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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

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

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

Annealing Work
With the exception of several of the higher types of alloy s...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...



Heat-treating Department






Category: HEAT TREATMENT OF STEEL

The heat-treating department occupies an
L-shaped building. The design is very practical, with the furnace
and the floor on the same level so that there is no lifting of
heavy pots. Fuel oil is used in all the furnaces and gives highly
satisfactory results. The consumption of fuel oil is about 2 gal.
per hour per furnace.

The work is packed in the pots in a room at the entrance to the
heat-treatment building. Before packing, each gear is stamped with
a number which is a key to the records of the analysis and complete
heat treatment of that particular gear. Should a question at any time
arise regarding the treatment of a certain gear, all the necessary
information is available if the number on the gear is legible. For
instance, date of treatment, furnace, carburizing material, position
of the pot in the furnace, position of gear in pot, temperature of
furnace and duration of treatment are all tabulated and filed for
reference.

After marking, all holes and parts which are to remain uncarburized
are plugged or luted with a mixture of kaolin and Mellville gravel
clay, and the gear is packed in the carburizing material. Bohnite,
a commercial carburizing compound is used exclusively at this plant.
This does excellent work and is economical. Broadly speaking, the
economy of a carburizing compound depends on its lightness. The
space not occupied by work must be filled with compound; therefore)
other things being equal, a compound weighing 25 lb. would be worth
more than twice as much as one weighing 60 lb. per cubic foot. It
has been claimed that certain compounds can be used over and over
again, but this is only true in a limited way, if good work is
required. There is, of course, some carbon in the compound after
the first use, but for first-class work, new compound must be used
each time.





Next: The Packing Department

Previous: Annealing Method



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