At present, the elongation indexes of high strength and high plasticity pearlitic ductile iron produced by domestic foundry enterprises are not unified, including qt700-7, qt700-10, qt800-5, QT800-6 and qt900-5. Pearlite Nodular Cast Iron with high strength and high plasticity was first proposed for the production of nodular cast iron...
Foreign R & D Some foundry companies such as GF, Fiat and FCD have established enterprise standards and started to produce high strength and high toughness ductile iron. 1.1 FCD of Japan The properties of high strength and high plasticity pearlitic ductile iron developed by FCD company of Japan...
The characteristics of as cast high strength and high plasticity pearlitic ductile iron are as follows: (1) Compared with ordinary nodular cast iron, although they are all pearlite and ferrite mixed matrix, the comprehensive properties of as cast high strength and high plasticity Pearlite Nodular Cast Iron with various...
At present, there are two kinds of as cast high strength and high plasticity ductile iron in China： The first one is high strength and high plasticity ductile iron with ferrite matrix as the main body, which is characterized by keeping the plasticity (elongation) index of the original brand...
Although the metallurgical quality of molten iron is affected by many factors, foundry workers have found the quantitative index of metallurgical quality, namely undercooling. Undercooling degree is an important quantitative index to judge the metallurgical quality of molten iron, which directly reflects the metallurgical quality of molten iron. It...
It is very important to select the appropriate carbon equivalent or carbon silicon content for the production of sound castings without shrinkage cavity and porosity defects, which is always a problem of great concern for ductile iron manufacturers. Theoretically, the eutectic point of Fe-C alloy is 4.3%. Cast iron...
1. Carbon, silicon and carbon equivalent When the carbon equivalent is at the eutectic point, the casting process performance is the best, the shrinkage tendency is the smallest, the concentrated shrinkage tendency is the largest, and it is the easiest to obtain dense castings by feeding during solidification. This...
Cast pig iron, ferrosilicon, ferromanganese, ferromolybdenum, pure copper and ferroniobium were used as raw materials. According to the target chemical composition (mass fraction,%) of 3.8-4.0 C, 2.7-3.2 Si, 2.3-2.8 Mn, 0.4-0.6 Mo, 0.4-0.7 Cu and 0.2-0.8 Nb, they were melted in medium frequency induction furnace at 1 450-1 500...
The structure diagram of QT600-3 gear casting produced by ZHY casting is shown in Figure 1, and the overall dimension is φ 302 mm × 66 mm, main wall thickness 56 mm, casting weight 16 kg. The casting is molded with furan resin sand and melted in 1.5 T...
Nodular cast iron is widely used in automobile parts, such as wheel hub, differential case, bracket, steering knuckle, main cover, etc. in order to improve the strength or toughness of nodular cast iron, it was realized by adjusting the matrix structure of nodular cast iron in the past. In...