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Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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



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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