Process for the thermal treatment of metal workpieces in a...

Details Process for the thermal treatment of metal workpieces in a... Process for the thermal treatment of metal workpieces in a...

C - Chemistry, Metallurgy

21

D

148/37.2

C21D 1/773 (2006.01) C21D 1/613 (2006.01) C21D 1/767 (2006.01) F27B 5/16 (2006.01)

Patent

CA 1308631

ABSTRACT During the thermal treatment of metallic work pieces in a vacuum oven using gas quenching, one achieves quenching intensities comparable to those achieved in an oil bath if one uses helium, hydrogen, mixtures of these, or mixtures of helium and/or hydrogen with up to 30%-volume inert gas are used as a cooling gas, and the pressure "p" in the oven is adjusted to a value between 1 and 4 MPa and adjusts a value between 10 and 250 m Mpa sec-1 for the gas circulation velocity "v", relative to the product of p ? v.

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