What is the difference between cast iron gate valve and cast steel gate valve
The main difference between cast iron gate valve and iron steel gate valve is the carbon content, which directly affects the strength and plasticity of steel. Carbon steel is also called carbon steel, an iron-carbon alloy with a carbon content of less than 2% WC.
Carbon steel generally contains a small amount of silicon, manganese, sulfur, and phosphorus in addition to carbon. Carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free-cutting structural steel according to its purpose. Carbon structural steel is divided into two types: architectural structural steel and machine-manufactured structural steel. Generally, the higher the carbon content of carbon steel, the higher the hardness and the higher the strength, but the lower the plasticity.
Cast iron gate valve is an iron-carbon alloy with a carbon content of more than 2%. Cast iron gate valve can be divided into: 1. Gray cast iron 2. White cast iron 3. Malleable cast iron 4. Ductile cast iron 5. Vermicular graphite cast iron 6. Alloy cast iron
Generally, what we call cast iron gate valve is ductile iron, which is obtained by spheroidizing molten gray cast iron, and the precipitated graphite is spherical, referred to as ductile iron. Compared with ordinary gray cast iron, it has higher strength, better toughness and plasticity.
The cast steel gate valve is used to pour the steel of the casting. A kind of casting alloy. Cast steel is divided into cast carbon steel, cast low alloy steel and cast special steel; cast carbon steel. Cast steel with carbon as the main alloying element and a small amount of other elements. Cast low-carbon steels with a carbon content of less than 0.2%, cast medium-carbon steels with a carbon content of 0.2% to 0.5%, and cast high-carbon steels with a carbon content of more than 0.5%. As the carbon content increases, the strength and hardness of cast carbon steel increase. Cast carbon steel has high strength, plasticity and toughness, and low cost. It is used in heavy machinery to manufacture parts that bear heavy loads, such as rolling mill stands, hydraulic press bases, etc.; it is used to manufacture heavy stress on railway vehicles. Parts subject to impact, such as bolsters, side frames, wheels and couplers, etc.;
From the above material characteristics, cast iron gate valve is more rigid than cast steel, and its brittleness is greater than cast steel. Cast iron has better plasticity and toughness than cast iron gate valve, so cast iron gate valve is general It is used in pipelines with relatively low pressure, and it can only be applied to pipelines at room temperature. The increase in pressure or temperature indicates that the valve will have a certain amount of deformation, which is not good for cast iron gate valve, compared to cast iron gate valve. Iron gate valve, cast steel valve can be used in pipelines with relatively high pressure or temperature.