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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Machineability
Reheating for machine ability was done at 100 deg. less than ...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

Hardening
The forgings can be hardened by cooling in still air or quen...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Hardness Testing
The word hardness is used to express various properties of me...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...



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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