... , including spiral steel pipe, hot dip galvanized steel pipe , large diameter galvanized welded steel pipe ,electric galvanized pipe, pre-galvanized pipe, square and rectangular steel pipe, welded steel pipe, ERW pipe, etc. These ... fields, growing with more than 5,000 customers together. Specification:1) Material: Q215, Q235, Q1952) Standards: GB/T3091-2001, BS1387-1985, ASTM ...