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US3663215A Expired / Lapsed US ⏱️ 0.0 years remaining

Wear-resistant stainless steel

Assignee: Armco Inc
•
Filing: 1969-08-13
•
Granted: 1972-05-16
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Expires: 1989-08-13
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Abstract

Abstract Austenitic stainless steel characterized by workability, weldability and resistance to wear. The steel contains the three essential ingredients chromium, nickel and silicon, with one or more of molybdenum, tungsten, vanadium, columbium/tantalum and titanium, and remainder iron. The chromium amounts to about 10 percent to 22 percent, nickel about 14 percent to 25 percent, silicon about 5 percent to 12 percent especially about 7 percent to 11 percent, together with about 3 percent to 12 percent of the group consisting of molybdenum up to 10 percent, tungsten up to 8 percent, vanadium up to 5 percent, columbium/tantalum up to 5 percent and titanium up to 5 percent. The carbon content should not exceed about 0.15 percent. Copper may be present in amounts up to 5 percent. The steel is particularly suited to applications in the food-processing, the petro-chemical and the nuclear industries, where sliding or relatively moving parts are encountered. It also is suited to the production of cutting tools and surgical instruments.

Inventors

  • 👤 Harry Tanczyn

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 21:26
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/34

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 54 words
Austenitic stainless steel precipitation-hardenable to great hardness and wear-resistance essentially consisting of about 10 percent to about 18 percent chromium, about 17 percent to about 19 percent nickel, about 7 percent to about 9 percent silicon, about 3 percent to about 7 percent molybdenum, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 2
Dependent Claim 54 words
Austenitic stainless steel precipitation-hardenable to great hardness and wear-resistance essentially consisting of about 10 percent to about 20 percent chromium, about 14 percent to about 20 percent nickel, about 5 percent to about 12 percent silicon, about 7 percent to about 10 percent molybdenum, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 3
Dependent Claim 61 words
Austenitic stainless steel precipitation hardenable to great hardness and wear-resistance essentially consisting of about 10 percent to about 22 percent chromium, about 14 percent to about 25 percent nickel, about 5 percent to abouT 11 percent silicon, about 3.5 percent to about 8 percent tungsten, up to about 7 percent molybdenum, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 4
Dependent Claim 54 words
Austenitic stainless steel essentially consisting of about 10 percent to about 22 percent chromium, about 14 percent to about 25 percent nickel, about 5 percent to about 12 percent silicon, about 1 percent to about 5 percent vanadium, up to about 10 percent molybdenum, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 5
Dependent Claim 60 words
Austenitic stainless steel precipitation-hardenable to great hardness and wear-resistance essentially consisting of about 10 percent to about 20 percent chromium, about 15 percent to about 20 percent nickel, about 5 percent to about 11 percent silicon, up to about 9 percent molybdenum, about 1.5 percent to about 4 percent columbium, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 6
Dependent Claim 54 words
Austenitic stainless steel essentially consisting of about 10 percent to about 22 percent chromium, about 14 percent to about 25 percent nickel, about 5 percent to about 12 percent silicon, about 1 percent to about 5 percent titanium, up to about 10 percent molybdenum, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 7
Dependent Claim 60 words
Austenitic stainless steel precipitation-hardenable to great hardness and wear-resistance essentially consisting of about 10 percent to about 18 percent chromium, about 17 percent to about 22 percent nickel, about 9 percent to about 11 percent silicon, about 2 percent to about 4 percent molybdenum, up to about 5 percent tungsten, carbon not exceeding 0.15 percent and remainder substantially all iron.
Claim 8
Dependent Claim 60 words
Austenitic stainless steel precipitation-hardenable to great hardness and wear-resistance essentially consisting of about 10 percent to about 18 percent chromium, about 19 percent to about 22 percent nickel, about 9 percent to about 11 percent silicon, up to about 5 percent molybdenum, about 2 percent to about 4 percent tungsten, carbon not exceeding 0.15 percent and remainder substantially all iron.

References Cited (Backward Citations)

US1790177A Cited
US2984563A Cited
US3044871A Cited
US3198631A Cited
US3235417A Cited
US3476555A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-16 1975-11-15 1976-05-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-16 1979-11-15 1980-05-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-16 1983-11-15 1984-05-16 $7700.00 Window Closed / Lapsed

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