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Steel Making

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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

Annealing
There is no mystery or secret about the proper annealing of d...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...



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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