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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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



The Packing Department






Category: HEAT TREATMENT OF STEEL

In Fig. 56 is shown the packing pots where
the work is packed. These are of malleable cast iron, with an internal
vertical flange around the hole A. This fits in a bell on the
end of the cast-iron pipe B, which is luted in position with
fireclay before the packing begins. At C is shown a pot ready
for packing. The crown gears average 10 to 12 in. in diameter and
weigh about 11 lb. each. When placed in the pots, they surround
the central tube, which allows the heat to circulate. Each pot
contains five gears. Two complete scrap gears are in each furnace
(i.e., gears which fail to pass machining inspection), and at
the top of front pot are two or more short segments of scrap gear,
used as test pieces to gage depth of case.



After filling to the top with compound, the lid D is luted on.
Ten pots are then placed in a furnace. It will be noted that the
pots to the right are numbered 1, 2, 3, 4, indicating the position
they are to occupy in the furnace.

The cast-iron ball shown at E is small enough to drop through
the pipe B, but will not pass through the hole A in the bottom
of the pot. It is used as a valve to plug the bottom of the pot
to prevent the carburizing compound from dropping through when
removing the carburized gears to the quenching bath.

Without detracting from the high quality of the work, the metallurgist
in this plant has succeeded in cutting out one entire operation
and reducing the time in the hardening room by about 24 hr.

Formerly, the work was carburized at about 1,700 deg.F. for 9 hr. The
pots were then run out into the yard and allowed to cool slowly.
When cool, the work was taken out of the pots, reheated and quenched
at 1,600 deg.F. to refine the core. It was again reheated to 1,425 deg.F.
and quenched to refine the case. Finally, it was drawn to the proper
temper.





Next: Short Method Of Treatment

Previous: Heat-treating Department



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