120. The word dynamics (cf. dynamic--the opposite of static) as used in the nomenclature of music has to do with the various degrees of power (i.e., the comparative loudness and softness) of tones. As in the case of words referring to tempo... Read more of Dynamics at Sings.caInformational Site Network Informational
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Steel Making

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Hardness Testing
The word hardness is used to express various properties of me...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

Corrosion
This steel like any other steel when distorted by cold worki...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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



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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