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Steel Making

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

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

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

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

Quenching
It is considered good practice to quench alloy steels from th...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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



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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