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Steel Making

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

Critical Points
One of the most important means of investigating the properti...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

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

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...



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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