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Steel Making

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

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

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

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

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

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

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

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

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

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

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

Hardening
Steel is hardened by quenching from above the upper critical....

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...



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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