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History of nodular cast iron ( 2)

by:XEX     2021-02-12
History of nodular cast iron ( 1) Experimental study on the big cross section, Wall thickness greater than 120 mm) Ductile iron metallurgical factors and the corresponding production measures. Using the right amount of yttrium base heavy rare earth compound nodulizing agent, forced cooling, directional solidification, delay the inoculation, when it is necessary to add trace antimony and bismuth, can prevent nodular cast iron center pieces of graphite distortion and loose organization, etc. , has been successfully made 38 tons of large complicated structure, 17. 5 tonnes of diesel body, cross section of 805 mm of nodular cast iron roll, etc. ( 2) Rare earth magnesium nodular cast iron. In terms of high strength low alloy nodular cast iron, besides more research on copper, molybdenum, also studied the nickel, niobium, etc. In the use of natural vanadium titanium cast iron production of vanadium titanium alloy nodular cast iron, some units in a large number of domestic and systematic work. Although manganese in nodular cast iron in performance is not stable, but years of research and production application system, has obtained the remarkable economic benefits. ( 3) Austenitic - The research and application of bainite ductile cast iron. In the early 1970 s, China almost at the same time, the United States, Finland three countries announced research success has high strength, high toughness of austenitic - The bainite ductile cast iron ( Internationally known collectively ADI) , this kind of material of the tensile strength of 1000 mpa, so it is widely used in gear and a variety of structures, compared with alloy steel, the - Bei nodular cast iron has a remarkable economic benefit and social benefit. ( 4) System to determine the mechanical properties of rare earth magnesium nodular cast iron and other performance, provide the relevant data for designers. Determination of the proportion of the rare earth magnesium nodular cast iron, thermal conductivity, electrical magnetic, such as physical properties, combined with metallographic standard graphite was studied and the base structure on the properties of nodular cast iron are studied. Systematically measured the ferritic nodular cast iron at room temperature, low temperature, under the condition of the static and dynamic performance. In addition, the stress and strain performance of rare earth magnesium nodular cast iron was studied, small energy impact resistance and fracture toughness, and used to guide production. Combined with the application of ductile iron gear, but also systematically studies the bending fatigue strength and contact fatigue strength of ductile iron, and the ductile iron gear pitting and spalling mechanism, etc. ( 5) As-cast pearlite nodular cast iron crankshaft and as-cast ferritic nodular cast iron automobile chassis parts, respectively the second car factory in China, nanjing automobile factory, and the first car factory have been put into production. This marked the as-cast ductile iron production in China has reached the high level. Corresponding outside the package of desulfurization, duplex melting, instantaneous inoculation, inoculation technology and audio test and thermal analysis quick analysis techniques such as the adoption of the marked the our country a lot of water in the production of automobile castings technology with the international advanced level of the gap is narrowing. ( 6) Ductile iron pipe and horizontal continuous casting ductile iron material. Has built several ductile cast iron pipe plant in our country, and in recent years, there will be several ductile cast iron pipe plant built. In 2000, our annual production of centrifugal casting ductile iron pipes up to 900000 tons. In addition, our country developed by horizontal continuous casting of nodular cast iron profiles production line has been through the national identification, and there have been many enterprises put into production. Coupled with the introduction of a production line in our country, to 2002, the annual output capacity of tens of thousands of tons of nodular cast iron material.
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