Steel MakingGas Consumption For CarburizingAlthough the advantages offered by the gas-fired furnace for ... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Furnace Data In order to give definite information concerning furnaces, fu... Process Of Carburizing Carburizing imparts a shell of high-carbon content to a low-... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Double Annealing Water annealing consists in heating the piece, allowing it to... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... The Effect The heating at 1,600 deg.F. gives the first heat treatment w... Phosphorus Phosphorus is one of the impurities in steel, and it has been... Carburizing By Gas The process of carburizing by gas, briefly mentioned on page ... Hardening The forgings can be hardened by cooling in still air or quen... The Pyrometer And Its Use In the heat treatment of steel, it has become absolutely nece... Shrinking And Enlarging Work Steel can be shrunk or enlarged by proper heating and cooling... Typical Oil-fired Furnaces Several types of standard oil-fired furnaces are shown herew... Compensating Leads By the use of compensating leads, formed of the same materia... Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer For extremely high temperature, the optical pyrometer is lar... Care In Annealing Not only will benefits in machining be found by careful anne... Tungsten Tungsten, as an alloy in steel, has been known and used for a... For Milling Cutters And Formed Tools FORGING.--Forge as before.--ANNEALING.--Place the steel in a ... Carburizing Material The simplest carburizing substance is charcoal. It is also th... |
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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