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Steel Making

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Annealing Work
With the exception of several of the higher types of alloy s...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Nickel may be considered as the toughest among the non-rare a...

Tungsten, as an alloy in steel, has been known and used for a...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Molybdenum steels have been made commercially for twenty-five...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

Critical Points
One of the most important means of investigating the properti...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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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