Coated steel sheet
AssigneeNippon Steel Corporation
InventorTakuya Mitsunobu
Life of this patent
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Abstract
A coated steel sheet including a steel sheet and a coating layer provided on at least part of the surface of the steel sheet, in which the coating layer has a predetermined chemical composition in terms of % by mass, and the coating layer has a granular Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al, and the granular Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a granular Mg2Sn phase having a crystal grain size of less than 1 μm dispersed in the Zn phase.
Claims18
A coated steel sheet comprising a steel sheet and a coating layer provided on at least a part of a surface of the steel sheet, wherein:
- the coating layer has a chemical composition comprising in terms of % by mass:
- Al:
- from 15% to 60%
- Mg:
- from 0.5% to 8.0%
- Sn:
- from 0.5% to 20.0%
- Si:
- from 0.05% to 1.50%
- Bi:
- from 0% to 5.0%,
- In:
- from 0% to 2.0%,
- Ca:
- from 0% to 3.0%,
- Y:
- from 0% to 0.5%,
- La:
- from 0% to 0.5%,
- Ce:
- from 0% to 0.5%,
- Cr:
- from 0% to 0.25%,
- Ti:
- from 0% to 0.25%,
- Ni:
- from 0% to 0.25%,
- Co:
- from 0% to 0.25%,
- V:
- from 0% to 0.25%,
- Nb:
- from 0% to 0.25%,
- Cu:
- from 0% to 0.25%,
- Mn:
- from 0% to 0.25%,
- Sr:
- from 0% to 0.5%,
- Sb:
- from 0% to 0.5%,
- Pb:
- from 0% to 0.5%,
- B:
- from 0% to 0.5%, and
- a balance comprising Zn and impurities, wherein:
- the coating layer has a granular Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al, and
- the granular Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a granular Mg2Sn phase having a crystal grain size of less than 1 μm dispersed in the Zn phase.
Dependencies are inferred from the claim text.