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Steel Making

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Chromium
Chromium when alloyed with steel, has the characteristic func...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

Quenching
It is considered good practice to quench alloy steels from th...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...



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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