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Steel MakingComposition Of Transmission-gear SteelIf the nickel content of this steel is eliminated, and the pe... Hardening Steel is hardened by quenching from above the upper critical.... Plant For Forging Rifle Barrels The forging of rifle barrels in large quantities and heat-tre... 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... A Chromium-cobalt Steel The Latrobe Steel Company make a high-speed steel without tun... Machineability Reheating for machine ability was done at 100 deg. less than ... Effect Of Different Carburizing Material [Illustrations: FIGS. 33 to 37.] Each of these different p... Quality And Structure The quality of high-speed steel is dependent to a very great ... Pyrometers For Molten Metal Pyrometers for molten metal are connected to portable thermoc... Temperature For Annealing Theoretically, annealing should be accomplished at a tempera... Uses Of The Various Tempers Of Carbon Tool Steel DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres... Crankshaft The crankshaft was the most highly stressed part of the entir... Annealing Of Rifle Components At Springfield Armory In general, all forgings of the components of the arms manufa... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... Liberty Motor Connecting Rods The requirements for materials for the Liberty motor connecti... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Annealing ANNEALING can be done by heating to temperatures ranging from... Ebbw Vale And The Bessemer Process After his British Association address in August 1856, Besseme... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... |
Gas Consumption For CarburizingCategory: CASE-HARDENING OR SURFACE-CARBURIZING Although the advantages offered by the gas-fired furnace for carburizing have been generally recognized in the past from points of view as close temperature regulation, decreased attendance, and greater convenience, very little information has been published regarding the consumption of gas for this process. It has therefore been a matter of great difficulty to obtain authentic information upon this point, either from makers or users of such furnaces. In view of this, the details of actual consumption of gas on a regular customer's order job will be of interest. The Revergen furnace, manufactured by the Davis Furnace Company, Luton, Bedford, England, was used on this job, and is provided with regenerators and fired with illuminating gas at ordinary pressure, the air being introduced to the furnace at a slight pressure of 3 to 4 in. water gage. The material was charged into a cold furnace, raised to 1,652 deg.F., and maintained at that temperature for 8 hr. to give the necessary depth of case. The work consisted of automobile gears packed in six boxes, the total weight being 713 lb. The required temperature of 1,652 deg.F. was obtained in 70 min. from lighting up, and a summary of the data is shown in the following table: Cubic Foot Total Per Pound Number of of Load Cubic Foot Gas to raise furnace and charge from cold to 1,652 deg.F., 70 min. 1.29 925 Gas to maintain 1,652 deg.F. for 1st hour 0.38 275 Gas to maintain 1,652 deg.F. for 2nd hour 0.42 300 Gas to maintain 1,652 deg.F. for 3rd hour 0.38 275 Gas to maintain 1,652 deg.F. for 4th hour 0.42 300 Gas to maintain 1,652 deg.F. for 5th hour 0.49 350 Gas to maintain 1,652 deg.F. for 6th hour 0.49 350 Gas to maintain 1,652 deg.F. for 7th hour 0.45 325 Gas to maintain 1,652 deg.F. for 8th hour 0.45 325 The overall gas consumption for this run of 9 hr. 10 min. was only 4.8 cu. ft. per pound of load. Next: The Care Of Carburizing Compounds Previous: A Satisfactory Luting Mixture
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