Teach You The Difference Between Cast Iron Valves And Cast Steel Valves

The main difference between cast iron and iron steel valves is the carbon content, which directly affects the strength and plasticity of the steel. Carbon steel is also called carbon steel, an iron-carbon alloy with a carbon content of less than 2%. In addition to carbon, carbon steel generally contains small amounts of silicon, manganese, sulfur, and phosphorus. According to its use, carbon steel can be divided into three categories: carbon structural steel, carbon tool steel, and free-cutting structural steel. Carbon structural steel is divided into two types: building structural steel and machine-made structural steel. According to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%) and medium carbon steel (WC0.25%-0.6%) and high carbon steel (WC>0.6%). According to the phosphorus and sulfur content, carbon steel can be divided into ordinary carbon steel (higher phosphorus and sulfur content), high-quality carbon steel (lower phosphorus and sulfur content) and High-grade high-quality steel (lower phosphorus and sulfur content) Generally, the higher the carbon content in carbon steel, the higher the hardness and strength, but the lower plasticity.

 

Cast iron is stronger and more brittle than cast steel, and cast steel has better plasticity and toughness than cast iron. Therefore, cast iron is generally used in pipes with relatively low pressure, and can only be used at room temperature. On pipes, due to the increase in pressure or temperature, the valve will have a certain amount of slight deformation, which is detrimental to cast iron valves.

Compared with cast iron valves, cast steel valves can be used in pipelines with relatively high pressure or temperature.

Application of cast iron valves: For example, we often see valves used for conveying tap water pipes. The valve surfaces are sprayed with black paint. These valves are cast iron valves.