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Steel Making

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Conclusions
Martien was probably never a serious contender for the honor ...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...



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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