In this process, steel is heated in the presence of ammonia environment. Heat Treatment of Metals Introduction . Tempering: This heat treatment process carried out for steel parts which have been already hardened, in order to reduce bitterness and unequal stress develop as a result of hardening. Tempering process decomposes the martensite into a ferrite-cementite mixture and thus the properties of steel are strongly affected. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 43abb2-MjM3M Tempering … It has a nice shine, snaps when you break it, and does not melt as you are trying to pick it up. (i) At low tempering temperature (upto 200° to 250°C), (a) Bending and true tensile strength are increased, and (b) Hardness changes to a small extent. Tempering, in metallurgy, process of improving the characteristics of a metal, especially steel, by heating it to a high temperature, though below the melting point, then cooling it, usually in air.The process has the effect of toughening by lessening brittleness and reducing internal stresses. Keywords: annealing , … 4. Tempering in conventio nal fashion. This process reduces brittleness and hardness but improves the tensile strength of Steel. Nitriding is the process of the case or surface hardening in which nitrogen gas is employed to obtain hard skin of the metal. Tempered glass is glass that has been heat-treated to make it harder, more resistant to heat, and break safely to prevent injury. The process is relatively straightforward, although it does require some specific equipment or facilities. Heat Treatment Heat Treatment process is a series of operations involving the heating and cooling of metals in the solid state. Medina Kaknjo Technical Expert-Heat Treat PTO Supplier Technical Assistance Global Purchasing. Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys.Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air. Tempering of steel is a process in which previously hardened or normalized steel is heated to a temperature below the lower critical temperature and cooled at a suitable rate, primarily to increase ductility and toughness but also to increase the grain size of the matrix. It is applied to cutting tools, tools, and gears, which are hardened by the hardening process. AUSTEMPERING It yields desirable mechanical properties including: Higher ductility, toughness, and strength for a given hardness. 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