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Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Critical Points
One of the most important means of investigating the properti...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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



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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