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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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

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

Vanadium has a very marked effect upon alloy steels rich in c...

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

Chromium when alloyed with steel, has the characteristic func...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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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