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Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Heating
Although it is possible to work steels cold, to an extent de...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Alloying Elements
Commercial steels of even the simplest types are therefore p...



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.





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Previous: Highly Stressed Parts



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