1863 Pipe is made in wrought iron with furnace lap-welded seams 1893 First 30 inch dia pipe made in lap-welded 1899 First large diameter seamless steel pipe in 20 inch is made, thickness at 5/8 inch 1917 11 mile pipeline is using electric metal arc welding 1919 API (American Petroleum Institute) is charted. China 200X50X8mm Rectangular Steel Pipe Use for Machine On Made-in-China Steel Tube manufacturer / supplier in China, offering 200X50X8mm Rectangular Steel Pipe Use for Machine Manufacturing, 5"X8" Galvanized Nail Plate, 5"X8" 16ga Nail Plates and so on. BS 7, GB 3091, ASTM A53, JIS G3444, DIN2444 . Normal dimension of steel pipe:
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