... such as sucker rod, drill collar, drill pipe and oil tube, etc. It has over 300 professional ... company has been awarded ISO9001 Quality System Certification and authorized to use API Monogram issued by American ... 0552 , drill pipe 5D-0104,oil tube 5CT-0967. Our products and producing ability as follows:1, ... oil pipe 40,000 tons/year5. drill pipe tool joint 100,000 set/year API 5DP drill pipe for oil field ...