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Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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

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

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...



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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