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Steel Making

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...



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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