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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...



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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