Cast iron pipe vs Carbon steel pipe

Keywords: cast iron pipe, carbon steel pipe & tube, carbon steel pipe material and classification

Carbon steel pipes & tubes also called CS pipes, 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.

Carbon steel can be further divided into low carbon steel, medium carbon steel and high carbon steel, mainly depending on the carbon content in the steel. Due to its strength and ability to withstand pressure, carbon steel pipes are used in a variety of heavy industries such as infrastructure, ships, stills, and fertilizer equipment.

Carbon steel pipe

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.

Advantages of carbon steel pipes:

Carbon steel piping provides safety and durability. It is an ideal material for structural applications due to its impact resistance and its imperceptibility to harsh environmental conditions such as stress or extreme weather.
The incredible strength of carbon steel means that carbon steel pipes can be made thinner and use less material while still being able to transport large volumes. This makes carbon steel piping a cost-effective material. Not only can the use be reduced, but the carbon steel can also be recycled, which is environmentally friendly and economical.
Carbon steel pipe is a versatile material due to its ease of fabrication. We can produce products in various thicknesses and sizes. It's also easy to cut and bend to fit wherever needed. It also connects easily to fittings, valves and other plumbing fittings.

Types of carbon steel pipes:

Carbon steel pipes can be divided into seamless pipes and welded pipes (straight seam steel pipes, spiral pipes, high frequency welded steel pipes) according to the production method. Seamless steel pipes are made by hot rolling or cold drawing, and have high strength and tightness. Welded steel pipe is made by rolling steel plate or steel strip into a cylindrical shape, and then connecting the weld seams by resistance welding, submerged arc welding and other methods.

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.

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

Classification of carbon steel:

Mild steel (also known as light steel): 

The carbon content is usually between 0.04% and 0.30%. Low carbon steel has good ductility and toughness, can be processed hot and cold, and is easy to weld. Commonly used low carbon steels include Q195, Q215, Q235, etc.

Medium carbon steel: 

The carbon content is usually between 0.30% and 0.60%. Medium carbon steel has high strength and hardness, but low ductility and toughness. Commonly used medium carbon steels include 45# steel, 40Cr and so on.

High Carbon Steel: 

The carbon content is usually between 0.60% and 2.00%. High carbon steel has high strength and hardness, but low ductility and toughness, and poor weldability. Commonly used high carbon steels include 65Mn, T8, T10, etc.

Carbon steel pipes can be divided into seamless steel pipes and welded steel pipes according to the production method. Seamless steel pipes are made by hot rolling or cold drawing, and have high strength and tightness. Welded steel pipe is made by rolling steel plate or steel strip into a cylindrical shape, and then connecting the weld seams by resistance welding, submerged arc welding and other methods.

Application fields of carbon steel pipe:

Carbon steel pipe has good corrosion resistance, pressure bearing capacity and machinability, and is widely used in many fields.

1. Pipes for mechanical engineering. Such as airline structural tubes, automobile half shaft tubes, transmission shaft tubes, large tractor structural tubes for vehicles, tractor water cooler tubes, rectangular square tubes and rectangular tubes for agricultural locomotives, transformer tubes and rolling bearing tubes, etc.
2. Drilling pipes for petroleum geological environment. Such as: oil drilling pipes, oil drilling pipes (kelly and hexagonal drill pipes), drill jacks, oil pipelines, oil waterproof casings and various tee joints, geological environment drilling pipes (core pipes, waterproof casings, active drilling rods, drill jacks, hoops and pin connectors, etc.).
3. Chemical pipes. Such as: petroleum cracking pipes, pipes for heat exchangers and pipelines of chemical machinery and equipment, stainless steel acid-resistant pipes, air-conditioning pipes for organic fertilizers and pipes for transporting chemical plant materials, etc.
4. Tubes for pipelines. Such as: water, gas pipes, seamless pipes for compressed air pipes, oil pipelines, pipes for oil and gas main lines. Leading pipes for agricultural irrigation water and pipes for sprinkler irrigation equipment, etc.
5. Pipes for thermal equipment. Such as boiling water pipes and saturated steam pipes used in general heating furnaces, overheating pipes, large smoke pipes, small exhaust pipes, arch brick pipes and continuous high-temperature alloy steel pipes used in electric locomotive heating furnaces.
6. Managed by other departments. Such as: tubes for utensils (tubes for liquefied gas cylinders and general utensils), tubes for instruments and meters, tubes for watch cases, injection needles and tubes for medical machinery, etc.

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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