Lu quality steel welded pipe joint to find the number of first-class quality and low price Order Steel Union Steel Co., Ltd. Shandong Liaocheng franchise of large diameter thick-walled seamless steel pipe 20 #, 45 # small-diameter seamless steel pipe plant, welded steel, H section steel, channel steel, angle steel manufacturers, companies with thousands of tons of annual stock pipe resources, procurement inquiries for friends in the community. Tel :0635 -88,764,388,876,446 Mobile: 13406354485 13406354498 Contact: Wang Qiang Man 

 Also known as welded steel pipe, steel plate or strip is formed through the crimp is made of steel after welding. Welded steel pipe manufacturing process is simple, efficient, and more varieties of different specifications, equipment investment, but the general strength of less than seamless. 
 Since the 1930s, with high-quality strip steel rolling production and the rapid development of welding and inspection technology, continuously improving the quality of welds, welded steel pipe specifications increasing and more and more areas instead of non- pipe joints. 
 Seam welded steel pipe according to the form is divided into Longitudinal and spiral welded pipe. Longitudinal production process is simple, high efficiency, low cost, rapid development. Spiral welded pipe strength is generally higher than the Longitudinal, can narrow the larger diameter pipe billet production, you can also use the same width of the billet production of different pipe diameters. But with the same length of straight seam pipe compared to the weld length of 30 to 100%, and lower production rate. Therefore, the smaller diameter pipe actually use straight seam welded, large diameter spiral welded pipe is mostly used. 

 Standard pipe welded steel pipe 1. Low pressure liquid delivery pipe welding (gb/t3092-1993), also known as general pipe, commonly known as the clarinet. Is used for conveying water, gas, air, oil and the general low-pressure steam heating fluid and other uses welded steel pipe. 
 2 low-pressure fluid Galvanized welded steel pipe (gb/t3091-1993), also known as galvanized welded steel pipe, commonly known as white tube. Is used for conveying water, gas, air, oil and steam heating, warm water and other fluids, or other general purpose low-pressure hot-dip galvanized welding (welding or welding furnace) steel pipe. 

 United Steel Pipe Co., Ltd. Shandong Liaocheng standing resource material Standard: Structural pipe GB8162-1999, fluid pipe GB8163-1999, low and medium pressure boiler pipe GB3087-1999, high-pressure boiler pipe GB5310-1999, fertilizer tube GB6479-2000, oil cracking pipe GB9948-88, seamless square tube, stainless steel grades Daquan 022-81432852. Implementation of international GB8162-2008 (structural pipe), GB8163-2008 (fluid pipe), GB3087-2008 (low and medium pressure boiler pipe), GB5310-2008 (high-pressure boiler pipe), GB6479-2000 (fertilizer pipe), GB9948-2006 (petroleum cracking pipe) API SPEC 5 (line pipe) enterprise with thousands of tons of annual stock pipe resources, procurement inquiries for friends in the community.