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

Steel Making

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

Annealing Work
With the exception of several of the higher types of alloy s...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

The Modern Hardening Room
A hardening room of today means a very different place from ...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

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

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...



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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