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Generation and Prevention of Subcutaneous Porosity in Ductile Iron Castings Produced by Tidal Coal Powder Sand
Subcutaneous porosity is the most common casting defect in the production of ductile iron castings, especially thin and small castings. The causes and how to prevent it are for reference.
2012
09-29
Efficient and Long-lasting Compound Inoculant for Cast Iron
(1) In modern cast iron production, inoculation treatment is an extremely important process link. The purpose of inoculation treatment is to eliminate white mouth, improve processing performance, refine eutectic group, promote A- type graphite, make graphite thicker and shorter, end blunt, shape deformation and bending, uniform distribution of graphite, improve body structure, improve mechanical properties, reduce section sensitivity, etc. For ductile iron, it is to refine the graphite ball while refining the eutectic group, the number of balls increases, the ball diameter becomes smaller, the roundness is improved, the spheroidization level is improved, the body organization is improved, and the comprehensive performance of the ductile iron is improved. Improper handling of cast iron inoculation will also produce some side effects:
09-28
"GGG40 cast ball ink casting performance test research and production test"
In the 1980 s, all kinds of casting research institutes and schools all over the country organized casting experts to devote themselves to the research and experimental research of cast high toughness ferrite ductile iron. At that time, the newly established China Heavy Duty Truck Group Company imported more than 85% of the castings of Austrian STEYR heavy duty trucks from Germany standard DINGGG40 ductile iron (equivalent to the new national standards GB and QT400-15). In order to make STEYR heavy duty trucks localized, China Heavy Duty Truck Group Company gave Shaanxi Heavy Duty Truck the scientific research task of jointly developing and producing cast GGG40 in cooperation with Xi 'an Jiaotong University. At that time, Shaanxi Heavy Duty Truck
