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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

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

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

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

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

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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

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



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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