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2 011 686

(13)

C1

(51)

IPC

(21) (22)

Application

4939974/02, 1991-02-15

(22)

Actual filing date

1991-02-15

(45)

Published

1994-04-30

(72)

Inventor

Volegov A.N.Ermolin N.G.

(73)

Holder

Volegov Aleksandr NikolaevichErmolin Nikolaj Grigor'Evich

METHOD OF TREATING ALLOYED CONSTRUCTIONAL STEEL CASTINGS Russian patent published in 1994 - IPC

Abstract RU 2011686 C1

FIELD: metal-working. SUBSTANCE: alloyed constructional steel castings were heated in vacuum furnace during 1 to 3 h at vacuum of 10-4mm Hg mm Hg and then allowed to cool in three steps, first, in vacuum heat-treatment furnace chamber to Ac1-(80-100)°C (80 to 100) C at cooling rate of 400 to 430 C/h, then in furnace cooling chamber to point of 200 C and finally in the air. EFFECT: more effective treatment. 1 tbl

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RU 2 011 686 C1

Authors

Volegov A.N.

Ermolin N.G.

Dates

1994-04-30—Published

1991-02-15—Filed

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