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Steel Making

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...



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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