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Steel Making

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Hardness Testing
The word hardness is used to express various properties of me...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...



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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