The Difference Between Cast Iron Valve And Cast Steel Valve
The main difference between cast iron valves and cast steel valves is the difference between the materials of cast iron and cast steel - the carbon content is different. The carbon content directly affects the strength and plasticity of the steel.
Cast iron is more rigid and brittle than cast steel. While cast steel has better plasticity and toughness than cast iron, so cast iron generally use in pipelines with relatively low pressure, and it can only be used on pipelines at normal temperatures, because the pressure or temperature increase, the valve will have a certain slight deformation, which is unfavorable for cast iron valves. Compared with cast iron valves, Cast steel valves can use in pipelines with relatively high pressure or temperature.
The strength of ductile iron is comparable to that of cast steel. Ductile iron has a higher yield strength, and the lower limit of the yield strength is 40k, while the yield strength of cast steel is only 36k. In most municipal applications, such as water, salt water, steam, etc., the corrosion resistance and oxidation resistance of ductile iron valves exceed those of cast steel valves. Due to the spherical graphite microstructure of dry ductile iron, ductile iron is superior to dry cast steel in terms of vibration-dampening ability, so it is more conducive to reducing stress.
Therefore£¬ in low-pressure and normal-temperature environments, such as pipelines where the medium is water, steam, or oil, it is sufficient to use cast iron valves, and the cost will be much lower than that of cast steel. But if it is in a high-temperature and high-bed environment, such as some industrial pipelines, it is necessary to use our door made of cast steel to adapt to the working conditions.
?
