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Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Heating
Although it is possible to work steels cold, to an extent de...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...



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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