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Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Annealing
There is no mystery or secret about the proper annealing of d...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Furnace Data
In order to give definite information concerning furnaces, fu...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Hardness Testing
The word hardness is used to express various properties of me...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

The Influence Of Size
The size of the piece influences the physical properties obta...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...



Tempering Round Dies






Category: HARDENING CARBON STEEL FOR TOOLS

A number of circular dies of carbon tool steel for use in tool
holders of turret lathes were required. No proper tempering oven
was available, so the following method was adopted and proved quite
successful.

After the dies had been hardened dead hard in water, they were
cleaned up bright. A pair of ordinary smiths' tongs was made with
jaws of heavy material and to fit nicely all around the outside of
the die, leaving a 3/32-in. space when the jaws were closed around
the die. The dies being all ready, the tongs were heated red hot, and
the dies were picked up and held by the tongs. This tempered them
from the outside in, left the teeth the temper required and the
outside slightly softer. The dies held up the work successfully
and were better than when tempered in the same bath.





Next: The Effect Of Tempering On Water-quenched Gages

Previous: Shrinking And Enlarging Work



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