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Steel Making

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...



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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