The feeding riser must be large enough to supply additional liquid metal during liquid shrinkage until the temperature drops below the solid phase line and the parts begin to solidify. In the same way, the modulus can be used to evaluate the shrinkage of riser, MC is the modulus...
After the casting spheroidization problem appeared, our company’s technical, quality, physical and chemical department and other departments jointly analyzed, according to the actual production, the rectification measures were determined. 1) Standardize the operation procedures and control the pouring time. 2) Adjust the blowing in sequence, the first furnace smelting...
After the occurrence of bad nodularity, our plant strengthened the detection of sulfur in the original molten iron and the molten iron after spheroidizing treatment, as well as the control of the use of recycled materials to prevent such problems. In order to produce high quality nodular iron castings,...
In the production process of nodular iron castings, in order to ensure the product quality, the tensile strength, yield strength, elongation after fracture and spheroidization rate of the test block attached to the same furnace must be within the range of the material grade requirements. This requirement must be...
1. Electrochemical test The results of electrochemical polarization test of grey cast iron and nodular cast iron are shown in Figure 1. According to the polarization curve, solid grid and hollow triangle correspond to gray cast iron and nodular cast iron respectively. Cview2.0 is used to analyze the tafei...
The mass fraction of carbon in iron is higher than 2%, while that of silicon is between 1% and 3%. Cast iron is widely used in industry because of its low cost, easy pouring, low notch sensitivity, good wear resistance and shock absorption, and corrosion resistance to some media....
The graphite of ball milled cast iron exists in the form of spheroid, which reduces the cleavage effect on the matrix, and the utilization rate of the matrix can reach 70-90%. Compared with other cast iron, ball milled cast iron has high strength, plasticity and toughness, high yield strength,...
In many occasions, some people often mention the problem of trace elements in cast iron, which is also the concern of the author. Trace elements in cast iron can be divided into: (1) microalloying elements added for specific purposes; (2) trace elements with negative effects that need to be...
Carbon can make up nodular graphite through nodulizing and inoculation . the mechanical properties , especially ductility and toughness , of iron casting has been improved availably . Thus , nodular iron casting has got higher strength than carbon steel. Nodular iron casting is a kind of high strength...