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US 6,635,126 B2Granted
Advanced case carburizing secondary hardening steels
AssigneeNorthwestern University
InventorsCharles J. Kuehmann, Gregory B. Olson, John P. Wise, Carelyn Campbell
Life of this patent
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Abstract
Steel alloys susceptible to case and core hardening comprising 0.05 to 0.24 weight percent carbon; 15 to 28 weight percent cobalt and 1.5 to 9.5 weight percent in nickel, small percentages of one or more additives: chromium, molybdenum, and vanadium; and the balance iron.
Claims1
A steel alloy comprising, in combination:
- a) about 0.05 to about 0.24 weight percent carbon;
- b) about 15.0 to about 28.0 weight percent cobalt;
- c) about 1.5 to about 9.5 weight percent nickel;
- d) one or more additives selected from the group consisting of:
- 1) about 3.5 to about 9.0 weight percent chromium;
- 2) up to about 2.5 weight percent molybdenum;
- 3) up to 0.2 weight percent vanadium;
- e) and the balance, iron,
- said alloy having a case and a core, said case having a carbon content greater than said core, said alloy comprising a martensite phase and having a case hardness of at least about Rockwell 60 C.
6 more elements
Dependencies are inferred from the claim text.