... E235, E255,E355, St37.4, St35 Phosphate coated hydraulic tube Phosphate coated hydraulic tube 1) Certificate: ISO9001:2008, ISO/TS16949:20092 ... Package: bundled and wrapped in plastic or as per your requirement8) Surface treatment: zinc coated/phosphated9) Application : for hydraulic ... Xingcheng special steel and Baosteel Corp, the whole tube processing is conducted rigidly according to ISO9001 quality ...