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Steel Making

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

The Influence Of Size
The size of the piece influences the physical properties obta...

Heating
Although it is possible to work steels cold, to an extent de...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

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

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...



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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