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Steel Making

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...



Separating The Work From The Compound






Category: CASE-HARDENING OR SURFACE-CARBURIZING

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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