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US 12,180,573 B2Granted
Hot-stamping formed body
AssigneeNippon Steel Corporation
InventorsShingo Fujinaka, Yuri Toda, Daisuke Maeda
Life of this patent
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Abstract
A hot-stamping formed body has a predetermined chemical composition, in which an average grain size of prior austenite grains in a microstructure is 5.0 μm or less, and an average Mn concentration at grain boundaries of the prior austenite grains is 1.0 mass % or less. The hot-stamping formed body may be provided with a plating layer on the surface thereof, or may have a softened region in a portion thereof.
Claims8
A hot-stamping formed body comprising, as a chemical composition, by mass %:
- C:
- 0.40% to 0.70%;
- Si:
- 0.010% to 1.30%;
- Mn:
- 0.40% to 3.00%;
- sol. Al:
- 0.0010% to 0.500%;
- Ti:
- 0.010% to 0.100%;
- Cr:
- 0.010% to 0.80%;
- B:
- 0.0005% to 0.0100%;
- P:
- 0.100% or less;
- S:
- 0.0100% or less;
- N:
- 0.0100% or less;
- Nb:
- 0% to 0.100%;
- Mo:
- 0% to 1.00%;
- V:
- 0% to 0.100%;
- Ni:
- 0% to 0.50%;
- REM:
- 0% to 0.0100%;
- Mg:
- 0% to 0.0100%;
- Ca:
- 0% to 0.0100%;
- Co:
- 0% to 4.00%;
- and
- a remainder consisting of Fe and impurities,
- wherein an average grain size of prior austenite grains in a microstructure is 5.0 μm or less, and
- an average Mn concentration at grain boundaries of the prior austenite grains is 1.0 mass % or less.
37 more elements
A hot-stamping formed body comprising, as a chemical composition, by mass %:
- C:
- 0.40% to 0.70%;
- Si:
- 0.010% to 1.30%;
- Mn:
- 0.40% to 3.00%;
- sol. Al:
- 0.0010% to 0.500%;
- Ti:
- 0.010% to 0.100%;
- Cr:
- 0.010% to 0.80%;
- B:
- 0.0005% to 0.0100%;
- P:
- 0.100% or less;
- S:
- 0.0100% or less;
- N:
- 0.0100% or less;
- Nb:
- 0% to 0.100%;
- Mo:
- 0% to 1.00%;
- V:
- 0% to 0.100%;
- Ni:
- 0% to 0.50%;
- REM:
- 0% to 0.0100%;
- Mg:
- 0% to 0.0100%;
- Ca:
- 0% to 0.0100%;
- Co:
- 0% to 4.00%;
- and
- a remainder comprising Fe and impurities,
- wherein an average grain size of prior austenite grains in a microstructure is 5.0 μm or less, and
- an average Mn concentration at grain boundaries of the prior austenite grains is 1.0 mass % or less.
37 more elements
Dependencies are inferred from the claim text.