VIEW THE MOBILE VERSION of www.steelmaking.ca Informational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

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

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

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

Quenching The Work
In some operations case-hardened work is quenched from the bo...



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



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 5409