Infrared versatile five elemental analyzer can detect carbon, silicon, manganese, sulfur, phosphorus and other elements in ductile iron. QL-HW2000E (C) infrared carbon and sulfur analyzer is a combination of light, machine, electricity, computer and analytical technology. High-tech products, wide measurement range, high precision and high accuracy, so it is the best choice for small and medium-sized enterprises
Five elemental analyzers detect various elements in ductile iron
Infrared versatile five elemental analyzer can detect carbon, silicon, manganese, sulfur, phosphorus and other elements in ductile iron. QL-HW2000E (C) infrared carbon and sulfur analyzer is a combination of light, machine, electricity, computer and analytical technology. The high-tech products, with wide measuring range, high precision and high accuracy, are the best choice for small and medium-sized enterprises. The QL-BS1000G multi-element analyzer not only automatically adjusts the wavelength continuously, but also greatly improves the accuracy and improves the accuracy of analysis and detection.
Influence of the content of five major elements on the performance of ductile iron
The chemical composition of ductile iron includes five elements: carbon, silicon, manganese, sulfur and phosphorus. For some castings with special requirements for organization and performance, a small amount of alloying elements are also included. In order to ensure the spheroidization of graphite, the spheroidal graphite cast iron must also contain trace amounts of residual spheroidizing elements. The following is a detailed description of the effects of chemical composition and its content on the properties of ductile iron:
1. The role and impact of carbon:
Carbon is the basic element of ductile iron, and carbon is high for graphitization. Since the effect of graphite on the mechanical properties of graphite is reduced to a minimum, the carbon content of ductile iron is generally high, between 3.5 and 3.9%, and the carbon equivalent is between 4.1 and 4.7%. When the casting wall is thin, the amount of spheroidal elements is large or the gestation is insufficient, the upper limit is taken; otherwise, the lower limit is taken. Selecting the carbon equivalent in the vicinity of the eutectic point not only improves the fluidity of the molten iron, but for the ductile iron, the increase in the carbon equivalent increases the self-shrinking ability of the molten iron by increasing the graphitization expansion of the cast iron during solidification. However, if the carbon content is too high, it will cause the graphite to float.
2, the role and impact of silicon
In ductile iron, silicon is the second important element, which not only can effectively reduce the tendency of white mouth, increase the amount of ferrite, but also has the effect of refining the eutectic group and improving the roundness of the graphite ball. However, silicon increases the ductile-brittle transition temperature of cast iron and reduces the impact toughness. Therefore, the silicon content should not be too high, especially when the content of manganese and phosphorus in cast iron is high, it is necessary to strictly control the silicon content.
3. The role and influence of sulfur
Sulfur is a kind of anti-spheroidizing element. It has strong affinity with spheroidizing elements such as magnesium and rare earth. The presence of sulfur will consume a lot of spheroidizing elements in molten iron, forming sulfides of magnesium and rare earth, causing slag inclusion. Casting defects such as pores. The sulfur content of nodular cast iron is generally required to be less than 0.06%.
4. The role and influence of phosphorus
Phosphorus is a harmful element. Its solubility in cast iron is extremely low. When its content is less than 0.05%, it is dissolved in the matrix and has little effect on the mechanical properties. When the content is more than 0.05%, the phosphorus is easily segregated at the boundary of the eutectic group to form a binary, ternary or composite phosphorus eutectic, which reduces the toughness of the cast iron. Phosphorus increases the ductile-brittle transition temperature of cast iron. When the phosphorus content increases, the ductile-brittle transition temperature increases.
5. The role and influence of manganese
The role of manganese in nodular cast iron is mainly in increasing the stability of pearlite and helping to form manganese carbide and iron carbide. These carbides segregate at the grain boundaries and have a great influence on the toughness of ductile iron. Manganese also increases the ductile-brittle transition temperature of ferritic ductile iron. For every 0.1% increase in manganese content, the brittle transition temperature increases by 10-12 °C. Therefore, the manganese content in ductile iron is generally as low as possible. Even in pearlitic ductile iron, the manganese content should not exceed 0.4-0.6%. Generally follow this rule.
The composition and content of alloying elements have an extremely important influence on the properties of ductile iron. When using cast iron, accurate analysis of the content of alloying elements should be carried out...
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High-frequency infrared carbon and sulfur analyzer http://
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Element Analyzer http://
Multi-element analyzer http://
Spark direct reading spectrometer http://
Carbon and sulfur analysis instrument http://
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