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Furnace bottom plate
The furnace bottom plate can be divided into silicon carbide furnace bottom plate, heat-resistant steel furnace bottom plate, and stainless steel furnace bottom plate according to the material of the furnace bottom plate. According to their applications, they can be divided into wear-resistant and heat-resistant furnace bottom plates, heat treatment furnace bottom plates, box type electric furnace bottom plates, heat treatment electric furnace bottom plates, trolley furnace bottom plates, resistance furnace bottom plates, well furnace bottom plates, mesh belt furnace bottom plates, fan-shaped furnace bottom plates, and combination furnace bottom plates. The furnace floor can be divided into 15KW furnace floor, 30KW furnace floor, 45KW furnace floor, 60KW furnace floor, 75KW furnace floor, 90KW furnace floor, 100KW furnace floor, 120KW furnace floor, 150KW furnace floor, etc. according to the power of the furnace type used.
The heat-resistant steel furnace bottom plate is usually cast from heat-resistant steel, and the materials can be divided into Cr-Mn-N (suitable for temperatures below 850 ℃), 3Cr24Ni7SiNRe, suitable for temperatures between 850 ℃ and 1050 ℃ (can replace high chromium nickel steel), and 1Cr25Ni20Si2, suitable for temperatures between 1050 ℃ and 1200 ℃.
The furnace bottom plate is used to carry heat-treated workpieces for high-temperature annealing. The lifespan of the furnace floor is related to the circumferential stress of the furnace floor. The finite element method is used to simulate the thermal stress generated by the furnace bottom plate during the high-temperature annealing process when the temperature changes. During high-temperature annealing, due to uneven temperature inside the furnace floor, the maximum thermal stress always occurs at the outer edge of the furnace floor. Tensile stress is the fundamental cause of crack formation.
During the cooling process, the edge of the furnace bottom plate is subjected to tensile stress, and due to high temperature, the strength limit of the furnace bottom plate is relatively low, making it most prone to cracking. Simulate the maximum circumferential thermal stress of the furnace bottom plate under different structural parameters under the same temperature load, and search for optimized furnace bottom plate structural parameters. The reduction of corrugated edges and column radii can effectively reduce the thermal stress generated at the outer edge of the furnace floor.
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