Steel MakingHeat Treatment Of SteelHeat treatment consists in heating and cooling metal at defin... Detrimental Elements Sulphur and phosphorus are two elements known to be detrimen... Short Method Of Treatment In the new method, the packed pots are run into the case-har... Heat Treatment Of Milling Cutters Drills Reamers Etc THE FIRE.--Gas and electric furnaces designed for high heats ... Steel Can Be Worked Cold As noted above, steel can be worked cold, as in the case of ... Forging High-speed Steel Heat very slowly and carefully to from 1,800 to 2,000 deg.F.... Standard Analysis The selection of a standard analysis by the manufacturer is t... Manganese MANGANESE is a metal much like iron. Its chemical symbol is M... Pyrometers For Molten Metal Pyrometers for molten metal are connected to portable thermoc... Tungsten Tungsten, as an alloy in steel, has been known and used for a... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... Care In Annealing Not only will benefits in machining be found by careful anne... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... High Speed Steel For centuries the secret art of making tool steel was handed ... Temperature Recording And Regulation Each furnace is equipped with pyrometers, but the reading an... Temperature For Annealing Theoretically, annealing should be accomplished at a tempera... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... Heating Although it is possible to work steels cold, to an extent de... Rate Of Cooling At the option of the manufacturer, the above treatment of gea... Liberty Motor Connecting Rods The requirements for materials for the Liberty motor connecti... |
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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