No.Product NameOD x WTSTANDARD1Seamless steel tubes and pipes for tubing48.26-114.30x4.83-12.70API SPEC 5CT2Seamless steel tubes and pipes for coupling stock of tubing57-142x8.5-16API SPEC5CT3Seamless steel pipes for casing114.30-219.08x5.21-22.22API SPEC 5CT4Seamless steel pipes for coupling stock of casing127-194x12.5-16API SPEC 5CT5Seamless steel tubes for heat insulating tubing73.0-127x5.51-12.70API SPEC 5CT6Seamless steel tubes for perforating gun oil and gas well88.9-127x6.45-12.70APISPEC 5CT7Seamless steel tubes for drill pipe60.3-168.3x6.45-12.70API SPEC 5D8Seamless steel pipes for coupling stock of line pipe10.3-219.1x1.7-20.6API SPEC5L9Seamless steel pipes for line pipe14.3-187.7x2-16API SPEC 5L10Seamless steel tubes for low and medium pressure boiler10-219x2.0-40GB3087-199911Seamless steel tubes and pipes for high pressure boiler10-219x1.5-40GB5310-199512Seamless steel tubes and pipes for structural purpose10-219x1.0-40GB\T8162-199913Seamless steel tubes and pipes for liquid service10-219x1.0-40GB\T8163-199914Seamless steel tubes and pipes for petroleum cracking10-219x1.0-16GB9984-198815Seamless hot rolled steel tubes for hydraulic pillar service68-219x6.0-32GB\T17396-199816Seamless steel tubes for high pressure chemical fertilizer equipment 14-219x1.0-40GB6479-200017The external thread pipes for low and medium pressure boiler25-76x1.5-40Q\12YB3029-200318Seamless steel tubes for automotive axle housing76-121x7.0-28.5YB\T5035-199619Carbon and carbon-manganese steel seamless tubes and pipe for ship10-219x1.5-40GB\T5312-1999 producing area:China