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Steel Making

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

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

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

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

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

Critical Points
One of the most important means of investigating the properti...

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



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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