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Steel Making

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

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

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

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

Gears
The material used for all gears on the Liberty engine was sel...

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

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

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

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



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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