Method for manufacturing hardened machined parts

Details Method for manufacturing hardened machined parts Method for manufacturing hardened machined parts

1977-03-25

1978-10-10

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

148 155, 148 165, 148 166, 148 315, 148 39, C23F 700

Patent

active

041194438

ABSTRACT:
Hardened machined parts are manufactured from rolled or forged steel which consists essentially of 0.05 to 0.15 wt % of C, up to 0.50 wt % of Si, up to 1.5 wt % of Mn, 0.30 to 1.0 wt % of Cr, 0.50 to 1.0 wt % of Mo, one or more of elements selected from the group consisting of 0.10 to 0.40 wt % of V, 0.03 to 0.20 wt % of Ti, 0.03 to 0.20 wt % of Nb and 0.0005 to 0.0050 wt % of B, the balance being Fe, in the following steps: cooling the steel in air from 900.degree. C to 1,000.degree. C; machining the cooled steel; and subjecting the machined steel to a nitriding treatment at 500.degree. to 650.degree. C for 2 to 8 hours.

REFERENCES:
patent: 1723015 (1929-08-01), DeFries
patent: 2083208 (1937-06-01), Tofaute
patent: 2188137 (1940-01-01), Malcolm
patent: 2946708 (1960-07-01), Berghaus et al.
patent: 3901740 (1975-08-01), Anderson
Molybdenum, Steels Irons Alloys, Archer 1948, Climax Molybdenum Co., N.Y. pp. 93-96.
Metals Handbook, 8th Ed., vol. 2, 1964, pp. 119-125.

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