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Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

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

Annealing Work
With the exception of several of the higher types of alloy s...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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



Piston Pin






Category: APPLICATION OF LIBERTY ENGINE MATERIALS TO THE AUTOMOTIVE INDUSTRY

The piston pin on an aviation engine must possess maximum resistance
to wear and to fatigue. For this reason, the piston pin is considered,
from a metallurgical standpoint, the most important part on the
engine to produce in quantities and still possess the above
characteristics. The material used for the Liberty engine piston
pin was S. A. E. No. 2315 steel, which is of the following chemical
composition: Carbon, 0.100 to 0.200 per cent; manganese, 0.500
to 0.800 per cent; phosphorus, 0.040 maximum per cent; sulphur,
0.045 maximum per cent; nickel, 3.250 to 3.750 per cent.

Each finished piston pin, after heat treatment, must show a minimum
scleroscope hardness of the case of 70, a scleroscope hardness of
the core of from 35 to 55 and a minimum crushing strength when
supported as a beam and the load applied at the center of 35,000
lb. The heat treatment used to obtain the above physical properties
consisted in carburizing at a temperature not to exceed 1,675 deg.F.,
for a sufficient length of time to secure a case of from 0.02 to
0.04 in. deep. The pins are then allowed to cool slowly from the
carbonizing heat, after which the hole is finish-machined and the
pin cut to length. The finish heat treatment of the piston pin
consisted in quenching in oil from a temperature of from 1,525 to
1,575 deg.F. to refine the grain of core properly and then quenching in
oil at a temperature of from 1,340 to 1,380 deg.F. to refine and harden
the grain of the case properly, as well as to secure proper hardness
of core. After this quenching, all piston pins are tempered in oil
at a temperature of from 375 to 400 deg.F. A 100 per cent inspection
for scleroscope hardness of the case and the core was made, and
no failures were ever recorded when the above material and heat
treatment was used.





Next: Application To The Automotive Industry

Previous: Crankshaft



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