Hardening a hollow

Details Hardening a hollow Hardening a hollow

C - Chemistry, Metallurgy

21

D

148/54

C21D 9/08 (2006.01) C21D 1/63 (2006.01)

Patent

CA 1310891

20337 360 ABSTRACT OF THE DISCLOSURE A method for hardening cylindrical hollows made of steel, includes heating, followed by cooling utilizing a water bath while the hollow rotates about its longitudinal axis, and is partially immersed in the bath, with its axis parallel to the surface of the cooling bath. This method is improved by providing a particular speed rotation for the hollow as long as the temperature of the hollow is above the martensitic starting temperature; and drastically increasing the speed of rotation such that a significantly higher speed obtains as the martensitic transition temperature is reached.

570439

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