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US 11,028,469 B2Granted
Hot press-formed part
AssigneeNippon Steel Corporation
InventorsMutsumi Sakakibara, Natsuko Sugiura, Kunio Hayashi, Kaoru Kawasaki
Life of this patent
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Abstract
A hot press-formed part according to an aspect of the present invention contains a predetermined chemical composition; in which a microstructure in a thickness ¼ portion includes, by unit vol %, tempered martensite: 20% to 90%, bainite: 5% to 75%, and residual austenite: 5% to 25%, and ferrite is limited to 10% or less; and a pole density of an orientation {211}<011> in the thickness ¼ portion is 3.0 or higher.
Claims16
A hot press-formed part comprising, by unit mass %,
- C:
- 0.100% to 0.600%,
- Si:
- 1.00% to 3.00%,
- Mn:
- 1.00% to 5.00%,
- P:
- 0.040% or less,
- S:
- 0.0500% or less,
- Al:
- 0.001% to 2.000%,
- N:
- 0.0100% or less,
- O:
- 0.0100% or less,
- Mo:
- 0% to 1.00%,
- Cr:
- 0% to 2.00%,
- Ni:
- 0% to 2.00%,
- Cu:
- 0% to 2.00%,
- Nb:
- 0% to 0.300%,
- Ti:
- 0% to 0.300%,
- V:
- 0% to 0.300%,
- B:
- 0% to 0.1000%,
- Ca:
- 0% to 0.0100%,
- Mg:
- 0% to 0.0100%,
- REM:
- 0% to 0.0100%, and
- a remainder including Fe and impurities,
- wherein a microstructure in a thickness ¼ portion includes, by unit vol %, tempered martensite:
- 20% to 90%, bainite:
- 5% to 75%, and residual austenite:
- 5% to 25%, and ferrite is limited to 10% or less,
- wherein a pole density of an orientation {211}<011> in the thickness ¼ portion is 3.0 or higher, and
- a tensile strength TS is 1.200 MPa or higher,
- a tensile product TSxEl is 26.000 MPa % or higher,
- both an r value for a rolling direction and an r value for a transvers direction is 0.80 or smaller, and
- both limitation of bending (R/t) in the rolling direction and limitation of bending (R/t) in the transvers direction is 2,0 or smaller.
45 more elements
Dependencies are inferred from the claim text.