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Steel Making

Impact Tests
Impact tests are of considerable importance as an indication ...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Annealing Work
With the exception of several of the higher types of alloy s...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Nickel
Nickel may be considered as the toughest among the non-rare a...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...



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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