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Steel MakingFatigue TestsIt has been known for fifty years that a beam or rod would fa... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... Tungsten Tungsten, as an alloy in steel, has been known and used for a... Annealing Of High-speed Steel For annealing high-speed steel, some makers recommend using g... Chromium Chromium when alloyed with steel, has the characteristic func... The Pyrometer And Its Use In the heat treatment of steel, it has become absolutely nece... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... Correction By Zero Adjustment Many pyrometers are supplied with a zero adjuster, by means ... Hardening Steel is hardened by quenching from above the upper critical.... The Electric Process The fourth method of manufacturing steel is by the electric f... Carbon Steels For Different Tools All users of tool steels should carefully study the different... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... Quenching The Work In some operations case-hardened work is quenched from the bo... Non-shrinking Oil-hardening Steels Certain steels have a very low rate of expansion and contract... Conclusions Martien was probably never a serious contender for the honor ... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer For extremely high temperature, the optical pyrometer is lar... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Phosphorus Phosphorus is one of the impurities in steel, and it has been... |
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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