 Free Jokes.ca - Download the EBook Free Jokes |  InformationalPrivacy |
Steel MakingThe Electric ProcessThe fourth method of manufacturing steel is by the electric f... Oil-hardening Steel Heat slowly and uniformly to 1,450 deg.F. and forge thorough... Non-shrinking Oil-hardening Steels Certain steels have a very low rate of expansion and contract... Quenching Tool Steel To secure proper hardness, the cooling of quenching of steel ... Crucible Steel Crucible steel is still made by melting material in a clay or... Hardening The forgings can be hardened by cooling in still air or quen... Open Hearth Process The open hearth furnace consists of a big brick room with a l... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... Hardening Carbon Steel For Tools For years the toolmaker had full sway in regard to make of st... Judging The Heat Of Steel While the use of a pyrometer is of course the only way to hav... High Speed Steel For centuries the secret art of making tool steel was handed ... Annealing ANNEALING can be done by heating to temperatures ranging from... Phosphorus PHOSPHORUS is an element (symbol P) which enters the metal fr... Manganese MANGANESE is a metal much like iron. Its chemical symbol is M... Correction By Zero Adjustment Many pyrometers are supplied with a zero adjuster, by means ... Protective Screens For Furnaces Workmen needlessly exposed to the flames, heat and glare from... Chromium Chromium when alloyed with steel, has the characteristic func... Air-hardening Steels These steels are recommended for boring, turning and planing... Calibration Of Pyrometer With Common Salt An easy and convenient method for standardization and one whi... Compensating Leads By the use of compensating leads, formed of the same materia... |
Temperature For AnnealingCategory: HEAT TREATMENT OF STEEL Theoretically, annealing should be accomplished at a temperature at just slightly above the critical point. However, in practice the temperature is raised to a higher point in order to allow for the solution of the carbon and iron to be produced more rapidly, as the time required to produce complete solution is reduced as the temperature increases past the critical point. For annealing the simpler types of low-carbon steels the following temperatures have been found to produce uniform machining conditions on account of producing uniform fine-grain pearlite structure: 0.15 to 0.25 per cent carbon, straight carbon steel.--Heat to 1,650 deg.F. Hold at this temperature until the work is uniformly heated; pull from the furnace and cool in air. 0.15 to 0.25 per cent carbon, 1-1/2 per cent nickel, 1/2 per cent chromium steel.--Heat to 1,600 deg.F. Hold at this temperature until the work is uniformly heated; pull from the furnace and cool in air. 0.15 to 0.25 per cent carbon, 3-1/2 per cent nickel steel.--Heat to 1,575 deg.F. Hold at this temperature until the work is uniformly heated; pull from the furnace and cool in air. Next: Care In Annealing Previous: Effects Of Proper Annealing
Viewed 994 |
||||||||||||||||||||
