... /3.1BThird party inspection:SGS, BV, Lloyds etc.Quality Standard:GB/T3091 Welded steel pipe for low pressure liquid deliveryGB/T9711 Petroleum and ... use for Water, Gas, Air and SteamASTM A53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessDIN 2458 ... , 08F, 08, 08AL, 08F, 10F, 10, HG5, DF08 SPHC, M8 hot rolled q345 steel pipe