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Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Annealing
There is no mystery or secret about the proper annealing of d...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

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



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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