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Steel Making

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

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

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

Gears
The material used for all gears on the Liberty engine was sel...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

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

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



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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