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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

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



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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