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

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

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

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

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...



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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