Due to the microstructure of nodular graphite cast iron, the technical requirements of cast iron manhole cover, 1, to reduce vibration capacity, ductile iron is better than cast steel, so it is more conducive to reduce stress。 2。 One of the important reasons for the selection of nodular cast iron is that the ductile iron is lower than the cost of the cast steel。 The low cost of ductile iron makes this material more popular, higher casting efficiency, and less machining cost of ductile iron。
Strong corrosion resistance. In the water jet corrosion test, the corrosion amount of ninety days is only 1/40 of the steel tube and the 1/10 of the ash iron pipe. The service life is 2 times that of the gray iron pipe and 5 times that of the ordinary steel pipe. Good sex. The elongation rate is more than 7%, similar to high carbon steel, and iron material extension rate is zero.
The strength is high. The tensile strength, yield strength, B = 420MPa, s = 300MPa, with the same low carbon steel, is three times the iron material. The strength of the ductile iron is comparable to the strength of the cast steel. The nodular cast iron has a higher yield strength, the yield strength is lowest 40K, and the yield strength of the cast steel is only 36K. In most of the municipal applications, such as water, brine, steam, and so on, the corrosion resistance and oxidation resistance of spheroidal graphite cast iron exceed the cast steel.
Characteristics of Ji'nan spheroidal graphite cast iron well cover:
1, the appearance is beautiful: the line is simple. Silver appearance, modern trend.
2, the best drainage: the water leakage area is 83.3%, which is more than two times the cast iron.
3。 Anti-theft design: the cover and the frame are articulated with the hinges。 The security, security, and the opening are convenient。
4, save investment: large span. The heavy load, save the cost of replacement than stolen words crushed cast ironto.
5、高 强 度：强度和韧性远高于铸铁，可用于码头，机场等大跨度和重载荷的环境。
5, high strength: strength and toughness far higher than cast iron, can be used in wharf, airport and other large span and heavy load environment。
6、规 格 多：满足不同环境，载荷。跨度，尺寸及形状所需。
6, many specifications: to meet the different environment, load。 Span, size and shape required。
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