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US 12,480,177 B2Granted
Galvanized steel sheet and method for producing same
AssigneeJfe Steel Corporation
InventorsSatoshi Maeda, Nao Kawabe, Hiromi Yoshitomi
Life of this patent
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Abstract
To provide a galvanized steel sheet having high strength; specifically, with a tensile strength of 1160 MPa or more and excellent resistance spot weldability. A chemical composition of a base steel sheet contains one or more of Ti, Nb, V, and Zr: 0.02% or more and 0.20% or less in total, and an amount of diffusible hydrogen in a zinc or zinc alloy coating layer is 0.40 mass ppm or less.
Claims12
A galvanized steel sheet having a base steel sheet and a zinc or zinc alloy coating layer on a surface of the base steel sheet, the base steel sheet comprising:
- a chemical composition containing, in mass %,
- C:
- 0.08% or more and 0.30% or less,
- Si:
- less than 2.0%,
- Mn:
- 1.5% or more and 3.5% or less,
- P:
- 0.010% or less,
- S:
- 0.010% or less,
- Al:
- 0.10% or less,
- N:
- 0.006% or less, and
- at least one of Ti, Nb, V and Zr:
- 0.02% or more and 0.20% or less in total, with the balance being Fe and inevitable impurities,
- wherein an amount of diffusible hydrogen in the zinc or zinc alloy coating layer is 0.40 mass ppm or less,
- a tensile strength of the galvanized steel sheet is 1160 MPa or more, and
- a coating weight of the zinc or zinc alloy coating layer is 48 g/m2 to 120 g/m2 per side.
17 more elements
Dependencies are inferred from the claim text.