Ductile iron foundry production requirements and matters needing attention. - Company news -

by:XEX     2021-02-13
Ductile iron foundry production requirements and matters needing attention. 1, strict with chemical composition of 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, the baked temperature of molten iron 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 for 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. By heat treatment (6 1) Annealing get ferritic matrix, improve the plasticity and toughness, eliminating stress and improving the cutting performance. ( 2) Normalizing pearlite matrix, improve the strength and abrasion resistance. ( 3) Conditioning tempered sorbite of the base structure, and good comprehensive mechanical properties, such as main shaft, crankshaft, connecting rod, etc. ( 4) Isothermal quenching 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. Keyword: ductile iron foundry article source: http://www. hbtszz。 com/
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