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Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Annealing
There is no mystery or secret about the proper annealing of d...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

Quenching
It is considered good practice to quench alloy steels from th...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...



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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