In order to avoid the purchase of gray iron bars and ball iron bars, HEBEI KC cast iron profiles teach you to distinguish between ball iron bars and gray iron bars.
        1. The graphite of gray iron is flat and flat, and the graphite of ductile iron is spherical. The spheroidal cast iron casts a sound similar to that of carbon steel, indicating that the spheroidal graphite cast iron is good. The gray iron tapping sounds, it is very stuffy.
        2, on the issue of spheroidization rate, it can be said that the same is the product of ductile iron, the spheroidization rate is different, the quality is also different, the price is also very different. The general factory has a spheroidization rate of 85% as a qualified product. The spheroidization rate of 85% or less is because the temperature of the molten iron is low when the casting is not spheroidized, and the pressure of the manufactured product does not meet the requirements.
        3. From the appearance of the fracture (not the machined surface), the ductile iron and the gray iron can be easily distinguished. It is observed with the naked eye that the grain of the gray iron fracture is coarse and grayish, and the crystal surface has a metallic luster. The fractured grain of ductile iron is very small and dark gray. If the spheroidization is good, there is almost no metallic luster. If there is whitish luster, white mouth tissue is generally present.
        4. From the perspective of smelting methods,
        Ductile iron is added to the gray iron in the smelting process to add inoculant and spheroidizing agent to make the graphite from the dispersed floc shape into a spherical shape, in order to reduce the splitting of ferrite, increase the strength, mentioned performance to achieve.
       5. From the mechanical properties, the mechanical properties of gray cast iron are lower than that of ductile iron, the mechanical properties of gray cast iron are 100-350 MPa, and the mechanical properties of ductile iron are 350-700 MPa. In addition, the ductile iron has elongation. Requirements, while gray cast iron has few requirements in this regard.