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Steel Making

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

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

Critical Points
One of the most important means of investigating the properti...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

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

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

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...



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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