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Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...



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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