Heat resistant steel furnace is used in heat treatment furnace accessories, it is commonly used material is CrMnN, Ni7N, 2520 and other heat resistant steel, the degree of heat resistance of different materials are also different. For example, cr-Mn-N furnace tank is suitable for 850℃ ~ 900℃; ZG35Cr24Ni7N heat treatment equipment vacuum furnace suitable for 900℃ ~ 1050℃; ZG40Cr25Ni20Si2 furnace tank is suitable for 1050℃ ~ 1150℃.
High temperature strength refers to the ability of steel to withstand mechanical loads for a long time at high temperatures. Steel is softened under mechanical load at high temperature, that is, its strength decreases with increasing temperature. The second is creep, that is, under the action of constant stress, the plastic deformation increases slowly with the extension of time, and the plastic deformation of steel at high temperature is caused by intra - grain slip and grain boundary slip. Alloying is usually used to increase the high temperature strength of steel. It is also the addition of alloying elements to steel to enhance the bonding strength between atoms and to form favorable structures. By adding chromium, molybdenum, tungsten, vanadium, titanium, etc., the matrix of steel can be strengthened, the recrystallization temperature can be raised, and enhanced phase carbide or intermetallic compounds can be formed, such as Cr23C6, VC, TiC, etc. These hardened phases are stable at high temperatures, insoluble, do not aggregate and grow, and maintain their hardness. Nickel was added mainly to get austenite. Austenitic atoms are more closely arranged than ferrite atoms, and the bonding force between atoms is stronger. So austenite is stronger at high temperatures. It can be seen that the high-temperature strength of heat-resistant steel is not only related to the chemical composition, but also related to the structure.
Heat resisting steel furnace can be divided into cover furnace, nitriding furnace, carburizing furnace, star anise furnace, cylinder furnace, heat treatment furnace, CRMNN furnace, centrifugal furnace, etc. It can also produce non-standard furnace tank according to customers' requirements, which can withstand 1150 degree high temperature, and not easy to denatured, heat and corrosion resistant.
At present, there are two kinds of heat-resistant steel furnace tank, one is casting, one is welding, welding material, Swedish plate 310S as the best, the life can go to 2-5 years, and this material of heat-resistant steel furnace tank weight is lighter, heat faster, more energy saving, quality is the best.
Heat resistant steel furnace tank, of course, also can use the centrifugal casting process, apply for centrifugal casting process of the seamless pipe in tank top casting furnace, tube wall tissue density high, uniform wall thickness fluctuation, more solid and durable, not easy appear high temperature deformation, the service life of the warranty in more than one year, product advantages more apparent.
Among the many heat-resistant steel brands, the following factors must be considered comprehensively when choosing heat-resistant steel that meets the working conditions of the cement plant:
(1) The working temperature of heat-resistant steel castings. Operating temperature refers to the highest, normal and lowest temperatures and the rate of change of temperature.
(2) Mechanical load of heat-resistant steel castings.
(3) Gas in contact with heat-resistant steel castings and their conditions (including wind speed dust content, chemical composition, etc.).
(4) The price should be low, where can use chromium, nickel content low cast heat resistant steel, not high chromium, nickel content.
The experience of using heat-resistant steel castings should be constantly summarized and accumulated in cement plant. If there is failure problem in use and it is proved by analysis that the abnormal scrap of heat-resistant steel castings is caused by improper material selection, the manufacturer can contact with the manufacturer to prevent failure by studying the material selection. The manufacturer should provide the material selection data and indicate the direction to the using factory.
In a word, heat-resistant steel furnace and tank products have a series of advantages, such as high temperature resistance, high strength, not easy to deformation, good oxidation resistance, etc., so the furnace and tank are widely used in heat treatment, can also meet the special casting requirements of metallurgy, mining, petrochemical, shipping, building materials, electric power, light industry, machinery, military industry and other industries.
In fact, in addition to heat resistant steel pot, similar to the heat resistant steel workpiece there are many, are to meet the special requirements of the processing was introduced. Metal heat treatment equipment as a specific special properties of material, heat resistant steel has many USES, can play an important role in various industries.
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