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Steel MakingNon-shrinking Oil-hardening SteelsCertain steels have a very low rate of expansion and contract... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... Using Illuminating Gas The choice of a carburizing furnace depends greatly on the fa... Double Annealing Water annealing consists in heating the piece, allowing it to... Hardening Carbon Steel For Tools For years the toolmaker had full sway in regard to make of st... Sulphur Sulphur is another impurity and high sulphur is even a greate... Carburizing Material The simplest carburizing substance is charcoal. It is also th... Preventing Decarbonization Of Tool Steel It is especially important to prevent decarbonization in such... Testing And Inspection Of Heat Treatment The hard parts of the gear must be so hard that a new mill f... The Theory Of Tempering Steel that has been hardened is generally harder and more br... Heat Treatment Of Steel Heat treatment consists in heating and cooling metal at defin... Annealing Alloy Steel The term alloy steel, from the steel maker's point of view, r... The Thermo-couple With the application of the thermo-couple, the measurement of... Compensating Leads By the use of compensating leads, formed of the same materia... Conclusions Martien was probably never a serious contender for the honor ... The Quenching Tank The quenching tank is an important feature of apparatus in c... Tensile Properties Strength of a metal is usually expressed in the number of pou... Introduction Of Carbon The matter to which these notes are primarily directed is the... Instructions For Working High-speed Steel Owing to the wide variations in the composition of high-speed... |
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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