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Steel MakingLathe And Planer ToolsTO FORGE.--Gently warm the steel to remove any chill is parti... Composition And Properties Of Steel It is a remarkable fact that one can look through a dozen tex... An Automatic Temperature Control Pyrometer Automatic temperature control instruments are similar to the ... Heat Treatment Of Punches And Dies Shears Taps Etc HEATING.--The degree to which tools of the above classes shou... Hardening Steel is hardened by quenching from above the upper critical.... The Theory Of Tempering Steel that has been hardened is generally harder and more br... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... Placing Of Pyrometers When installing a pyrometer, care should be taken that it re... Piston Pin The piston pin on an aviation engine must possess maximum res... Drop Forging Dies The kind of steel used in the die of course influences the he... Quenching It is considered good practice to quench alloy steels from th... Furnace Data In order to give definite information concerning furnaces, fu... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Manganese MANGANESE is a metal much like iron. Its chemical symbol is M... Hardness Testing The word hardness is used to express various properties of me... Carbon Steels For Different Tools All users of tool steels should carefully study the different... Preventing Carburizing By Copper-plating Copper-plating has been found effective and must have a thick... Molybdenum Molybdenum steels have been made commercially for twenty-five... Blending The Compound Essentially, this consists of the sturdy, power-driven separa... |
High-carbon Machinery SteelCategory: ANNEALING The carbon content of this steel is above 30 points and is hardly ever above 60 points or 0.60 per cent. Annealing such steel is generally in quantity production and does not require the care that the other steels need because it is very largely a much cheaper product and a great deal of material is generally removed from the outside surface. The purpose for which this steel is annealed is a deciding factor as to what heat to give it. If it is for machineability only, the steel requires to be brought up slowly to just below the critical and then slowly cooled in the furnace or ash pit. It must be thoroughly covered so that there will be no access of cool air. If the annealing is to increase ductility to the maximum extent it should be slowly heated to slightly over the upper critical temperature and kept at this heat for a length of time necessary for a thorough penetration to the core, after which it can be cooled to about 1,200 deg.F., then reheated to about 1,360 deg.F., when it can be removed and put in an ash pit or covered with lime. If the annealing is just to relieve strains, slow heating is not necessary, but the steel must be brought up to a temperature not much less than a forging or rolling heat and gradually cooled. Covering in this case is only necessary in steel of a carbon content of more than 40 points. Next: Annealing In Bone Previous: Annealing Alloy Steel
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