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

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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



Process Of Carburizing






Category: HEAT TREATMENT OF STEEL

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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