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Steel Making

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

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

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Hardening
Steel is hardened by quenching from above the upper critical....

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

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

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...



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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