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

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

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

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

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

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

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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



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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