| Once upon a time there dwelt near a large wood a poor wood-cutter, with his wife and two children by his former marriage, a little boy called Hansel and a girl named Gretel. He had little enough to eat; and once, when there was a great fam... Read more of Hansel And Gretel at Children Stories.ca |  Informational.caPrivacy |
Steel MakingThe Influence Of SizeThe size of the piece influences the physical properties obta... Carburizing By Gas The process of carburizing by gas, briefly mentioned on page ... Short Method Of Treatment In the new method, the packed pots are run into the case-har... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... The Care Of Carburizing Compounds Of all the opportunities for practicing economy in the heat-t... Typical Oil-fired Furnaces Several types of standard oil-fired furnaces are shown herew... Oil-hardening Steel Heat slowly and uniformly to 1,450 deg.F. and forge thorough... Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer For extremely high temperature, the optical pyrometer is lar... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... Temperatures To Use As soon as the temperature of the steel reaches 100 deg.C. (... Hints For Tool Steel Users Do not hesitate to ask for information from the maker as to t... A Satisfactory Luting Mixture A mixture of fireclay and sand will be found very satisfactor... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... Highly Stressed Parts The highly stressed parts on the Liberty engine consisted of ... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... Using Illuminating Gas The choice of a carburizing furnace depends greatly on the fa... Air-hardening Steels These steels are recommended for boring, turning and planing... Heavy Forging Practice In heavy forging practice where the metal is being worked at... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... |
Steel Can Be Worked ColdCategory: THE FORGING OF STEEL As noted above, steel can be worked cold, as in the case of cold-rolled steel. Heat treatment of cold-worked steel is a very delicate operation. Cold working hardens and strengthens steel. It also introduces internal stresses. Heat-treatments are designed to eliminate the stresses without losing the hardness and strength. This is done by tempering at a low heat. Avoid the blue range (350 to 750 deg.C.). Tempering for a considerable time just under the critical is liable to cause great brittleness. Annealing (reheating through the critical) destroys the effect of cold work. Next: Forging High-speed Steel Previous: Steel Worked In Austenitic State
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