HOT DIP GALVANIZED STEEL PIPE TECHNICAL REQUIREMENTS

Pipe welding pipe, also known as pipe, is a steel plate or strip after the coil formed by welding made of steel. Welding steel pipe production process is simple, the production efficiency is high, the variety of specifications, equipment and less capital, but the general strength is lower than the seamless steel pipe. Since the thirties of the 20th century, with the rapid development of high quality cold rolling strip steel rolling production and progress of welding and inspection technology, continuously improve the quality of weld, welding steel pipe specifications are increasing and in more and more fields instead of the seamless steel pipe. According to the form of welded steel pipe weld is divided into longitudinal and spiral welded pipe.
Welded steel pipe is used as a steel plate or strip, because of its welding process is divided into furnace pipe, welding (resistance welding) pipe and automatic arc welded pipe. 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/T3091-2001 (galvanized welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, gas, air, oil and heating hot water or steam and other generally low pressure fluid and other use pipe. Its representative material is: Q235 grade a steel.
GB/T14291-2006 (mineral fluid transport welded steel pipe). Mainly used in mine air pressure, drainage, gas drainage shaft with a straight seam welded steel pipe. Its representative material B, Q235A grade steel. GB/T14980-1994 (large diameter welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, sewage, gas, air, heating steam and other low pressure fluid and other purposes. Its representative material Q235 grade a steel.
GB/T12770-2002 (stainless steel welded pipe for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotels and hotel decoration and other mechanical components and structural parts. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc..
GB/T12771-1991 (fluid transport with stainless steel welded pipe). Mainly used for conveying low pressure corrosive medium. Representative material for 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc..