Botou Junteng Casting Co.,Ltd

The  custom led heat sink supplier  believes that in addition to the annealing of malleable cast iron and ductile iron, the cementite is decomposed into floc graphite, the purpose of heat treatment of   ductile iron parts  is in two aspects: The first is to change the matrix structure and improve the properties of cast iron. The second is to eliminate casting stress. It is worth noting that the heat treatment of the casting cannot change the original graphite form and distribution of the casting, that is, the graphite that was originally flaky or spherical is still flaky or spherical after heat treatment, and its size will not change and the distribution will not change. Ductile Iron Manhole Covers I. Limitation During the casting process, the cooling speed of the cast iron is different from the surface and the inside, forming the casting internal stress. If it is not eliminated, it will deform or even crack the part during cutting and use. To relieve st...

The application of nodular cast iron manhole covers has played a very important role in the municipal construction of our city. The appearance of many different types of nodular cast iron manhole covers has provided us with several conveniences. Now let the  aluminum electric motor shell supplier  introduce to you the characteristics of nodular cast iron manhole covers. Good toughness. The impact value is detailed with medium carbon steel, which is more than 10 times that of gray iron material. Strong corrosion resistance. In the water spray corrosion test, the amount of corrosion in the 90-day period is only 1/40 of the steel pipe, which is 1/10 of the gray iron pipe. The service life is 2 times that of gray iron pipes and 5 times that of ordinary steel pipes. Good plasticity. The elongation is ≥7%, which is similar to that of high-carbon steel, while the elongation of gray iron materials is zero. high strength. Tensile strength ób≥420MPa, yield strength ós≥300M...