With annual output of 10 million tons, Yuantai Derun is the largest ERW square pipe, rectangular pipe, hollow pipe, galvanized pipe, and spiral welded pipe manufacturer in China. Annual sales reached $5 billion. Yuantai Derun has 59 black ERW pipe production lines, 10 galvanized pipe production lines，3 spiral welded pipe production lines，1 JCOE LSAW steel pipe production line. Square pipe 10 * 10 * 0.5mm to 1000 * 1000 * 60MM, rectangular steel pipe 10 * 15 * 0.5mm to 800 * 1100 * 60MM, spiral pipe Ø 219-1420mm can be made of yield strength from Q (s) 195 MPa to Q (s) 690 MPa.Yuantai Derun can produce square rectangular tubes according to ASTM A500/A501,JIS G3466,EN10219,EN10210,BV,DIN2240 and AS1163,GB/T9711,GB/T3091,GB/T3094,GB/T6728 etc,