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Steel MakingRate Of AbsorptionAccording to Guillet, the absorption of carbon is favored by ... Hardening Steel is hardened by quenching from above the upper critical.... Carbon-steel Forgings Low-stressed, carbon-steel forgings include such parts as car... Composition Of Transmission-gear Steel If the nickel content of this steel is eliminated, and the pe... Heat Treatment Of Axles Parts of this general type should be heat-treated to show the... Heat Treatment Of Milling Cutters Drills Reamers Etc THE FIRE.--Gas and electric furnaces designed for high heats ... Annealing Work With the exception of several of the higher types of alloy s... Making Steel Balls Steel balls are made from rods or coils according to size, st... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... Placing Of Pyrometers When installing a pyrometer, care should be taken that it re... Manganese Manganese adds considerably to the tensile strength of steel,... Application Of Liberty Engine Materials To The Automotive Industry The success of the Liberty engine program was an engineer... The Quenching Tank The quenching tank is an important feature of apparatus in c... Crankshaft The crankshaft was the most highly stressed part of the entir... The Effect Of Tempering On Water-quenched Gages The following information has been supplied by Automatic and ... High Speed Steel For centuries the secret art of making tool steel was handed ... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... For Milling Cutters And Formed Tools FORGING.--Forge as before.--ANNEALING.--Place the steel in a ... Pickling The Forgings The forgings were then pickled in a hot solution of either ni... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... |
Judging The Heat Of SteelCategory: HEAT TREATMENT OF STEEL While the use of a pyrometer is of course the only way to have accurate knowledge as to the heat being used in either forging or hardening steels, a color chart will be of considerable assistance if carefully studied. These have been prepared by several of the steel companies as a guide, but it must be remembered that the colors and temperatures given are only approximate, and can be nothing else. The Magnet Test.--The critical point can also be determined by an ordinary horse-shoe magnet. Touch the steel with a magnet during the heating and when it reaches the temperature at which steel fails to attract the magnet, or in other words, loses its magnetism, the critical point has been reached. The work is heated up slowly in the furnace and the magnet applied from time to time. The steel being heated will attract the magnet until the heat reaches the critical point. The magnet is applied frequently and when the magnet is no longer attracted, the piece is at the lowest temperature at which it can be hardened properly. Quenching slightly above this point will give a tool of satisfactory hardness. The method applies only to carbon steels and will not work for modern high-speed steels. Next: Heat Treatment Of Gear Blanks Previous: Hardening
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