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

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Hardening
Steel is hardened by quenching from above the upper critical....

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

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

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

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

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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



Annealing Of High-speed Steel






Category: ANNEALING

For annealing high-speed steel, some makers recommend using ground
mica, charcoal, lime, fine dry ashes or lake sand as a packing
in the annealing boxes. Mixtures of one part charcoal, one part
lime and three parts of sand are also suggested, or two parts of
ashes may be substituted for the one part of lime.

To bring about the softest structure or machine ability of high-speed
steel, it should be packed in charcoal in boxes or pipes, carefully
sealed at all points, so that no gases will escape or air be admitted.
It should be heated slowly to not less than 1,450 deg.F. and the steel
must not be removed from its packing until it is cool. Slow heating
means that the high heat must have penetrated to the very core of
the steel.

When the steel is heated clear through it has been in the furnace
long enough. If the steel can remain in the furnace and cool down
with it, there will be no danger of air blasts or sudden or uneven
cooling. If not, remove the box and cover quickly with dry ashes,
sand or lime until it becomes cold.

Too high a heat or maintaining the heat for too long a period,
produces a harsh, coarse grain and greatly increases the liability
to crack in hardening. It also reduces the strength and toughness
of the steel.

Steel which is to be used for making tools with teeth, such as
taps, reamers and milling cutters, should not be annealed too much.
When the steel is too soft it is more apt to tear in cutting and
makes it more difficult to cut a smooth thread or other surface.
Moderate annealing is found best for tools of this kind.





Next: Tool Or Crucible Steel

Previous: Annealing



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