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Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

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

Annealing Work
With the exception of several of the higher types of alloy s...

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...

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

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

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

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

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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

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

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.





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Previous: Annealing



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