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Steel Making

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

The Electric Process
The fourth method of manufacturing steel is by the electric f...



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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