The processing technology is different: seamless steel pipes are made of high-quality carbon steel or alloy steel. The processing divided into cold drawing and hot rolling, and the seamed pipe is generally made by welding.
Different uses: Seamless steel pipes are mainly used as pipelines or structural parts for transporting fluids, mainly in the machinery industry, and seamed steel pipes are mainly used in the construction industry, such as low-pressure fluids such as water delivery, gas, and compressed air. But the pressure pipes involved are all seamless steel tubes.
The large use pressure that a seamed pipe can generally withstand is within 20 kg, which is a safe use range. It is generally used for low-pressure fluids such as water, gas, compressed air, etc.; seamless steel pipes can withstand ultra-high pressure, of course, its wall thickness will also increase, which needs to be designed according to pressure requirements. It is generally used for high-temperature and high-pressure equipment such as high-pressure oil pipes and boiler pipes. At present, there are some seamless pipes with seam steel pipes, which are annealed the weld seam, and the residual stress of the weld seam makes the weld seam equivalent to the base metal, and its pressure bearing range is basically equivalent to that of the seamless steel tube.