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Ductile iron considerations - required Nodular cast iron

by:XEX     2021-02-10
Ductile cast iron is through get spheroidal graphite spheroidization and inoculation, effectively improve the mechanical properties of cast iron, especially improve the plasticity and toughness, and the strength is higher than carbon steel. Nodular cast iron small make up will come today to tell you about the required notice. 1, strict with chemical composition, the original requirements of carbon and silicon content in liquid iron is higher than gray cast iron, manganese in lower nodular cast iron, phosphorus, sulfur content. 2, liquid iron melt temperature is higher than in gray cast iron, to compensate for the ball, and liquid iron temperature loss during processing. 3, spheroidizing treatment, namely nodulizing agent is added to iron. 4, adding nucleating agent to inoculation. 5, nodular cast iron liquidity is poorer, shrinkage is bigger, so you need a higher pouring temperature and the larger size of pouring system, riser, reasonable application of cold iron, in a sequential solidification principle. 6, heat treatment. (1) annealing. Get ferritic matrix, improve the plasticity and toughness, eliminating stress and improving the cutting performance. (2) is fire. Get the pearlitic matrix and improve the strength and abrasion resistance. (3) conditioning. Get tempered sorbite of the base structure, and good comprehensive mechanical properties, such as main shaft, crankshaft, connecting rod, etc. (4) isothermal quenching. Ductile iron supplier appearance under the complex, and the parts of high comprehensive performance requirements for bainite matrix organization, as well as high strength, high hardness, high toughness, such as the comprehensive mechanics performance, avoid cracking occurring during heat treatment such as main shaft, crankshaft, gear, etc. Above is required attention on nodular cast iron, the hope can help you. Today small make up to you at this point, let's see you next time.
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