Induction hardening of steel

Details Induction hardening of steel Induction hardening of steel

1983-11-22

1986-07-08

Albritton, Clarence L.

Electric heating

Metal heating

Of cylinders

219 1041, 219 1075, 219 1077, 148143, 148144, 148152, H05B 664

Patent

active

045995028

ABSTRACT:
A method for induction hardening through hardened chromium-molybdenum hot work die steel comprising the steps of induction heating to a uniform temperature above the upper critical temperature, cooling, and double tempering at temperatures below the lower critical temperature to produce a workpiece having a tough core and a hard wear resistant surface. An apparatus is provided for induction hardening long workpieces with minimum distortion by providing an inductor coil which always remains centered around the workpiece during induction coil traverse. Mandrel bars for tube piercing mills can be induction hardened using this process and apparatus.

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patent: 4394194 (1983-07-01), Satava et al.
patent: 4459451 (1984-07-01), Regele
Roberts and Cary, Tool Steels, American Society for Metals, Metals Park, Ohio 44073, pp. 578-589 (4th edition, 1980).

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