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Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

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



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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