By Harry Chandler
This version is an entire revision and features a good deal of latest material together with info on ferrous powder metallurgy, solid irons, extremely excessive energy steels, furnace atmospheres, quenching tactics, SPC and desktop expertise. information on over one hundred thirty five extra irons and steels were further to the previously-covered 280 alloys.
Each info sheet provides the chemical composition of the alloy, an inventory of comparable U.S. and overseas alloys, its features, and the urged warmth treating approach. lots of the compilation is going a lot additional and gives a wide selection of extra warmth treating facts resembling consultant micrographs, isothermal transformation diagrams, cooling transformation diagrams, tempering curves and knowledge on dimensional change.
Aiding you're over 800 figures, 450 micrographs, a word list of chosen warmth treating phrases and normal engineering information.
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Extra resources for Heat Treater's Guide: Practices and Procedures for Irons and Steels
Te) File-hard. (0 Tempered at 205 “C (400 “F). tg) Reheated at 8-U OC( I SSO“FJ. quenched in salt al I75 “C (350 “F). tj)Temprredat 16s 0C~3250F)andtreatedat-850C(-1300Ft Guidelines Liquid Operating Carburizing Characteristics The case produced is comparable to one obtained in gas carburizing in an atmosphere containing some ammonia. In addition, cycle times are shorter because heat up is faster, due to the excellent heat transfer characteristics of the salt bath solution. Operating Information Most of these baths contain cyanide.
The process usualI> consists of heating to a temperature below AC,. soaking for an appropriate time. then cooling-usually in air. Generally, heating to a temperature between IO and 22 “C (20 and 10 “F) below AC] produces the best combination of microstructure, hardness, and mechanical properties. Temperature controls are necessary only to prevent heating above Act. which would defeat the purpose of annealing. When Ihe sole purpose is to soften for such operations as cold sawing and cold shearing, temperatures are usually well below Act.
For con! erted frequencies. S@kless than the power input to the machine, because of losses within the machine. (b) At the operating frequency of the inductor Examples of quench rings for continuous hardening and quenching of tubular members. Courtesy of Ajax Magnethermic Corp. 38 / Heat Treater’s Guide Power Densities Required Frequency, KEZ Depth of hardening(a) in. 080-7. 090-0. 090-0. 120-O. 86 (a) For greater depths of hardening, lower kilowatt inputs are used. (b) These values are based on use of proper frequency and normal overall operating efficiency of equipment.
Heat Treater's Guide: Practices and Procedures for Irons and Steels by Harry Chandler