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Steel Making

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

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Reheating for machine ability was done at 100 deg. less than ...

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

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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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