... B16.9, API 5L, ASTM A106/A53, DIN 3: ISO9001 ASTM A53 hot-rolled seamless steel pipe Specification Typehot-rolled seamless steel pipe ASTM A 53 Pipe Size1 ... , medical equipment, boiler heat, exchanger, gas metallurgy, etc.Surface Hot galvanized, Cold galvanized, Painted black, varnish paint, anti rust oil, 3PE, or as ...