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

Steel Making

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

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

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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



Judging The Heat Of Steel






Category: HEAT TREATMENT OF STEEL

While the use of a pyrometer is of course the only way to have
accurate knowledge as to the heat being used in either forging or
hardening steels, a color chart will be of considerable assistance
if carefully studied. These have been prepared by several of the
steel companies as a guide, but it must be remembered that the colors
and temperatures given are only approximate, and can be nothing
else.


The Magnet Test.--The critical point can also be determined by
an ordinary horse-shoe magnet. Touch the steel with a magnet during
the heating and when it reaches the temperature at which steel fails
to attract the magnet, or in other words, loses its magnetism,
the critical point has been reached.

The work is heated up slowly in the furnace and the magnet applied
from time to time. The steel being heated will attract the magnet
until the heat reaches the critical point. The magnet is applied
frequently and when the magnet is no longer attracted, the piece
is at the lowest temperature at which it can be hardened properly.
Quenching slightly above this point will give a tool of satisfactory
hardness. The method applies only to carbon steels and will not
work for modern high-speed steels.





Next: Heat Treatment Of Gear Blanks

Previous: Hardening



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