... sizes of steel pipes, 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 ... ) Standards: GB/T3091-2001, BS1387-1985, ASTM A53, EN102193) Use: Used for low pressure liquids conveyance, such as water, gas, and construction4 ...