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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Heating
Although it is possible to work steels cold, to an extent de...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

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

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...



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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