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Steel MakingBrown Automatic Signaling PyrometerIn large heat-treating plants it has been customary to mainta... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... Hardening Steel is hardened by quenching from above the upper critical.... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... The Thermo-couple With the application of the thermo-couple, the measurement of... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... Cyanide Bath For Tool Steels All high-carbon tool steels are heated in a cyanide bath. Wi... Critical Points One of the most important means of investigating the properti... Crankshaft The crankshaft was the most highly stressed part of the entir... Uses Of The Various Tempers Of Carbon Tool Steel DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres... Correction By Zero Adjustment Many pyrometers are supplied with a zero adjuster, by means ... Temperature For Annealing Theoretically, annealing should be accomplished at a tempera... Carbon In Tool Steel Carbon tool steel, or tool steel as it is commonly called, us... Open Hearth Process The open hearth furnace consists of a big brick room with a l... Care In Annealing Not only will benefits in machining be found by careful anne... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Hardening High-speed Steels We will now take up the matter of hardening high-speed steels... |
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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