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Steel Making

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

The Influence Of Size
The size of the piece influences the physical properties obta...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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



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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