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Steel Making

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

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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



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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