What is welded steel pipe used to do? Welded steel pipe is a steel strip or steel plate bending deformation is round, square shape and then welded into the surface of the steel pipe. The blank of the welded steel pipe is made of steel or steel. Welded steel pipe, also known as welded pipe, steel pipe is welded with steel plate or strip after forming. The production process is simple, the production efficiency is high, the variety specification is high, the equipment capital is little, but the general strength is lower than that of seamless steel tube. Since 1930s, along with the rapid development of high quality strip mill and the progress of welding and inspection technology, the quality of the welding seam has been improved, the varieties of welded steel pipe are increasing. According to the form of welded steel pipe weld is divided into longitudinal and spiral welded pipe.

The blank of the welded steel pipe is a steel plate or strip, which is divided into the furnace pipe, the electric welding (resistance welding) and the automatic arc welded pipe because of the different welding process. Because of the different forms of welding longitudinal and spiral welded into two. Because of its end shape is divided into circular welded pipe and shaped (square, flat, etc.) welded pipe. Welded pipe is divided into the following several varieties because of its material and use:

GB/T3091-1993 (galvanized welded steel pipe for low pressure liquid delivery). Mainly used for conveying water, gas, air, oil and heating water or steam, and other general lower pressure fluid and other purposes. Its representative material Q235 grade a steel.

GB/T3092-1993 (galvanized welded steel pipe for low pressure liquid delivery). Mainly used for conveying water, gas, air, oil and heating water or steam, and other general lower pressure fluid and other purposes. The representative material is: Q235 grade a steel.

GB/T14291-1992 (mine fluid conveying pipe). Mainly used for mine pressure