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Resistance welded steel pipes black, hot dipped galvanized, square pipe, rectangular pipe, galvanized pipe Standdard: Bs 1387-1985, astm a53, astm a513, astm a252-98, jis g3444-2004 stk400/500, jis g3452-2004, en 10219, en 10255-1996, din 2440.
