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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

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

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

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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



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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