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Difference between Cast Iron Valve and Carbon Steel Valve

Cast iron gate valve manufacturer to share with you: the main difference between cast iron valves and carbon steel valves is the carbon content, which directly affects the strength and plasticity of steel. Carbon steel is also called carbon steel, iron-carbon alloy with carbon content WC less than 2%. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur, and phosphorus. According to use, carbon steel can be divided into 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. Carbon steel can be divided into low carbon steel (WC ≤ 0.25%) and medium carbon steel (WC 0.25%-0.6%) according to the carbon content. And high-carbon steel (WC> 0.6%) carbon steel can be divided into ordinary carbon steel (containing high phosphorus and sulfur), high-quality carbon steel (containing low phosphorus and sulfur), and High-quality steel (with lower phosphorus and sulfur) Generally, the higher the carbon content in carbon steel, the higher the hardness and the higher the strength, but the lower the plasticity.
Cast iron valve china: iron-carbon alloy with a carbon content of more than 2%. industrial cast iron generally has a carbon content of 2% to 4%. Carbon exists mostly in the form of graphite in cast iron, and sometimes also in the form of cementite. In addition to carbon, cast iron also contains 1% to 3% silicon, as well as elements such as manganese, phosphorus, and sulfur. Alloy cast iron also contains elements such as nickel, chromium, molybdenum, aluminum, copper, boron, and vanadium. Carbon and silicon are the main elements affecting the microstructure and properties of cast iron. Cast iron can be divided into: ① gray cast iron. The carbon content is high (2.7% to 4.0%). Carbon mainly exists in the form of flake graphite, and the fracture is gray, referred to as gray iron. Low melting point (1145 ~ 1250 ℃), small shrinkage during solidification, compressive strength and hardness close to carbon steel, good shock absorption. Used for manufacturing machine parts, cylinders, boxes and other structural parts. ② white cast iron. The content of carbon and silicon is low. Carbon mainly exists in the form of cementite, and the fracture is silver-white. Shrinkage is large during solidification, and it is easy to produce shrinkage holes and cracks. High hardness and brittleness, can not bear impact load. Mostly used as a blank for malleable cast iron and for making wear-resistant parts. ③ malleable cast iron. Obtained after annealing of white cast iron, graphite is distributed in floc, referred to as ductile iron. Its microstructure is uniform, wear-resistant, and has good plasticity and toughness. Used to manufacture parts with complex shapes and strong dynamic loads. ④ Ductile iron. The gray cast iron hot metal is obtained after spheroidizing treatment, and the precipitated graphite is spherical, referred to as ductile iron. It has higher strength, better toughness and plasticity than ordinary gray cast iron. Used in the manufacture of internal combustion engines, automobile parts and agricultural machinery. ⑤ Vermicular graphite cast iron. The gray cast iron hot metal was obtained after the creep treatment, and the precipitated graphite was worm-shaped. The mechanical properties are similar to those of spheroidal graphite cast iron. The casting properties are between gray cast iron and spheroidal graphite cast iron. Parts used in the manufacture of automobiles. ⑥ alloy cast iron. Ordinary cast iron is obtained by adding appropriate alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.). The alloy element changes the matrix structure of cast iron, so that it has corresponding heat resistance, wear resistance, corrosion resistance, low temperature resistance, or non-magnetic properties. Cast iron valves are used to manufacture parts for mining, chemical machinery and instruments, meters, etc.
Cast iron valves are widely used in waste building water supply pipes, waste water drainage pipes, building drainage pipes, buried drainage pipes, gas transmission pipes, electrical bushings, agricultural pipes, industrial pipes and other occasions. Then we use Chinese cast iron What should you pay attention to when you use cast iron gate valve china?
First, check whether the valve and gate valve coupling bolts are tightened. If they are not tightened, the internal seal ring and the flange sealing groove surface will not be sufficiently combined to cause leakage. The bolts and nuts should be inspected in order according to the installation sequence, and all bolts should be tightened until the seal ring is pressed. Secondly check the size and accuracy of the seal ring and flange seal groove surface. If the size of the seal contact surface does not match or is too rough, the seal ring should be repaired or replaced. In addition, check whether there are sand holes, pitting, trachoma or impurities in the contact surface between the gasket ring and the flange sealing groove. If there are such defects, they must be repaired, repaired and cleaned accordingly. When bonnet leakage is encountered, it is mainly manifested in leakage of packing seals. Verify that the seals are selected correctly and match the seal groove. If there is a problem in this area, replace the seal ring or repair the seal groove. Secondly check the seal for deformation, burrs, fracturing, twisting, etc. If this happens, replace the seal. Check whether the sealing surface of each sealing groove is rough or has other defects. Defective parts should be replaced.

Cast Iron Gate Valve China

Cast Iron Gate Valve China

 

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