US4331478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant stainless steel powder and compacts made therefrom
Assignee: SCM Metal Products Inc
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Filing: 1980-06-20
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Granted: 1982-05-25
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Expires: 2000-06-20
Abstract
Abstract The corrosion resistance of atomized tin-and-carbon containing stainless steel powders and compacts thereof is enhanced by incorporating a modifier metal into the melt prior to atomization. Effective modifier metals disclosed are niobium, titanium, tantalum, molybdenum, and the like.
Inventors
- 👤 David H. Ro
- 👤 Erhard Klar
- 👤 Charles I. Whitman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:41
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; B22F2009/0824; B22F2009/0828; B22F2999/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A process for improving the corrosion resistance of an atomized carbon and tin containing stainless steel powder or sintered compact thereof, said powder or compact thereof containing at least about 0.05% carbon, which comprises; adding an effective proportion of a modifier metal selected from the group consisting of niobium, titanium, tantalum, and mixtures thereof to a metal of said stainless steel prior to atomizing, said modifier metal being effective for enhancing the corrosion resistance of said atomized powder or a sintered compact thereof.
Claim 2
Dependent Claim
83 words
A process for improving the corrosion resistance of an atomized carbon and tin containing stainless steel powder or sintered compact thereof, said powder or compact thereof containing at least about 0.05% carbon, which comprises; adding an effective proportion of a modifier metal selected from the group consisting of niobium, titanium, tantalum, and mixtures thereof to a metal of said stainless steel prior to atomizing, said modifier metal being effective for enhancing the corrosion resistance of said atomized powder or a sintered compact thereof.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said modifier metal is niobium.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said modifier metal is titanium.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said modifier metal is tantalum.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said modifier metal is present in an amount from about 0.01% to about 10% by weight of said powder.
Claim 7
Dependent Claim
59 words
A tin and carbon containing corrosion resistant atomized stainless steel powder characterized in that said atomized stainless steel powder contains; 0.01% to about 10% tin, at least about 0.05% carbon, 0.01% to about 10% of a modifier metal selected from the group consisting of niobium, titanium, tantalum, and mixtures thereof, and the balance an iron base stainless steel alloy.
Claim 8
Dependent Claim
59 words
A tin and carbon containing corrosion resistant atomized stainless steel powder characterized in that said atomized stainless steel powder contains; 0.01% to about 10% tin, at least about 0.05% carbon, 0.01% to about 10% of a modifier metal selected from the group consisting of niobium, titanium, tantalum, and mixtures thereof, and the balance an iron base stainless steel alloy.
Claim 9
Dependent Claim
36 words
The tin and carbon containing corrosion resistant atomized stainless steel powder of claim 6; wherein the level of tin is 0.01% to about 5.0% and the level of modifier metal is about 0.01% to about 5.0%.
Claim 10
Dependent Claim
9 words
A sintered compact of the powder of claim 6.
Claim 11
Dependent Claim
21 words
The sintered compact of claim 8 wherein the ratio of modifier metal to carbon is from about 1:1 to about 10:1.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |