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Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

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

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

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

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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



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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