Prime hdg steel pipes 1. Certificate:API 5L, ISO9001 2.Third party Inspection ... acceptable 3. USD 800,000,000 annual sales 1.Prime hdg steel pipes2. Steel grade:Q195-Q345B, S235JRH,S355JOH3. Outer Diameter: 21-610mm4 ... vessel9. Main Market: Middle East, South Asia, South America Prime hdg steel pipes