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Steel MakingRefining The GrainThis is remedied by reheating the piece to a temperature slig... Hardening High-speed Steel In forging use coke for fuel in the forge. Heat steel slowly ... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... Hardness Testing The word hardness is used to express various properties of me... Preventing Cracks In Hardening The blacksmith in the small shop, where equipment is usually ... Knowing What Takes Place How are we to know if we have given a piece of steel the ver... Properties Of Alloy Steels The following table shows the percentages of carbon, manganes... Surface Carburizing Carburizing, commonly called case-hardening, is the art of pr... The Effect The heating at 1,600 deg.F. gives the first heat treatment w... Effects Of Proper Annealing Proper annealing of low-carbon steels causes a complete solu... William Kelly's Air-boiling Process An account of Bessemer's address to the British Association w... Vanadium Vanadium has a very marked effect upon alloy steels rich in c... Making Steel Balls Steel balls are made from rods or coils according to size, st... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... High Speed Steel For centuries the secret art of making tool steel was handed ... Robert Mushet Robert (Forester) Mushet (1811-1891), born in the Forest of D... Ebbw Vale And The Bessemer Process After his British Association address in August 1856, Besseme... Double Annealing Water annealing consists in heating the piece, allowing it to... Annealing Of Rifle Components At Springfield Armory In general, all forgings of the components of the arms manufa... Short Method Of Treatment In the new method, the packed pots are run into the case-har... |
Restoring Overheated SteelCategory: HARDENING CARBON STEEL FOR TOOLS The effect of heat treatment on overheated steel is shown graphically in Fig. 65 to the series of illustrations on pages 137 to 144. This was prepared by Thos. Firth & Sons, Ltd., Sheffield, England. The center piece Fig. 65 represents a block of steel weighing about 25 lb. The central hole accommodated a thermo-couple which was attached to an autographic recorder. The curve is a copy of the temperature record during heating and cooling. Into the holes in the side of the block small pegs of overheated mild steel were inserted. One peg was withdrawn and quenched at each of the temperatures indicated by the numbered arrows, and after suitable preparation these pegs were photographed in order to show the changes in structure taking place during heating and cooling operations. The illustrations here reproduced are selected from those photographs with the object of presenting pictorially the changes involved in the refining of overheated steel or steel castings. Next: Hardening Carbon Steel For Tools Previous: S A E Heat Treatments
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