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Gears
The material used for all gears on the Liberty engine was sel...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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...

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

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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



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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