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Steel Making

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

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

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Heating
Although it is possible to work steels cold, to an extent de...



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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