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HARDENING/TEMPERING DATA

For Oil Hardening (Dimensionally Stable) Precision Ground Flat Stock and Die Stock:

HARDENING: OIL HARDENING

It is recommended that stock be heated uniformly to 1450 - 1500 F degrees and quenched in oil. Temperature of the quenching oil should be 120o to 140o F for best results. Do not quench in water as this is an oil hardening steel.

Size                    Temperature            Quench            Rockwell C
All Sizes                1450-1500oF                Oil                        64-66 

TEMPERING:

For maximum toughness, a tempering time of one hour at temperature is recommended. 
The following table may be used a a guide depending on type of work.

Cutting Tools                            300o - 350o F (Light Straw)
Solid Punches & Dies               400o- 450o F (Straw)
Spring Temper                           750o - 800o F (Blue)
Annealing                                  1450o (Furnace cool 40
o per hour to 900o F)

For Air Hardening (Dimensionally Stable) Precision Ground Flat Stock and Die Stock:

HARDENING AIR HARDENING

Air Hardening Precision Ground Die Stock has a wide hardening range of 1700o to 1800oF with 1750oF recommended for most work. For the heavier sections use the high side of the range. Heat uniformly throughout but do not soak longer than necessary. Cool in still air. No pre-heat is required if pack or atmosphere controlled furnace methods are used, but with open furnace method a pre-heat of 1450oF is recommended.

Sizes                Temperature            Cool                Rockwell C
All sizes             1700o - 1800oF        Still Air                63.5 - 65

TEMPERING

A tempering time of two hours at temperature is recommended. For maximum toughness, double temper for two hours at each temperature recommended. The following table may be used as a guide, depending on type of work:

Light Blanking Punches & Dies                400o - 425oF
Heavy Blanking Punches & Dies             700oF
Annealing                                                     1525o - 1575oF
(Furnace cool at not more than 50o per hour to 800oF for maximum softness)

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Copyright 2001 METALWORKING BOOKS
Last modified: January 16, 2002