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Steel Making

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

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

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...



Gears






Category: APPLICATION OF LIBERTY ENGINE MATERIALS TO THE AUTOMOTIVE INDUSTRY

The material used for all gears on the Liberty engine was selected
at the option of the manufacturer from the following standard S.
A. E. steels, the composition of which are given in Table 12,

TABLE 12.--COMPOSITION OF STEELS NOS. X-3,340 AND 6,140

Steel No X-3,340 6,140
Carbon, minimum 0.350 0.350
Carbon, maximum 0.450 0.450
Manganese, minimum 0.450 0.500
Manganese, maximum 0.750 0.800
Phosphorus, maximum 0.040 0.040
Sulphur, maximum 0.045 0.045
Nickel, minimum 2.750
Nickel, maximum 3.250
Chromium, minimum 0.700 0.800
Chromium, maximum 0.950 1.100
Vanadium, minimum 0.150

All gears were heat-treated to a scleroscope hardness of from 55
to 55. The heat treatment used to secure this hardness consisted
in quenching the forgings from a temperature of 1,550 to 1,600 deg.F.
in oil and annealing for good machineability at a temperature of
from 1,300 to 1,350 deg.F. Forgings treated in this manner showed a
Brinell hardness of from 177 to 217.





Next: Rate Of Cooling

Previous: Highly Stressed Parts



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