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Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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

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

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...



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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