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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Manganese adds considerably to the tensile strength of steel,...

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

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

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

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

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Armor plate makers sometimes use the copper ball or Siemens' ...

SULPHUR is another element (symbol S) which is always found i...

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

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

Carburizing By Gas


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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