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Steel Making

Care In Annealing
Not only will benefits in machining be found by careful anne...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

Hardening
The forgings can be hardened by cooling in still air or quen...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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



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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