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

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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



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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