From the above form, we could see that in terms of similar grades of ductile iron and carbon steel, the yield strength of ductile iron is higher than that of carbon steel. The ductile iron’s yield strength is 0.6-0.65 while the carbon steel’s is 0.5-0.55. It means that the ductile iron has a much higher utilization of basic metal strength than carbon steel does. In mechanical designs, the allowable stress of a material is determined by the yield strength. Moreover, ductile iron is harder than carbon steel, so in face of multiple impacts of low energy, ductile iron has a better a resistance.
Using ductile iron for valve body can reduce weight, while carbon steel has a higher elongation rate. But valve body asks for certain stiffness to stablize the structure and to avoid leakage due to the deformation of sealed surfaces. Therefore, the elongation yield is not highly demanded.
By comparison, we could draw a conclusion that both ductile iron and carbon steel can meet the demands of the body materials for water supply and drainage valves in terms of the mechanical strength.
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