... '' to 24'' 2) Standard:APL 5L,API 5CT,ASTM A106,ASTM A53,EN CARBON STEEL SEAMLESS PIPES:CERTIFICATION:ABS .DNV.CCS.KR.BV ... 52 , ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API 5L and etc.5) Surface of Steel Pipe oiled or black ... , ship, structure pipe, automobile, shock absorber, building, geology, fluid tubes, line pipe etc4Mill CertificateMill Test Certificate will provide 5Length 5.8m ...