EP0055481A2
Expired / Lapsed
EP
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Chromium-plated steel strip having excellent weldability and resistance to corrosion and method for producing the same
Assignee: Nippon Steel Corp
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Filing: 1981-12-24
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Granted: —
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Expires: 2001-12-24
Abstract
Abstract A chromium-plated steel strip having an excellent weldability and a satisfactory resistance to corrosion, comprises a steel strip substrate, base layers consisting of an amorphous metallic material, for example, Ni-P or Ni-B alloy, and each having a weight of 3 to 500 mg/m<sup>2</sup>, intermediate layers consisting of tin and each having a weight of 2.8 g/m<sup>2</sup> or less, and surface layers consisting of metallic chromium and hydrated chromium oxide.
Inventors
- 👤 Mitsuo Higashi
- 👤 Jyun-Ichi Morita
- 👤 Kenzi Koyama
- 👤 Mitsuo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:17
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/004; C; C25; C25D; C25D5/00; C25D5/10; C25D5/12; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1646; C23C18/165; C23C18/1653; C23C18/31; C23C18/32; C23C18/34; C23C18/36; C23C28/00; C25D11/00; C25D11/38; C25D3/00; C25D3/02; C25D3/04; C25D5/60; C25D5/615; C25D5/619; C25D7/00; C25D7/06; C25D7/0614; C25D9/00; C25D9/04; C25D9/08; C25D3/56; C25D3/562; Y; Y10; Y10S; Y10S220/00; Y10S220/917; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/1266; Y10T428/12708; Y10T428/12722; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12861; Y10T428/12937; Y10T428/12944
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
90 words
A chromium-plated steel strip having as excellent weldability and resistance to corrosion, comprising: a steel strip substrate; amorphous metal base layers formed on the surfaces of said substrate and having a weight of 3 to 500 mg per m 2 of each surface of said substrate; electroplated tin intermediate layers formed on the surfaces of said base layers and having a weight of 2.8 g or less per m 2 of each surface of said substrate, and; hydrated chromium oxide-containing surface layers coated on the surfaces of said intermediate layers.
Claim 2
Dependent Claim
90 words
A chromium-plated steel strip having as excellent weldability and resistance to corrosion, comprising: a steel strip substrate; amorphous metal base layers formed on the surfaces of said substrate and having a weight of 3 to 500 mg per m 2 of each surface of said substrate; electroplated tin intermediate layers formed on the surfaces of said base layers and having a weight of 2.8 g or less per m 2 of each surface of said substrate, and; hydrated chromium oxide-containing surface layers coated on the surfaces of said intermediate layers.
Claim 3
Dependent Claim
23 words
The chromium-plated steel strip as claimed in claim 1, wherein said amorphous metal base layer consists essentially of a plated amorphous Ni-P alloy.
Claim 4
Dependent Claim
23 words
The chromium-plated steel strip as claimed in claim 1, wherein said amorphous metal base layer consists essentially of a plated amorphous Ni-B alloy.
Claim 5
Dependent Claim
35 words
The chromium-plated steel strip as claimed in claim 1, wherein the weight of said base layer is in the range of from 15 to 50 mg per m 2 of each surface of said substrate.
Claim 6
Dependent Claim
36 words
The chromium-plated steel strip as claimed in claim 1, wherein the weight of said tin intermediate layer is in the range of from 0.2 to 2.8 g per m 2 of each surface of said substrate.
Claim 7
Dependent Claim
44 words
The chromium-plated steel strip as claimed in claim 1, wherein said surface layer comprises 5 to 150 mg of metallic chromium and 3 to 30 mg, in terms of metallic chromium, of hydrated chromium oxide per m 2 of each surface of said substrate.
Claim 8
Independent Claim
102 words
A method for producing a chromium-plated steel strip having an excellent weldability and resistance to corrosion, comprising the step of: pickling the surfaces of a steel strip substrate; plating the pickled surfaces of said substrate with amorphous metal base layers each having a weight of 3 to 500 mg per m 2 of each surface of said substrate; electroplating the surfaces of said base layers with tin intermediate layers each having a weight of 2.8 g or less per m 2 of each surface of said substrate, and, then; coating the surfaces of said intermediate layers with hydrated chromium oxide-containing surface layers.
Claim 9
Independent Claim
102 words
A method for producing a chromium-plated steel strip having an excellent weldability and resistance to corrosion, comprising the step of: pickling the surfaces of a steel strip substrate; plating the pickled surfaces of said substrate with amorphous metal base layers each having a weight of 3 to 500 mg per m 2 of each surface of said substrate; electroplating the surfaces of said base layers with tin intermediate layers each having a weight of 2.8 g or less per m 2 of each surface of said substrate, and, then; coating the surfaces of said intermediate layers with hydrated chromium oxide-containing surface layers.
Claim 10
Dependent Claim
25 words
The process as claimed in claim 7, wherein said descaling procedure is carried out by electrolytically degreasing and, then, pickling said surfaces of said substrate.
Claim 11
Dependent Claim
29 words
The process as claimed in claim 7, wherein said base layer-coating procedure is carried out by electrolytically or chemically plating the surfaces of said substrate with a Ni-P alloy.
Claim 12
Dependent Claim
29 words
The process as claimed in claim 7, wherein said base layer-coating procedure is carried out by electrolytically or chemically plating the surfaces of said substrate with a Ni-B alloy.
Claim 13
Dependent Claim
32 words
The process as claimed in claim 7, wherein the weight of said base layer is in the range of 15 to 50 mg per m 2 of each surface of said substrate.
Claim 14
Dependent Claim
34 words
The process as claimed in claim 7, wherein the weight of said tin intermediate layer is in the range of from 0.2 to 2.8 g per m 2 of each surface of said substrate.
Claim 15
Dependent Claim
42 words
The process as claimed in claim 7, wherein said surface layer comprises 5 to 150 mg of metallic chromium and 3 to 30 mg, in terms of metallic chromium, of hydrated chromium oxide per m 2 of each surface of said substrate.
References Cited (Backward Citations)
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