Cold rolled steel sheet
AssigneeJfe Steel Corporation
InventorsKatsuya Hoshino, Shinji Ootsuka, Takayoshi Yano
Life of this patent
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Abstract
In order to obtain a cold rolled steel sheet having excellent press formability, a cold rolled steel sheet has an inorganic film containing a crystalline layered material having an average film thickness of 10 nm to 2000 nm on a surface thereof. The crystalline layered material preferably is, for example, a layered double hydroxide represented by [M2+1−XM3+X(OH)2][An−]x/n.zH2O, where: M2+ is one or more of Mg2+, Ca2+, Fe2+, Ni2+, and Zn2+; M3+ is one or more of Al3+, Fe3+, and Cr3+; and An− is one or more of OH−, CO32−, Cl−, and (SO4)2−.
Claims2
A cold rolled steel sheet comprising an inorganic film containing a crystalline layered material on a surface thereof, wherein the inorganic film has an average film thickness of 10 nm to 2000 nm, wherein the crystalline layered material is a layered double hydroxide represented by [M2+1-XM3+X(OH)2][An−]x/n.zH2O, wherein:
- M2+ is one or more of Ca2+, Zn2+, Pb2+, and Sn2+;
- M3+ is one or more of Cr3+, 3/4Zr4+, and Mo3+;
- and
- An− is one or more of F−, Cl−, Br−, (C2O4)2−, I−, (NO3)−, (SO4)2−, (BrO3)−, (IO3)−, (V10O28)6−, (Si2O5)2−, (ClO4)−, (CH3COO)−, [C6H4(CO2)2]2−, (C6H5COO)−, [C8H16(CO2)2]2−, n(C8H17SO4)−, n(C12H25SO4)−, n(C18H37SO4)−, and SiO44−,
- and wherein 0<x≦0.33, 1≦n≦2, and 0.33≦z≦1.
A cold rolled steel sheet comprising an inorganic film containing a crystalline layered material on a surface thereof, wherein the inorganic film has an average film thickness of 10 nm to 2000 nm, wherein the crystalline layered material is a layered double hydroxide represented by [M2+1-XM3+X(OH)2][An−]x/n.zH2O, wherein:
- M2+ is one or more of Ca2+ and Zn2+;
- M3+ is Cr3+;
- and
- An− is one or more of Cl− and (SO4)2−,
- and wherein 0<x≦0.33, 15≦n≦2, and 0.33≦z≦1.
Dependencies are inferred from the claim text.