| This is the debt I pay Just for one riotous day, Years of regret and grief. Sorrow without relief. Pay it I will to the end-- Until the grave, my friend, Gives me a true release-- Gives me the clasp of peace. Slight was the thing I bou... Read more of The Debt at Martin Luther King.ca |  Informational.caPrivacy |
Steel MakingHardeningSteel is hardened by quenching from above the upper critical.... The Quenching Tank The quenching tank is an important feature of apparatus in c... Hardening High-speed Steels We will now take up the matter of hardening high-speed steels... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... Protectors For Thermo-couples Thermo-couples must be protected from the danger of mechanica... Liberty Motor Connecting Rods The requirements for materials for the Liberty motor connecti... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... Pyrometers For Molten Metal Pyrometers for molten metal are connected to portable thermoc... Heavy Forging Practice In heavy forging practice where the metal is being worked at... Chrome-nickel Steel Forging heat of chrome-nickel steel depends very largely on ... Molybdenum Molybdenum steels have been made commercially for twenty-five... The Forging Of Steel So much depends upon the forging of steel that this operation... Tempering Colors On Carbon Steels Opinions differ as to the temperature which is indicated by t... Heat Treatment Of Axles Parts of this general type should be heat-treated to show the... Preventing Carburizing By Copper-plating Copper-plating has been found effective and must have a thick... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... A Chromium-cobalt Steel The Latrobe Steel Company make a high-speed steel without tun... Take Time For Hardening Uneven heating and poor quenching has caused loss of many ve... Affinity Of Nickel Steel For Carbon The carbon- and nickel-steel gears are carburized separately... Quality And Structure The quality of high-speed steel is dependent to a very great ... |
Annealing MethodCategory: HEAT TREATMENT OF STEEL Forgings which are too hard to machine are put in pots with a little charcoal to cause a reducing atmosphere and to prevent scale. The covers are then luted on and the pots placed in the furnace. Carbon steel from 15 to 25 points is annealed at 1,600 deg.F. Nickel steel of the same carbon and containing in addition 3-1/2 per cent nickel is annealed at 1,450 deg.F. When the pots are heated through, they are rolled to the yard and allowed to cool. This method of annealing gives the best hardness for quick machining. The requirements in the machine operations are very rigid and, in spite of great care and probably the finest equipment of special machines in the world, a small percentage of the product fails to pass inspection during or at the completion of the machine operations. These pieces, however, are not a loss, for they play an important part in the hardening process, indicating as they do the exact depth of penetration of the carburizing material and the condition of both case and core. Next: Heat-treating Department Previous: Heat-treating Equipment And Methods For Mass Production
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