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Steel Making

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

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

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...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...



Temperature For Annealing






Category: HEAT TREATMENT OF STEEL

Theoretically, annealing should be
accomplished at a temperature at just slightly above the critical
point. However, in practice the temperature is raised to a higher
point in order to allow for the solution of the carbon and iron to
be produced more rapidly, as the time required to produce complete
solution is reduced as the temperature increases past the critical
point.

For annealing the simpler types of low-carbon steels the following
temperatures have been found to produce uniform machining conditions
on account of producing uniform fine-grain pearlite structure:

0.15 to 0.25 per cent carbon, straight carbon steel.--Heat to 1,650 deg.F.
Hold at this temperature until the work is uniformly heated; pull
from the furnace and cool in air.

0.15 to 0.25 per cent carbon, 1-1/2 per cent nickel, 1/2 per cent
chromium steel.--Heat to 1,600 deg.F. Hold at this temperature until
the work is uniformly heated; pull from the furnace and cool in air.

0.15 to 0.25 per cent carbon, 3-1/2 per cent nickel steel.--Heat
to 1,575 deg.F. Hold at this temperature until the work is uniformly
heated; pull from the furnace and cool in air.





Next: Care In Annealing

Previous: Effects Of Proper Annealing



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