Hardening a cylindrical hollow object preferably made of steel

Details Hardening a cylindrical hollow object preferably made of steel Hardening a cylindrical hollow object preferably made of steel

1988-06-22

1990-02-13

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148146, C21D 908

Patent

active

049003763

ABSTRACT:
A method for hardening cylindrical hollows made of steel, includes heating followed by cooling, under utilization of a water bath while the hollow rotates about its longitudinal axis, and is partially immersed in the bath, the axis being parallel to the surface of the cooling bath; this method is improved by providing a particular 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.

REFERENCES:
patent: 3231434 (1966-01-01), Seulen et al.
patent: 3944446 (1976-03-01), Bober
patent: 4421575 (1983-12-01), Murata et al.

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