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Air-hardening Steels
These steels are recommended for boring, turning and planing...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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



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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