Precision Part Specialists


Tempering is reheating hardened material to a temperature below the eutectoid temperature to decrease hardness and increase toughness. Alloying dictates the number of tempers a material may require. PHT tempers all materials for one hour soak per inch of cross section or two hour soak minimum time, whichever is greater.

Examples of number of tempers:

  • 4140, O-1:  1 temper
  • A-2, D-2, H-13:  2 tempers
  • 420 SS, 440 SS:  2 tempers
  • M-4, CPM 10V:  3 tempers
  • M-42:  4 tempers

Any material can be specified to be tempered more than the usual number of tempers given application requirements.

We have the following process types and furnace sizes to serve you:

  • Bright Vacuum: 48” x 48” x 60”
  • Clean Atmosphere:  66” diameter x 138” deep up to 20,000 lb. maximum capacity
  • Air: 36” x 36” x 48”

Furnaces adhere to AMS 2750/AMS-H-6875 pyrometry.


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