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Steel Making

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

Quenching
It is considered good practice to quench alloy steels from th...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

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...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Annealing
There is no mystery or secret about the proper annealing of d...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

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

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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