US4429021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium-plated steel strip having excellent weldability and resistance to corrosion
Assignee: Nippon Steel Corp
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Filing: 1981-12-08
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Granted: 1984-01-31
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Expires: 2001-12-08
Abstract
Abstract A chromium-plated steel strip having an excellent weldability and a satisfactory resistance to corrosion, comprises a steel strip substrate, a base layer consisting of an amorphous metallic material, for example, Ni-P or Ni-B alloy, in an amount of 3 to 500 mg/m2, an intermediate layer consisting of tin in an amount of 2.8 g/m2 or less, and a surface layer consisting of metallic chromium and hydrated chromium oxide in an amount of 5 to 150 mg/m2 and 3 to 30 mg/m2, respectively.
Inventors
- 👤 Mitsuo Higashi
- 👤 Jyun-ichi Morita
- 👤 Kenzi Koyama
- 👤 Mitsuo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:35
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: 6
Claim 1
Independent Claim
122 words
A chromium-plated steel strip having excellent weldability and resistance to corrosion, comprising: a steel strip substrate; an amorphous metal base layer consisting essentially of Ni-P or Ni-B formed on said substrate in an amount of 3 to 500 mg per m 2 of said substrate; with P or B in an amount of 1-21 mg/m 2 of said substrate; an electroplated tin intermediate layer formed on said base layer in an aqueous bath in an amount of 2.8 g or less per m 2 of said substrate, and; a surface layer coated on said intermediate layer, said surface layer containing 5 to 150 mg of metallic chromium and 3 to 30 mg of hydrated chromium oxide per m 2 of said substrate.
Claim 2
Dependent Claim
122 words
A chromium-plated steel strip having excellent weldability and resistance to corrosion, comprising: a steel strip substrate; an amorphous metal base layer consisting essentially of Ni-P or Ni-B formed on said substrate in an amount of 3 to 500 mg per m 2 of said substrate; with P or B in an amount of 1-21 mg/m 2 of said substrate; an electroplated tin intermediate layer formed on said base layer in an aqueous bath in an amount of 2.8 g or less per m 2 of said substrate, and; a surface layer coated on said intermediate layer, said surface layer containing 5 to 150 mg of metallic chromium and 3 to 30 mg of hydrated chromium oxide per m 2 of said substrate.
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
32 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 said substrate.
Claim 6
Dependent Claim
34 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 of said substrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |