Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1991-02-20
1994-07-05
Fuller, Benjamin R.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428659, B32B 514, B32B 1518
Patent
active
053266480
ABSTRACT:
A zinc or zinc-alloy plated steel sheet having an improved weldability and plating properties, as well as a method for making the same is provided. Even when the substrate steel sheet is the one which is difficult to deposit a zinc or zinc-alloy layer by conventional methods, such as an extra low carbon steel sheet, the present invention enable a reliable production of a galvanized steel sheet suffering from no plating failure or insufficient adhesion as well as a reliable production of a galvannealed steel sheet suffering from no plating failure or streaking of the alloyed layer.
The zinc or zinc-alloy plated steel sheet having improved weldability comprises an extra low carbon steel sheet, an iron-carbon plated layer or a carbon-rich layer generated by diffusion of the iron-carbon plated layer on at least one major surface of the extra low carbon steel sheet, and a zinc or zinc-alloy plated layer on the iron-carbon plated layer or the carbon-rich layer.
The zinc or zinc-alloy plated steel sheet having improved weldability and/or plating properties is produced by depositing on the steel sheet an iron-carbon plated layer having a carbon content of from 0.01% by weight to 10% by weight to a coating weight of from 0 01 g/m.sup.2 to 10 g/m.sup.2, optionally annealing the iron-carbon plated steel sheet, and depositing a zinc or zinc-alloy plated layer, preferably by galvanizing or galvannealing, on the annealed steel sheet.
REFERENCES:
patent: 1501887 (1924-07-01), Crapo
patent: 1726652 (1929-09-01), Crapo
patent: 4908073 (1990-03-01), Sato et al.
patent: 5019460 (1991-05-01), Yasuda et al.
Merriman, "A Dictionary of Metallurgy", 1958, p. 339.
Japanese Patent Appln. Kokai No. 2-384549-Laid-Open date: Feb. 7, 1990.
Japanese Patent Appl. No. 63-186394, filed Jul. 26, 1988.
Kato Chiaki
Kimura Hajime
Morito Nobuyuki
Uesugi Yasuji
Yasuda Akira
Fuller Benjamin R.
Kawasaki Steel Corporation
Lund Valerie Ann
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