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A Chromium-cobalt Steel
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Liberty Motor Connecting Rods
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Tool Or Crucible Steel
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Non-shrinking Oil-hardening Steels
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Pyrometers
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Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

Chrome-nickel Steel
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Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Corrosion
This steel like any other steel when distorted by cold worki...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Air-hardening Steels
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Hardening
The forgings can be hardened by cooling in still air or quen...

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

Conclusions
Martien was probably never a serious contender for the honor ...



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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