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Seamless steel pipes can be used for transporting fluids (such as natural gas, oil, water, etc.), certain solid materials, and are also an economical steel material. Using steel pipes to make mesh frames, pillars, and mechanical supports for building structures can reduce costs.
Seamless steel pipes are made of high-quality carbon steel or alloy steel. The manufacturing processes of seamless steel pipes include cold drawing and hot rolling, while welded steel pipes are made by rolling steel plates or steel strips into a tubular shape and then welding. The dimensional accuracy of seamless steel pipes is usually higher, especially those that have undergone cold rolling or cold drawing. The dimensional accuracy of welded steel pipes mainly depends on the level of control in the forming and welding processes.
Seamless steel pipes are mainly used as pipelines for transporting fluids or structural components, primarily in the mechanical industry. Welded steel pipes are mainly used for the transportation of fluids and gases in the construction industry, such as water supply, gas, and compressed air for low-pressure fluids. Pressure pipelines generally use seamless steel pipes. Typically, the working pressure that welded steel pipes can withstand is below 20 kilograms, which is within a safe range. They are usually used for low-pressure fluids such as water supply, gas, and compressed air. Seamless pipes can withstand ultra-high pressure, and of course their wall thickness will increase accordingly, which needs to be designed according to the required pressure. They are commonly used in high-pressure oil pipes, boiler pipes, and other high-temperature high-pressure equipment. Structural seamless pipes are determined by design requirements. Several types of welded steel pipes have undergone seamless processing with annealing treatment on the weld seam, making their pressure range almost equivalent to seamless steel pipes and thus worth considering. Some welded steel pipes on the market are made into seamless steel pipes by drawing or rolling with a core after overall heating, with smaller specifications. These steel pipes are seamless only in appearance, but their nature is less ideal.
Seamless steel pipes are produced by cold drawing and hot drawing, generally used for medium pressures equal to or greater than 1.6MPa. Welded steel pipes are made by high-frequency welding after forming steel plates, suitable for medium pressures less than 1.6MPa. Seamless steel pipes are widely used in petroleum, chemical, electric power, boilers, aerospace, military, and other fields, particularly in high-temperature, high-pressure, and high-strength environments. Welded steel pipes are mainly used in civil fields such as construction, water supply, gas supply, and heating, as well as industrial fields that do not require high strength and pressure resistance.
