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Steel MakingCritical PointsOne of the most important means of investigating the properti... Refining The Grain This is remedied by reheating the piece to a temperature slig... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... Manganese MANGANESE is a metal much like iron. Its chemical symbol is M... Pickling The Forgings The forgings were then pickled in a hot solution of either ni... Heat-treating Equipment And Methods For Mass Production The heat-treating department of the Brown-Lipe-Chapin Company... Application Of Liberty Engine Materials To The Automotive Industry The success of the Liberty engine program was an engineer... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... Liberty Motor Connecting Rods The requirements for materials for the Liberty motor connecti... Process Of Carburizing Carburizing imparts a shell of high-carbon content to a low-... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... An Automatic Temperature Control Pyrometer Automatic temperature control instruments are similar to the ... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... Preventing Carburizing By Copper-plating Copper-plating has been found effective and must have a thick... Carbon-steel Forgings Low-stressed, carbon-steel forgings include such parts as car... Preventing Cracks In Hardening The blacksmith in the small shop, where equipment is usually ... Heat Treatment Of Milling Cutters Drills Reamers Etc THE FIRE.--Gas and electric furnaces designed for high heats ... Annealing Alloy Steel The term alloy steel, from the steel maker's point of view, r... Non-shrinking Oil-hardening Steels Certain steels have a very low rate of expansion and contract... |
Annealing WorkCategory: HEAT TREATMENT OF STEEL With the exception of several of the higher types of alloy steels, where the percentages of special elements run quite high, which causes a slight air-hardening action, the carburizing steels are soft enough for machining when air cooled from any temperature, including the finishing temperature at the hammer. This condition has led many drop-forge and manufacturing concerns to consider annealing as an unnecessary operation and expense. In many cases the drop forging has only been heated to a low temperature, often just until the piece showed color, to relieve the so-called hammer strains. While this has been only a compromise it has been better than no reheating at all, although it has not properly refined the grain, which is necessary for good machining conditions. Annealing is heating to a temperature slightly above the highest critical point and cooling slowly either in the air or in the furnace. Annealing is done to accomplish two purposes: (1) to relieve mechanical strains and (2) to soften and produce a maximum refinement of grain. Next: Process Of Carburizing Previous: Heat Treatment Of Gear Blanks
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