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Crucible Steel
Crucible steel is still made by melting material in a clay or...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

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

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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

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



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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