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Steel Making

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

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

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

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Hardness Testing
The word hardness is used to express various properties of me...



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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