Hard alloys

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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75126C, 75126E, 75126F, 75126H, 75126J, C22C 3902

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042240603

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).

REFERENCES:
patent: 3833360 (1974-09-01), Giflo et al.
patent: 3901690 (1975-08-01), Philip et al.
patent: 3907553 (1975-09-01), Nagumo et al.
patent: 4036640 (1977-07-01), Philip et al.
patent: 4116684 (1978-09-01), Uchida et al.
Roberts et al.; "Tool Steels", ASM, 1962, pp. 707-713.

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