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Steel Making

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

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

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...



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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