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Steel Making

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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



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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