Cast iron pipe vs carbon steel pipe

Keywords: cast iron pipe, carbon steel pipe & tube

Cast iron pipes are used for water supply, drainage and gas transmission lines, and it includes cast iron straight pipes and fittings. Low labor intensity. According to different casting methods, it is divided into continuous cast iron pipes and centrifugal cast iron pipes, among which centrifugal cast iron pipes are further divided into sand molds and metal molds. According to different materials, it is divided into gray cast iron pipe and ductile iron pipe. According to the interface form, it is divided into flexible interface, flange interface, self-anchor interface, rigid interface, etc. Among them, the flexible cast iron pipe is sealed with a rubber ring; the flange interface of the cast iron pipe is fixed with a flange, and the inner gasket is sealed with a rubber flange gasket; the rigid interface generally has a larger socket for the cast iron pipe, and after the straight pipe is inserted, it is sealed with cement. basically eliminated.

Carbon steel pipes & tube (CS pipe) are made of steel ingots or solid round steels through perforation into capillary tubes, which are then hot-rolled, cold-rolled or cold-drawn. Carbon steel pipe plays an important role in my country's steel pipe industry.

Carbon steel mainly refers to the steel whose mechanical properties depend on the carbon content in the steel. Generally, a large amount of alloying elements are not added, and it is sometimes called ordinary carbon steel or carbon steel. Carbon steel, also known as carbon steel, refers to an iron-carbon alloy with a carbon content of less than 2% WC. In addition to carbon, carbon steel generally contains small amounts of silicon, manganese, sulfur, and phosphorus. Generally, the higher the carbon content of carbon steel, the greater the hardness, the higher the strength, but the lower the plasticity.

Types of carbon steel pipes:

Carbon steel pipes can be divided into seamless steel pipes, straight seam steel pipes, spiral pipes, high frequency welded steel pipes, etc.

1) Hot rolled (extruded) seamless steel pipe : round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic test (or Flaw detection) → marking → storage

2) Cold drawn (rolled) seamless steel pipe: round tube blank→heating→piercing→heading→annealing→pickling→oiling (copper plating)→multi-pass cold drawing (cold rolling)→blank tube→heat treatment→straightening →hydrostatic test (flaw detection)→marking→storage

Carbon steel seamless pipes are divided into two types: hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes due to their different manufacturing processes. Cold drawn (rolled) tubes are divided into two types: round tubes and special-shaped tubes.

The main difference between cast iron pipes and carbon steel pipe is that they have different uses, different characteristics and different classifications.

1. Cast iron pipes with different uses are suitable for domestic drainage pipes, rainwater pipes, industrial waste water pipes and raindrop pipes in the interior of civil and industrial buildings that are newly built, expanded, and reconstructed and connected by clamps. Carbon steel pipe are used for conveying fluids and powder solids, exchanging heat energy, manufacturing mechanical parts and containers, and are an economical type of steel. The use of steel pipes to manufacture space trusses, columns and mechanical supports of building structures can reduce weight, save 20-40% of metal, and realize industrialized mechanized construction.

2. Different features, cast iron pipe have the advantages of safe and reliable operation, low damage rate, convenient construction and maintenance, and excellent anti-corrosion performance.

In addition, carbon steel pipe is a steel pipe welded by coils. Its processing is simple, but its life span is about 20-30 years, and the price is comparable to that of ductile cast iron pipes. Cast iron pipes are cast iron pipes cast by high-speed centrifuges. They are resistant to corrosion and pressure for more than 70 years. They are generally used as underground water and gas pipelines in cities.

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