 Sustainable Farming.ca - Download the EBook Agriculture |  InformationalPrivacy |
Steel MakingImpact TestsImpact tests are of considerable importance as an indication ... High Speed Steel For centuries the secret art of making tool steel was handed ... Restoring Overheated Steel The effect of heat treatment on overheated steel is shown gra... Sulphur SULPHUR is another element (symbol S) which is always found i... Quenching The Work In some operations case-hardened work is quenched from the bo... Heating Of Manganese Steel Another form of heat-treating furnace is that which is used ... Manganese MANGANESE is a metal much like iron. Its chemical symbol is M... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... Carburizing Low-carbon Sleeves Low-carbon sleeves are carburized and pushed on malleable-ir... Steel Can Be Worked Cold As noted above, steel can be worked cold, as in the case of ... Properties Of Alloy Steels The following table shows the percentages of carbon, manganes... Annealing Alloy Steel The term alloy steel, from the steel maker's point of view, r... Heat Treatment Of Gear Blanks This section is based on a paper read before the American Gea... Pyrometers Armor plate makers sometimes use the copper ball or Siemens' ... Phosphorus Phosphorus is one of the impurities in steel, and it has been... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... Preventing Carburizing By Copper-plating Copper-plating has been found effective and must have a thick... Tungsten Tungsten, as an alloy in steel, has been known and used for a... Highly Stressed Parts The highly stressed parts on the Liberty engine consisted of ... Quenching Tool Steel To secure proper hardness, the cooling of quenching of steel ... |
Piston PinCategory: 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
Viewed 1045 |
||||||||||||||||||||
