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Steel Making

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

The Influence Of Size
The size of the piece influences the physical properties obta...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Critical Points
One of the most important means of investigating the properti...

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...



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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