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Steel MakingThe Quenching TankThe quenching tank is an important feature of apparatus in c... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... Corrosion This steel like any other steel when distorted by cold worki... Heat Treatment Of Punches And Dies Shears Taps Etc HEATING.--The degree to which tools of the above classes shou... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Placing Of Pyrometers When installing a pyrometer, care should be taken that it re... Heating Of Manganese Steel Another form of heat-treating furnace is that which is used ... The Thermo-couple With the application of the thermo-couple, the measurement of... Quality And Structure The quality of high-speed steel is dependent to a very great ... Application Of Liberty Engine Materials To The Automotive Industry The success of the Liberty engine program was an engineer... Drop Forging Dies The kind of steel used in the die of course influences the he... Lathe And Planer Tools FORGING.--Gently warm the steel to remove any chill, is parti... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Forging High-speed Steel Heat very slowly and carefully to from 1,800 to 2,000 deg.F.... Properties Of Steel Steels are known by certain tests. Early tests were more or l... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... Annealing To Relieve Internal Stresses Work quenched from a high temperature and not afterward tempe... Tungsten Tungsten, as an alloy in steel, has been known and used for a... Protective Screens For Furnaces Workmen needlessly exposed to the flames, heat and glare from... |
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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