... Standard:GB /STM/ASME/JIS/DIN/EN.etc. round steel pipeO.D.:38mm-325mmW.T.:1mm-50mmStandard:GB /STM ... bundles or wooden cases or according the customersstainless steel tube: Grade: 304,304L,316,316L,316Ti,310s. ... 312stainless steel tube:Grade304, 304L, 316, 316L,316Ti, 310S, ... machinery, water supply, boiler heat exchangers etc. Stainless round steel pipe