1.Carbon seamless steel tube 2. Grade:10#,20#,16Mn, ASTM A106 Gr. ... A53, St37, St42, St52, Q235 Best price,High quality Carbon seamless steel tube Place Of OriginChinaTypeseamless steel tubeSteel Grade10#, 20# 25 ... Equipment Certification3. Quality Systerm Certificate4. API5. ISO6. Other certificatesProcess Method1. Cold Drawn2. cold rolled3. Hot rolled4. ERW5. SAW6. EFW7. LASWFace finished1. Manual ...