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Steel Making

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

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

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

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Furnace Data
In order to give definite information concerning furnaces, fu...

Silicon
SILICON is a very widespread element (symbol Si), being an es...



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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