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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

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

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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



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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