Classification and Application areas of Seamless Steel Pipes

Seamless steel pipes are made of a whole round steel perforated and have no welds on the surface. They are called seamless steel pipes. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, jacked pipes, etc.

Seamless steel pipe is a long strip of steel with a hollow section and no joints around it. The seamless steel pipe has a hollow cross-section and can be used as a pipeline for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, seamless steel pipe has the same bending and torsional strength and is lighter in weight. It is a kind of economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. The use of seamless steel pipe to manufacture ring parts can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, such as rolling bearing rings, jack sleeves, etc., widely used steel pipe to manufacture. Steel pipe is an indispensable material for all kinds of conventional weapons, and the barrel and barrel are made of steel pipe. Steel pipes can be divided into round pipes and special-shaped pipes according to the different shapes of the cross-sectional area. Since the circle area is the largest when the circumference is equal, more fluid can be transported with a circular tube. In addition, when the annular section is subjected to internal or external radial pressure, the force is more uniform, so the vast majority of steel pipes are round pipes. However, the round pipe also has certain limitations, such as under the condition of plane bending, the round pipe is not as strong as the square and rectangular pipe bending strength, and some agricultural machinery skeletons, steel and wood furniture are commonly used square and rectangular pipes. According to different uses also need to have other cross-section shape of the shaped steel pipe.

Production technology and application

There are many kinds of seamless steel pipe production processes, the current market common hot rolling method, pipe topping method, extrusion method, cold rolling method, cold drawing method, among which, hot rolling method and cold drawing are the two production processes with the highest frequency of use. Among them, the hot rolling process is mainly producing common fluid seamless steel pipes, with a market share of 65%; Products under the cold-drawing production process are mainly used for high-end precision seamless steel pipe products, with a market share of 15%; Other production methods accounted for 20% of the market.

Classification of seamless steel pipes

The production process of general seamless steel pipes can be divided into two types: cold rolling and hot rolling. In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally thicker than that of hot-rolled seamless steel pipes. But the surface looks brighter than thick-walled seamless steel pipes. The surface is not too rough, and the caliber does not have too many burrs.

Application areas of seamless steel pipes

In terms of downstream uses, seamless steel pipes are currently widely used in the downstream market, including seamless steel pipes for oil and gas drilling equipment, seamless steel pipes for general fluid transportation, and seamless steel pipes for heavy machinery equipment accessories.

Construction: Seamless steel pipes are an important material in the construction sector, especially in high-rise buildings and large structures. In construction, seamless steel pipes are used to bear the weight between floors and support frame structures. In addition, seamless steel pipes are also used for the installation of stage background frames and new energy equipment.

Oil and Gas: Seamless steel pipe is one of the most commonly used materials in the oil and gas industry. In the production, processing and transportation of oil and natural gas, seamless steel pipes can be used to withstand high pressure and temperature to ensure the safe operation of production lines.

Automotive and Machinery: Seamless steel pipes are widely used in the automotive and mechanical industries, especially for the manufacture of pipes for engines, driveshafts, suspension systems and braking systems.

Chemical industry: The chemical industry requires highly corrosion-resistant pipes, and seamless steel pipes can meet this requirement through surface treatment and material selection. They are commonly used for the transfer and storage of hazardous and corrosive chemicals.

Food and pharmaceutical: Seamless steel pipes are also used in the manufacture of food and pharmaceutical equipment, meeting high hygiene and structural requirements.

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