Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip after coiling and forming. Welded steel pipe has the advantages of simple consumption process, high consumption efficiency, many kinds and specifications and less equipment, but its ordinary strength is lower than seamless steel pipe. Since the 1930s, with the rapid development of consumption of high-quality strip continuous rolling and the progress of welding and inspection technology, the quality of weld seams has improved from time to time, and the types and specifications of welded steel pipes have increased day by day, and seamless steel pipes have been replaced in more and more fields. Welded steel pipe is divided into straight welded pipe and spiral welded pipe according to the way of weld.
The billet used in welded steel pipe is steel plate or strip. It is divided into furnace welded pipe, electric welded pipe and automatic arc welded pipe because of different welding technology. Because of its different welding methods, it can be divided into straight welded pipe and spiral welded pipe. Because of its end shape, it can be divided into circular welded pipe and special-shaped (square, flat, etc.) welded pipe. Welded pipes are classified into the following categories because of their different materials and uses:
GB/T3091-1993 (Galvanized Welded Steel Pipe for Low Pressure Fluid Delivery). Mainly used for conveying water, gas, air, oil, heating hot water or steam and other common low pressure fluids and other useful pipes. Its representative material is grade Q235A steel.
GB/T3092-1993 (Galvanized Welded Steel Pipe for Low Pressure Fluid Delivery). Mainly used for conveying water, gas, air, oil, heating hot water or steam and other common low pressure fluids and other useful pipes. Its representative material is Q235A grade steel.
GB/T 14291-1992 (Welded Pipe for Mine Fluid Delivery). Mainly used for mine air pressure, drainage, shaft gas drainage with straight seam welded steel pipe. Its representative material is grade Q235A and B steel. GB/T 14980-1994 (Large Diameter Welded Steel Pipe for Low Pressure Fluid Delivery). Mainly used for low pressure fluids such as water, sewage, gas, air, heating steam and other uses. Its representative material is grade Q235A steel.
GB/T12770-1991 (stainless steel welded steel pipe for mechanical construction). Mainly used in machinery, automobiles, bicycles, furniture, Hotel and hotel decoration and other mechanical parts and structures. Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
GB/T12771-1991 (stainless steel welded pipe for fluid delivery). Mainly used to deliver low-pressure corrosive media. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Longitudinal welded pipe has the advantages of simple consumption process, high consumption efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can use narrow blank to consume welded pipe with larger diameter, and the same width blank to consume welded pipe with different diameter. However, compared with the straight seam pipe of the same length, the length of the weld increases by 30-100%, and the consumption rate is lower.
The wonderful content of this article is provided by Jinan galvanized pipe. There are many wonderful contents on this website. You can click on more content to enter: http://www.jnxjm.com. We have a special customer service to answer your questions.