| A ghost in a haunted house is seldom observed with anything like scientific precision. The spectre in the following narrative could not be photographed, attempts being usually made in a light which required prolonged exposure. Efforts to touc... Read more of The Lady In Black at Scary Stories.ca |  Informational.caPrivacy |
Steel MakingTesting And Inspection Of Heat TreatmentThe hard parts of the gear must be so hard that a new mill f... Oil-hardening Steel Heat slowly and uniformly to 1,450 deg.F. and forge thorough... Heat Treatment Of Steel Heat treatment consists in heating and cooling metal at defin... Heating Although it is possible to work steels cold, to an extent de... Critical Points One of the most important means of investigating the properti... Take Time For Hardening Uneven heating and poor quenching has caused loss of many ve... Quenching Tool Steel To secure proper hardness, the cooling of quenching of steel ... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... The Thermo-couple With the application of the thermo-couple, the measurement of... Preventing Carburizing By Copper-plating Copper-plating has been found effective and must have a thick... Preparing Parts For Local Case-hardening At the works of the Dayton Engineering Laboratories Company, ... Refining The Grain This is remedied by reheating the piece to a temperature slig... The Electric Process The fourth method of manufacturing steel is by the electric f... Carbon Steels For Different Tools All users of tool steels should carefully study the different... Short Method Of Treatment In the new method, the packed pots are run into the case-har... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... Classifications Of Steel Among makers and sellers, carbon tool-steels are classed by g... Carburizing By Gas The process of carburizing by gas, briefly mentioned on page ... Molybdenum Molybdenum steels have been made commercially for twenty-five... Silicon Silicon prevents, to a large extent, defects such as gas bubb... |
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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