Steel pipes are long and hollow tubes that are used for� many different applications in a variety of places. Such as conveying fluids and powdery solids, exchanging heat, making machine parts and containers and so on. It is also an economical type of steel and� its versatility makes pipes the most often used product that is produced by the steel industry. Steel pipe production technology development began with the rise of the bicycle manufacturing, development of oil in the early years of the 19th century, two world war ships, boilers, aircraft manufacturing, after the second world war thermal power boiler manufacturing, chemical industry and the development of oil and gas drilling and transportation, effectively driving the steel pipe industry in the development of varieties, yield and quality. Steel pipe can be divided into two categories according to the production method: seamless steel pipe and seam steel pipe, seam steel pipe is divided into straight seam steel pipe and spiral seam welded pipe. Product name: steel pipe, structure steel pipe; Standard: ASTM, ASME and API; Grades: API 5L Gr. X42/X46/X52/X56/X60/X65/X70/X80and higher. PSL-1/PSL-2. ASTM A106 Gr. B/C. ASTM A53 Gr. B; Size: 1/2 inch to 12 inch, 14 inch, 16 inch, 18 inch, 20 inch, and 24 inch for seamless; Wall thickness: SCH 10, SCH 20, SCH 30, SCH 40, STD, XS, SCH 60, SCH 80, SCH 100, SCH120, SCH160, XXS; Length Range: 20 FT (6 meter), 40FT (12 meter)or customized; Ends Type: Beveled ends, Plain ends; End Protection: plastic Caps or iron Caps; Surface Coatings: Natural, Varnished, Black painting, 3PP, FBE and 3PE, Cladding and Lined etc.