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Steel Making

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

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

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

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Heating
Although it is possible to work steels cold, to an extent de...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...



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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