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

The Influence Of Size
The size of the piece influences the physical properties obta...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Annealing
There is no mystery or secret about the proper annealing of d...

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

Quenching
It is considered good practice to quench alloy steels from th...

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...



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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