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Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Hardening
Steel is hardened by quenching from above the upper critical....

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

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.





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Previous: Highly Stressed Parts



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