... ,ASTM,API5L2.1-110mm,10.3-508mmUsed in oil & gas fieldsWelded Steel Pipe10#,20#,45#,Q195,Q215,Q235,Q345,etcGB,ASTM20-426mm ... ,0.5-10mmMainly used in petroluem,natrual gas and heating ... interested in the above products, you can fell free to contact us directly. We will quote you our most favorable price. High Quality ...