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Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...



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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