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Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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



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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