At present, it is widely used on the roads of major cities with long service life and high safety performance. But what is the difference between a gray cast iron manhole cover? The following editor will explain to you.

　　 1. In terms of shape, gray iron is flat and flake, while spheroidal ink is spherical. In terms of sound, when striking separately, the sound of gray iron is generally dull, while the sound of spheroidal ink has a sound similar to that of carbon steel.

　　2. From the point of view of smelting, nodular graphite is based on gray iron by adding inoculant and spheroidizing agent to make graphite change from dispersed clusters to spherical. The gray iron manhole cover does not add any auxiliary raw materials, and the pig iron is directly smelted into molten iron, and then poured into the manhole cover.

　　3. In terms of performance, the ductile manhole cover has high strength and good toughness, tensile strength: 500N/MM 2; elongation: 7%.

　　4. It can be distinguished from the fracture surface, which can be distinguished by the naked eye. The crystal grains of the gray iron fracture surface are relatively coarse, gray-white, and the crystal surface has a metallic luster. The fractured grains of ductile iron are very small, black-gray, and if it is of good quality, it will have a metallic luster. If it is whitish, most of it is whitish mouth tissue.

　　 In summary, the four points mentioned above are about the difference between ductile manhole covers and gray cast iron manhole covers. I hope to bring you some help. For more exciting content, please pay attention to this site.