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Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

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

There is no mystery or secret about the proper annealing of d...

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

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

Silicon prevents, to a large extent, defects such as gas bubb...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

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

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

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

Impact Tests
Impact tests are of considerable importance as an indication ...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Carburizing By Gas


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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