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Metal heat treatment furnaces that play an important role in metallurgical engineering

by:Kehua     2022-08-02
Kehua is an energy-saving limited company that provides us with energy-saving solutions and more. In the metallurgical industry, metal heat treatment is a very important step. We often use metal heat treatment furnaces for heat treatment. So what knowledge does metal heat treatment furnaces contain? The editor will sort it out for you. Metal Heat Treatment Furnace Metal Heat Treatment Furnace Principle Metal heat treatment is one of the important processes in machinery manufacturing. Compared with other processing processes, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but changes the microstructure inside the workpiece. Or change the chemical composition of the workpiece surface to give or improve the performance of the workpiece. It is characterized by improving the intrinsic quality of the workpiece, which is generally not visible to the naked eye. In order to make the metal workpiece have the required mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment process is often essential. Steel is the most widely used material in the machinery industry. The microstructure of steel is complex and can be controlled by heat treatment. Therefore, heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium, etc. and their alloys can also be heat treated to change their mechanical, physical and chemical properties to obtain different performance. Heat treatment furnace A metal heat treatment furnace is a device that performs heat treatment operations such as annealing, tempering, quenching, and heating on the workpiece. Common Concepts of Metal Heat Treatment Furnaces The heat treatment process of uniform cooling in the air is normalizing. The structure after normalizing: hypoeutectoid steel is F+S, eutectoid steel is S, hypereutectoid steel is S+Fe3CⅡ The main difference between normalizing and complete annealing is that The cooling rate is faster, the purpose is to normalize the steel structure, also known as normalization. 2. Annealing: The hypoeutectoid steel workpiece is heated to 20-40 degrees above AC3, and after holding for a period of time, it is slowly cooled with the furnace (or buried in sand or cooled in lime) to a heat treatment process of cooling in air below 500 degrees 3. Solution heat treatment: Heat the alloy to a high temperature single-phase region and keep it at a constant temperature, so that the excess phase is fully dissolved into the solid solution, and then rapidly cooled to obtain a supersaturated solid solution. Heat treatment process 4. Aging: The alloy undergoes solution heat treatment or cold plasticity After deformation, its properties change with time when placed at room temperature or slightly higher than room temperature. 5. Solution treatment: fully dissolve various phases in the alloy, strengthen the solid solution and improve toughness and corrosion resistance, eliminate stress and softening, so as to continue processing and forming The strengthening phase is precipitated, hardened, and the strength is increased 8. Tempering: The quenched workpiece is heated to an appropriate temperature below the critical point AC1 for a certain period of time, and then cooled by a method that meets the requirements to obtain the required structure and properties of the heat treatment process 9. Carbon of steel Nitriding: Carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface of the steel. Traditionally, carbonitriding, also known as cyanidation, is widely used in medium-temperature gas carbonitriding and low-temperature gas carbonitriding (ie, gas soft nitriding). The main purpose of medium temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel. Low-temperature gas carbonitriding is mainly nitriding, and its main purpose is to improve the wear resistance and seizure resistance of steel. 10. Quenching and tempering treatment: Generally, the heat treatment that combines quenching and high temperature tempering is called quenching and tempering treatment. Quenching and tempering treatment is widely used in various important structural parts, especially those connecting rods, bolts, gears and shafts that work under alternating loads. The tempered sorbite structure is obtained after quenching and tempering treatment, and its mechanical properties are better than the normalized sorbite structure with the same hardness. Its hardness depends on the high temperature tempering temperature and is related to the tempering stability of the steel and the size of the workpiece section, generally between HB200-350. 11. Brazing: a heat treatment process in which two workpieces are bonded together with solder. Selection of metal heat treatment furnace equipment The selected heat treatment equipment should have high productivity, thermal efficiency and low energy consumption on the basis of meeting the requirements of the heat treatment process. Usually, when the product has enough batches, the best energy-saving effect is obtained by using special equipment. Metal heat treatment furnace measurement and control technology The measurement and control technology of heat treatment equipment has made great progress, mainly in temperature measurement and control, atmosphere measurement and control and process program control. furnace. Computer control extends to almost all fields. The working principle of the metal heat treatment furnace When the current flows to the heating coil (usually made of copper tube) that is wound into a ring or other shape. As a result, a strong magnetic beam with an instantaneous change in polarity is generated in the coil. When a heated object such as a metal is placed in the coil, the magnetic beam will penetrate the entire heated object, and in the opposite direction of the heating current inside the heated object, it will generate Correspondingly large eddy currents. Due to the existence of resistance in the heated object, a lot of Joule heat will be generated, and the temperature of the object itself will rise rapidly. To achieve the purpose of heating all metal materials. Metal Heat Treatment Furnace The above is the relevant knowledge of metal heat treatment furnaces compiled by the editor in time. After reading the above articles, do you have a clearer understanding of metal heat treatment furnaces? More relevant information is available at Kehua.
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