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Steel Making

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...



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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