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Steel Making

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Hardening
The forgings can be hardened by cooling in still air or quen...

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

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

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...



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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