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Steel MakingThe Thermo-coupleWith the application of the thermo-couple, the measurement of... Heat Treatment Of Milling Cutters Drills Reamers Etc THE FIRE.--Gas and electric furnaces designed for high heats ... Steel Before The 1850's In spite of a rapid increase in the use of machines and the ... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... Hardening High-speed Steel In forging use coke for fuel in the forge. Heat steel slowly ... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... Heat Treatment Of Lathe Planer And Similar Tools FIRE.--For these tools a good fire is one made of hard foundr... Application Of Liberty Engine Materials To The Automotive Industry The success of the Liberty engine program was an engineer... Steel Can Be Worked Cold As noted above, steel can be worked cold, as in the case of ... Complete Calibration Of Pyrometers For the complete calibration of a thermo-couple of unknown e... Heat Treatment Of Gear Blanks This section is based on a paper read before the American Gea... Annealing Work With the exception of several of the higher types of alloy s... Tungsten Tungsten, as an alloy in steel, has been known and used for a... Connecting Rods The material used for all connecting rods on the Liberty engi... Pyrometry And Pyrometers A knowledge of the fundamental principles of pyrometry, or th... Quality And Structure The quality of high-speed steel is dependent to a very great ... Oil-hardening Steel Heat slowly and uniformly to 1,450 deg.F. and forge thorough... Placing The Thermo-couples The following illustrations from the Taylor Instrument Compan... Protective Screens For Furnaces Workmen needlessly exposed to the flames, heat and glare from... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... |
Double AnnealingCategory: HARDENING CARBON STEEL FOR TOOLS Water annealing consists in heating the piece, allowing it to cool in air until it loses its red heat and becomes black and then immediately quenching it in water. This plan works well for very low-carbon steel; but for high-carbon steel what is known as the double annealing treatment must be given, provided results are wanted quickly. The process consists in heating the steel quickly to 200 deg. or more above the upper critical, cooling in air down through the recalescence point, then reheating it to just above the critical point and again cooling slowly through the recalescence, then quenching in oil. This process retains in the steel a fine-grained structure combined with softness. Next: Quenching Tool Steel Previous: Annealing To Relieve Internal Stresses
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