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US4224060A Expired / Lapsed US ⏱️ 0.0 years remaining

Hard alloys

Assignee: Acos Villares SA
•
Filing: 1977-12-29
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Granted: 1980-09-23
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Expires: 1997-12-29
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Abstract

Abstract This invention relates to hard alloys with a chemical composition by weight of 0.7 to 1.5% carbon; 0.1 to 1.0% silicon; 0.15 to 0.50% manganese; 0.03% maximum phosphorus; 0.20% maximum sulphur; 3.5 to 6.0% chromium; 0 to 10% molybdenum; 0 to 10% tungsten; 0 to 4.0% vanadium; 0.1 to 7.0% niobium; 0.2 to 12% cobalt; 0.08% maximum nitrogen; 0.25% maximum aluminum, the balance being iron, and which alloys contain in their raw melt structure and after hot deformation, individual (segregated) single niobium carbides or individual (segregated) double niobium and vanadium carbides, with a morphology controllable by the fabrication technique. After a suitable heat treatment, such alloys have an improved machinability performance over the conventional alloys (containing no niobium).

Inventors

  • 👤 Marcos H. C. de Souza
  • 👤 Celso A. Barbosa
  • 👤 Ivan G. S. Falleiros
  • 👤 Fabio Y. Mori
  • 👤 Werner Viertler

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 10:54
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/26; C22C38/30

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 101 words
A hard steel alloy having in the as cast and wrought structure idiomorphic, isolated niobium carbides in the case of alloys containing no vanadium and idiomorphic, isolated carbides of vanadium and niobium in the case of alloys containing vanadium consisting of, by weight, 0.7 to 1.50% carbon, 0.1 to 1.0% silicon, 0.15 to 0.50% manganese, up to 0.03% phosphorous, up to 0.20% sulfur, 3.50 to 6.0% chromium, 0 to 10.0% molybdenum, 0.0 to 10.0% tungsten, 0.0 to 4.0% vanadium, 0.2 to 12.0% cobalt, up to 0.08% nitrogen, up to 0.25% aluminum, 0.1 to 7.0% niobium, the balance iron and incidental impurities.
Claim 2
Dependent Claim 101 words
A hard steel alloy having in the as cast and wrought structure idiomorphic, isolated niobium carbides in the case of alloys containing no vanadium and idiomorphic, isolated carbides of vanadium and niobium in the case of alloys containing vanadium consisting of, by weight, 0.7 to 1.50% carbon, 0.1 to 1.0% silicon, 0.15 to 0.50% manganese, up to 0.03% phosphorous, up to 0.20% sulfur, 3.50 to 6.0% chromium, 0 to 10.0% molybdenum, 0.0 to 10.0% tungsten, 0.0 to 4.0% vanadium, 0.2 to 12.0% cobalt, up to 0.08% nitrogen, up to 0.25% aluminum, 0.1 to 7.0% niobium, the balance iron and incidental impurities.

References Cited (Backward Citations)

NL91218C Cited
CA513100A Cited
GB637222A Cited
DK140791B Cited
US3901690A Cited
DE2259420A1 Cited
US3907553A Cited
US3833360A Cited
SU393355A1 Cited
US4116684A Cited
US4036640A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-09-23 1984-03-24 1984-09-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-09-23 1988-03-24 1988-09-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-09-23 1992-03-24 1992-09-23 $7700.00 Window Closed / Lapsed

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