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Steel MakingTempering Round DiesA number of circular dies of carbon tool steel for use in too... Impact Tests Impact tests are of considerable importance as an indication ... Pyrometry And Pyrometers A knowledge of the fundamental principles of pyrometry, or th... Restoring Overheated Steel The effect of heat treatment on overheated steel is shown gra... Hardening High-speed Steel In forging use coke for fuel in the forge. Heat steel slowly ... Making Steel Balls Steel balls are made from rods or coils according to size, st... Compensating Leads By the use of compensating leads, formed of the same materia... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... Double Annealing Water annealing consists in heating the piece, allowing it to... Flange Shields For Furnaces Such portable flame shields as the one illustrated in Fig. 1... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Carbon Tool Steel Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham... Brown Automatic Signaling Pyrometer In large heat-treating plants it has been customary to mainta... Composition And Properties Of Steel It is a remarkable fact that one can look through a dozen tex... Corrosion This steel like any other steel when distorted by cold worki... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... Pyrometers For Molten Metal Pyrometers for molten metal are connected to portable thermoc... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... Annealing Of Rifle Components At Springfield Armory In general, all forgings of the components of the arms manufa... Piston Pin The piston pin on an aviation engine must possess maximum res... |
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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