Hardness Analysis of Ductile Iron Valve Manhole Covers: Performance Advantages and Future Prospects
1. Hardness Characteristics and Scientific Basis of Ductile Iron Manhole Covers Ductile iron typically exhibits a Brinell hardness (HB) range of 140–250HB, significantly higher than that of ordinary gray cast iron (180–220HB). This superior performance originates from its unique microstructure—graphite exists in a spherical form uniformly distributed within a ferrite or pearlite matrix. Through nodularization treatment (adding magnesium and rare earth elements), ductile iron retains the...
Analysis of ductile iron manhole cover market development dynamics and technology trends in 2024
I. Market Overview: Steady Growth and Expanding Applications According to the latest industry data, China’s ductile iron manhole cover output exceeded 1.2 million tons in 2023, representing a year-on-year increase of about 8.5%. By 2025, the market size is expected to surpass 22 billion RMB. Thanks to their high strength, corrosion resistance, and long service life, ductile iron manhole covers have become an indispensable component of modern urban infrastructure. Their usage rate now exceeds...
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