ASTM A53 hot-rolled seamless steel pipe 1: Size:1/2-48" ... A53, DIN 3: ISO9001 ASTM A53 hot-rolled seamless steel pipe Specification Typehot-rolled seamless steel pipe ASTM A 53 ... medical equipment, boiler heat, exchanger, gas metallurgy, etc.Surface Hot galvanized, Cold galvanized, Painted black, varnish paint, anti rust ... the copy of B/L) ASTM A53 hot-rolled seamless steel pipe camy(at)hnssd(dot)com