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Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Quenching
It is considered good practice to quench alloy steels from th...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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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