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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

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

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Hardening
The forgings can be hardened by cooling in still air or quen...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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



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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