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Steel Making

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

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

Molybdenum steels have been made commercially for twenty-five...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Silicon prevents, to a large extent, defects such as gas bubb...

Process Of Carburizing


Carburizing imparts a shell of high-carbon
content to a low-carbon steel. This produces what might be termed
a dual steel, allowing for an outer shell which when hardened
would withstand wear, and a soft ductile core to produce ductility
and withstand shock. The operation is carried out by packing the
work to be carburized in boxes with a material rich in carbon and
maintaining the box so charged at a temperature in excess of the
highest critical point for a length of time to produce the desired
depth of carburized zone. Generally maintaining the temperature
at 1,650 to 1,700 deg. F. for 7 hr. will produce a carburized zone
1/32 in. deep.

Heating to a temperature slightly above the highest critical point
and cooling suddenly in some quenching medium, such as water or oil
hardens the steel. This treatment produces a maximum refinement
with the maximum strength.

Drawing to a temperature below the highest critical point (the
temperature being governed by the results required) relieves the
hardening strains set up by quenching, as well as the reducing
of the hardness and brittleness of hardened steel.

Next: Effects Of Proper Annealing

Previous: Annealing Work

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