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Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Hardness Testing
The word hardness is used to express various properties of me...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

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

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

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

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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



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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