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Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

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



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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