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Steel MakingConnecting RodsThe material used for all connecting rods on the Liberty engi... Composition And Properties Of Steel It is a remarkable fact that one can look through a dozen tex... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... Robert Mushet Robert (Forester) Mushet (1811-1891), born in the Forest of D... Composition Of Transmission-gear Steel If the nickel content of this steel is eliminated, and the pe... Annealing Method Forgings which are too hard to machine are put in pots with ... Hardening High-speed Steels We will now take up the matter of hardening high-speed steels... Heat Treatment Of Lathe Planer And Similar Tools FIRE.--For these tools a good fire is one made of hard foundr... Preventing Carburizing By Copper-plating Copper-plating has been found effective and must have a thick... Tensile Properties Strength of a metal is usually expressed in the number of pou... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... Hardening Carbon Steel For Tools For years the toolmaker had full sway in regard to make of st... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... Carburizing Low-carbon Sleeves Low-carbon sleeves are carburized and pushed on malleable-ir... Annealing Work With the exception of several of the higher types of alloy s... Temperature Recording And Regulation Each furnace is equipped with pyrometers, but the reading an... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... Highly Stressed Parts The highly stressed parts on the Liberty engine consisted of ... |
Non-shrinking Oil-hardening SteelsCategory: ALLOYS AND THEIR EFFECT UPON STEEL Certain steels have a very low rate of expansion and contraction in hardening and are very desirable for test plugs, gages, punches and dies, for milling cutters, taps, reamers, hard steel bushings and similar work. It is recommended that for forging these steels it be heated slowly and uniformly to a bright red, but not in a direct flame or blast. Harden at a dull red heat, about 1,300 deg.F. A clean coal or coke fire, or a good muffle-gas furnace will give best results. Fish oil is good for quenching although in some cases warm water will give excellent results. The steel should be kept moving in the bath until perfectly cold. Heated and cooled in this way the steel is very tough, takes a good cutting edge and has very little expansion or contraction which makes it desirable for long taps where the accuracy of lead is important. The composition of these steels is as follows: Per cent Manganese 1.40 to 1.60 Carbon 0.80 to 0.90 Vanadium 0.20 to 0.25 Next: Effect Of A Small Amount Of Copper In Medium-carbon Steel Previous: Properties Of Alloy Steels
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