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...
As we all know, the formation of shrinkage cavity and porosity of ductile iron is determined by its solidification characteristics, solidification process and production process. The solidification and shrinkage porosity characteristics of ductile iron are very complex, and there are many influencing factors. Therefore, the formation mechanism of shrinkage...
High strength ductile iron is an important engineering structural material. Although it came out late, it has good machinability and low manufacturing cost. Now it has been widely used to manufacture parts with complex stress and high requirements of strength, toughness and wear resistance, such as automobile rear axle,...
(1) The hot spot is at the top of the container, and the hot spot solidifies at last and the feeding is blocked by the surrounding, so the feeding condition is poor, and there is a great tendency to produce shrinkage defects. In order to reduce the adverse effects...
The necking riser is used at the top of the spent fuel container, and the riser is designed according to the sectional proportion method. The wall thickness of spent fuel container made of ductile iron is 520mm Dr = 0.6 ＞＜ 520 = 312mm, rounded to 320mm; HR =...