seamless steel tubes and pipes for high pressure boiler OD:1/4"--12" WT:SCH5S--XXS Certificate:PED/KR/DNV/ASME/BV/LLOYD Seamless steel tubes and pipes for high pressure bolier1.OD:38mm-325mm2.WT:4.5mm-45mm3.standard:GB3087,GB5310 ASME SA-106 ASME SA-192M, ASME SA-209M, ASME SA-210M, ASME SA-213M , ASME SA-335M DIN17175 JIS G34614.Application for the manufacturing of the bolier ,and steam