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Steel Making

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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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