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Steel Making

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

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

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



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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