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Steel Making

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

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

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

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

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

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

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

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



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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