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Steel Making

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

SULPHUR is another element (symbol S) which is always found i...

SILICON is a very widespread element (symbol Si), being an es...

A combination of the characteristics of nickel and the charac...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

The material used for all gears on the Liberty engine was sel...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Tempering Round Dies


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

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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