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Steel MakingEffect Of Different Carburizing Material[Illustrations: FIGS. 33 to 37.] Each of these different p... Carbon Steels For Different Tools All users of tool steels should carefully study the different... S A E Heat Treatments The Society of Automotive Engineers have adopted certain heat... Hardening Carbon Steel For Tools For years the toolmaker had full sway in regard to make of st... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Hardening Steel is hardened by quenching from above the upper critical.... Quenching It is considered good practice to quench alloy steels from th... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... Blending The Compound Essentially, this consists of the sturdy, power-driven separa... Corrosion This steel like any other steel when distorted by cold worki... Heating Of Manganese Steel Another form of heat-treating furnace is that which is used ... Tungsten Tungsten, as an alloy in steel, has been known and used for a... Silicon SILICON is a very widespread element (symbol Si), being an es... Heat-treating Department The heat-treating department occupies an L-shaped building. ... Machineability Reheating for machine ability was done at 100 deg. less than ... Effect Of A Small Amount Of Copper In Medium-carbon Steel This shows the result of tests by C. R. Hayward and A. B. Joh... Hardening High-speed Steels We will now take up the matter of hardening high-speed steels... Mushet And Bessemer That Mushet was "used" by Ebbw Vale against Bessemer is, perh... Chromium Chromium when alloyed with steel, has the characteristic func... Quality And Structure The quality of high-speed steel is dependent to a very great ... |
Annealing Of High-speed SteelCategory: ANNEALING For annealing high-speed steel, some makers recommend using ground mica, charcoal, lime, fine dry ashes or lake sand as a packing in the annealing boxes. Mixtures of one part charcoal, one part lime and three parts of sand are also suggested, or two parts of ashes may be substituted for the one part of lime. To bring about the softest structure or machine ability of high-speed steel, it should be packed in charcoal in boxes or pipes, carefully sealed at all points, so that no gases will escape or air be admitted. It should be heated slowly to not less than 1,450 deg.F. and the steel must not be removed from its packing until it is cool. Slow heating means that the high heat must have penetrated to the very core of the steel. When the steel is heated clear through it has been in the furnace long enough. If the steel can remain in the furnace and cool down with it, there will be no danger of air blasts or sudden or uneven cooling. If not, remove the box and cover quickly with dry ashes, sand or lime until it becomes cold. Too high a heat or maintaining the heat for too long a period, produces a harsh, coarse grain and greatly increases the liability to crack in hardening. It also reduces the strength and toughness of the steel. Steel which is to be used for making tools with teeth, such as taps, reamers and milling cutters, should not be annealed too much. When the steel is too soft it is more apt to tear in cutting and makes it more difficult to cut a smooth thread or other surface. Moderate annealing is found best for tools of this kind. Next: Tool Or Crucible Steel Previous: Annealing
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