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Steel MakingEbbw Vale And The Bessemer ProcessAfter his British Association address in August 1856, Besseme... Annealing There is no mystery or secret about the proper annealing of d... Annealing Alloy Steel The term alloy steel, from the steel maker's point of view, r... Restoring Overheated Steel The effect of heat treatment on overheated steel is shown gra... High Speed Steel For centuries the secret art of making tool steel was handed ... Annealing In Bone Steel and cast iron may both be annealed in granulated bone. ... Fatigue Tests It has been known for fifty years that a beam or rod would fa... Gears The material used for all gears on the Liberty engine was sel... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... Knowing What Takes Place How are we to know if we have given a piece of steel the ver... Corrosion This steel like any other steel when distorted by cold worki... The Theory Of Tempering Steel that has been hardened is generally harder and more br... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... The Effect Of Tempering On Water-quenched Gages The following information has been supplied by Automatic and ... Annealing Work With the exception of several of the higher types of alloy s... Annealing Method Forgings which are too hard to machine are put in pots with ... Preventing Decarbonization Of Tool Steel It is especially important to prevent decarbonization in such... Making Steel Balls Steel balls are made from rods or coils according to size, st... Suggestions For Handling High-speed Steels The following suggestions for handling high-speed steels are ... Non-shrinking Oil-hardening Steels Certain steels have a very low rate of expansion and contract... |
Carburizing By GasCategory: CASE-HARDENING OR SURFACE-CARBURIZING The process of carburizing by gas, briefly mentioned on page 88, consists of having a slowly revolving, properly heated, cylindrical retort into which illuminating gas (a mixture of various hydrocarbons) is continuously injected under pressure. The spent gases are vented to insure the greatest speed in carbonizing. The work is constantly and uniformly exposed to a clean carbonizing atmosphere instead of partially spent carbonaceous solids which may give off very complex compounds of phosphorus, sulphur, carbon and nitrogen. Originally this process was thought to require a gas generator but it has been discovered that city gas works all right. The gas consists of vapors derived from petroleum or bituminous coal. Sometimes the gas supply is diluted by air, to reduce the speed of carburization and increase the depth. Next: Preventing Carburizing By Copper-plating Previous: Case-hardening Treatments For Various Steels
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