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Steel Making

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

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

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

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

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

Hardness Testing
The word hardness is used to express various properties of me...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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



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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