of the composition being made of iron and inevitable impurities resulting from elaboration.
Claims26
A cold rolled and recovered TWIP steel sheet having an austenitic matrix comprising by weight:
- 0.1≤C≤1.2%,
- 13.0≤Mn<25.0%,
- 0.1≤Si≤3.0%,
- 0.1≤Cu≤5.0%,
- S≤0.030%,
- P≤0.080%,
- N≤0.1%,
- 0.1≤Al≤4.0% and
- 0.1≤V≤2.50% in such way that:
- when the amount of Al<2.0%, the weight ratio Al/V is between 0.2 and 8 or
- when the amount of Al≥2.0%, the amount of V>0.25%,
- and optionally one or more of the following elements:
- Nb≤0.5%,
- B≤0.005%,
- Cr≤1.0%,
- Mo≤0.40%,
- Ni≤1.0%,
- Ti≤0.5%, and
- 0.06≤Sn≤0.2%;
- the remainder of the composition being made of iron and inevitable impurities resulting from elaboration, the steel sheet having a microstructure with a recovered fraction greater than a recrystallized fraction.
Dependencies are inferred from the claim text.