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Steel Making

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

Tungsten, as an alloy in steel, has been known and used for a...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

This steel like any other steel when distorted by cold worki...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Although it is possible to work steels cold, to an extent de...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Separating The Work From The Compound


During the pulling of the heat, the pots are dumped upon a cast-iron
screen which forms a table or apron for the furnace. Directly beneath
this table is located one of the steel conveyor carts, shown in Fig.
43, which is provided with two wheels at the rear and a dolly clevis
at the front, which allows it to be hauled away from beneath the
furnace apron while filled with red-hot compound. A steel cover is
provided for each box, and the material is allowed to cool without
losing much of the evolved gases which are still being thrown off
by the compound.

As this compound comes from the carburizing pots it contains bits
of fireclay which represent a part of the luting used for sealing,
and there may be small parts of work or bits of fused material
in it as well. After cooling, the compound is very dusty and
disagreeable to handle, and, before it can be used again, must be
sifted, cleaned and blended.

Some time ago the writer was confronted with this proposition for
one of the largest consumers of carburizing compound in the world,
and the problem was handled in the following manner: The cooled
compound was dumped from the cooling cars and sprinkled with a
low-grade oil which served the dual purposes of settling the dust
and adding a certain percentage of valuable hydrocarbon to the
compound. In Fig. 44 is shown the machine that was designed to do
the cleaning and blending.

Next: Blending The Compound

Previous: The Care Of Carburizing Compounds

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