... BV.QC certificate Quick Details Standard: BS, JIS, GB, DIN, ASTM, APIStandard: BS 1387, BS 1139, BS 6363, JIS C8305-... ... 6 - 15 mmSection Shape: SquareOuter Diameter: 10*10-500*500Place of Origin: Tianjin China (Mainland)Secondary Or Not: Non-secondaryApplication: ... Q345, St33, St37-2, SS330, SS400, ASTM A 106B, ASTM A53, X42Quality:Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS, GB and SY ...