H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/14
H05B 6/10 (2006.01) C21D 1/18 (2006.01) C21D 1/42 (2006.01) C21D 9/00 (2006.01) C21D 1/673 (2006.01)
Patent
CA 1171914
METHOD AND APPARATUS FOR HEAT TREATING STRUCTURAL MEMBERS Abstract of the Disclosure The present invention relates generally to an improved method and apparatus for induction heat treating and re- straint quenching structural members of carbon steel, to a uniform martensitic structure, such that distortion of the member due to rapid quenching is controlled to a minimum. More specifically, the member is generally heated by induc- tion in two stages generally to austenitizing temperature in the range of 1450° to 1750°F. Then the member is liquid quenched under restraint to below 1000°F. to minimize dis- tortion and finally tempered under restraint at a tempera- ture in the range of 750° to 1250°F. Such structural mem- bers attain minimum physical properties after heat treat- ing in the range of 110,000 psi yield strength and 125,000 psi tensile strength.
386795
Deemer Carroll L.
Satava George L.
Macrae & Co.
Midland Steel Products Co.
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