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Steel Making

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

Critical Points
One of the most important means of investigating the properti...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

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

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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



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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