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Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...



Carburizing By Gas






Category: CASE-HARDENING OR SURFACE-CARBURIZING

The process of carburizing by gas, briefly mentioned on page 88,
consists of having a slowly revolving, properly heated, cylindrical
retort into which illuminating gas (a mixture of various hydrocarbons)
is continuously injected under pressure. The spent gases are vented
to insure the greatest speed in carbonizing. The work is constantly
and uniformly exposed to a clean carbonizing atmosphere instead
of partially spent carbonaceous solids which may give off very
complex compounds of phosphorus, sulphur, carbon and nitrogen.

Originally this process was thought to require a gas generator but
it has been discovered that city gas works all right. The gas consists
of vapors derived from petroleum or bituminous coal. Sometimes the
gas supply is diluted by air, to reduce the speed of carburization
and increase the depth.





Next: Preventing Carburizing By Copper-plating

Previous: Case-hardening Treatments For Various Steels



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