Production of annular products from centrifugally cast steel str

Details Production of annular products from centrifugally cast steel str Production of annular products from centrifugally cast steel str

1976-04-15

1977-06-21

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12R, 148 124, B22D 1302, C21D 908

Patent

active

040309444

ABSTRACT:
A technique for forming annular products such as bearing rings from a starting, centrifugally cast hollow ingot is described. The ingot is hot-sawed into intermediate annuli as it cools down from the casting temperature to below eutectoid temperature. The annuli are then soft-annealed to obtain a spheroidized carbidic phase, and are then re-heated to an austenization temperature. The re-heated annuli are then hot-worked by shape rolling or forging into the desired final shape, after which they are immediately quenched and tempered. The hot-working operation can proceed either above or below eutectoid temperature.

REFERENCES:
patent: 3615879 (1971-10-01), Herzog
patent: 3929181 (1975-12-01), Beyer et al.
patent: 3954133 (1976-05-01), Miyaoka et al.

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