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Steel Making

The Influence Of Size
The size of the piece influences the physical properties obta...

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

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

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

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Hardening
Steel is hardened by quenching from above the upper critical....

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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



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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