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Corrosion
This steel like any other steel when distorted by cold worki...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

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



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.





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Previous: Annealing



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