1.Carbon seamless steel tube 2. Grade:10#,20#,16Mn, ASTM A106 Gr.B, ASTM ... , St42, St52, Q235 Best price,High quality Carbon seamless steel tube Place Of OriginChinaTypeseamless steel tubeSteel Grade10#, 20# 25# 45# Q195 Q235 Q345 ... rolled3. Hot rolled4. ERW5. SAW6. EFW7. LASWFace finished1. Manual polished2. mechanical polished3. black paint on the face4. anti-rust oil and ...