© American Petroleum Institute API Specification 5CT / ISO 11960:2001

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Contents Page

Foreword...........................................................................................................................................................................vi

Introduction ...................................................................................................................................................................... vii

1 Scope....................................................................................................................................................................12 Conformance ........................................................................................................................................................22.1 Normative references ...........................................................................................................................................22.2 Units of measurement...........................................................................................................................................22.3 Tables and figures ................................................................................................................................................2

3 Normative references ...........................................................................................................................................2

4 Terms, definitions, symbols and abbreviated terms.............................................................................................44.1 Terms and definitions ...........................................................................................................................................44.2 Symbols and abbreviated terms ...........................................................................................................................8

5 Information to be supplied by the purchaser ........................................................................................................95.1 Casing...................................................................................................................................................................95.2 Tubing .................................................................................................................................................................10

6 Process of manufacture......................................................................................................................................126.1 General ...............................................................................................................................................................126.2 Heat treatment ....................................................................................................................................................126.3 Straightening.......................................................................................................................................................136.4 Traceability..........................................................................................................................................................13

7 Material requirements .........................................................................................................................................147.1 Chemical composition.........................................................................................................................................147.2 Tensile properties ...............................................................................................................................................147.3 Charpy V-notch test properties — General requirements ..................................................................................157.4 Charpy V-notch (CVN) — Absorbed energy requirements for coupling stock, coupling blanks and couplings 167.5 Charpy V-notch — Absorbed energy requirements for pipe ..............................................................................177.6 Charpy V-notch test — Absorbed energy requirements for casing and tubing accessories .............................197.7 Hardness maxima...............................................................................................................................................207.8 Hardness variation — Grades C90, T95 and Q125 ...........................................................................................207.9 Process control — Grades C90, T95 and Q125.................................................................................................207.10 Hardenability — Minimum percentage martensite for quenched and tempered products.................................217.11 Grain size — Grades C90 and T95 ....................................................................................................................217.12 Surface condition — Grades L80 9Cr and L80 13Cr..........................................................................................217.13 Flattening — Electric-welded pipe ......................................................................................................................217.14 Sulfide stress corrosion cracking (SSCC) test — Grades C90 and T95............................................................21

8 Dimensions, masses, tolerances, pipe ends and defects ..................................................................................238.1 Labels and sizes .................................................................................................................................................238.2 Dimensions and masses.....................................................................................................................................238.3 Diameter .............................................................................................................................................................238.4 Wall thickness.....................................................................................................................................................248.5 Mass ...................................................................................................................................................................248.6 Length .................................................................................................................................................................248.7 Casing jointers ....................................................................................................................................................248.8 Height and trim of electric-weld flash..................................................................................................................248.9 Straightness........................................................................................................................................................258.10 Drift requirements ...............................................................................................................................................258.11 Tolerances on dimensions and masses .............................................................................................................268.12 Pipe ends ............................................................................................................................................................27

API Specification 5CT / ISO 11960:2001 © American Petroleum Institute

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8.13 Defects ...............................................................................................................................................................288.14 Coupling make-up and thread protection........................................................................................................... 29

9 Couplings............................................................................................................................................................299.1 General requirements......................................................................................................................................... 299.2 Alternative grades or heat treatments................................................................................................................ 299.3 Process of manufacture — Groups 1, 2 and 3................................................................................................... 309.4 Process of manufacture — Grade Q125............................................................................................................ 309.5 Mechanical properties ........................................................................................................................................309.6 Dimensions and tolerances................................................................................................................................319.7 Regular couplings...............................................................................................................................................319.8 Special-clearance couplings — Groups 1, 2 and 3............................................................................................ 319.9 Combination couplings.......................................................................................................................................319.10 Reducing couplings ............................................................................................................................................319.11 Seal-ring couplings.............................................................................................................................................319.12 Special-bevel couplings — Groups 1, 2 and 3................................................................................................... 329.13 Threading ...........................................................................................................................................................329.14 Surface inspection..............................................................................................................................................329.15 Measurement of imperfections...........................................................................................................................339.16 Repair and removal of imperfections and defects.............................................................................................. 339.17 Thread surface treatment — Grade Q125 ......................................................................................................... 339.18 Couplings and coupling blank protection — Grade Q125.................................................................................. 33

10 Inspection and testing ........................................................................................................................................3310.1 Test equipment...................................................................................................................................................3310.2 Lot definition for testing of mechanical properties.............................................................................................. 3410.3 Testing of chemical composition ........................................................................................................................ 3410.4 Tensile tests .......................................................................................................................................................3510.5 Flattening test.....................................................................................................................................................3710.6 Hardness test .....................................................................................................................................................3810.7 Impact test ..........................................................................................................................................................4110.8 Grain size determination — Grades C90 and T95............................................................................................. 4310.9 Hardenability — Grades C90 and T95............................................................................................................... 4310.10 Sulfide stress cracking test — Grades C90 and T95......................................................................................... 4310.11 Metallographic evaluation — EW Grades P110 and Q125................................................................................ 4310.12 Hydrostatic test...................................................................................................................................................4310.13 Dimensional testing ............................................................................................................................................4510.14 Visual inspection ................................................................................................................................................4710.15 Non-destructive examination (NDE)...................................................................................................................48

11 Marking...............................................................................................................................................................5311.1 General...............................................................................................................................................................5311.2 Stamp marking requirements .............................................................................................................................5411.3 Stencil marking requirements.............................................................................................................................5511.4 Color identification..............................................................................................................................................5511.5 Thread and end-finish marking — All groups..................................................................................................... 5611.6 Pipe-threader marking requirements — All groups............................................................................................ 56

12 Coating and protection .......................................................................................................................................5712.1 Coatings — All groups........................................................................................................................................5712.2 Thread protectors ...............................................................................................................................................57

13 Documents .........................................................................................................................................................5813.1 Electronic media — All groups ...........................................................................................................................5813.2 Certification — Groups 1, 2 and 3...................................................................................................................... 5813.3 Certification requirements — Grade Q125......................................................................................................... 5813.4 Retention of records ...........................................................................................................................................5814 Minimum facility requirements for various categories of manufacturer ............................................................. 5814.1 Pipe mill ..............................................................................................................................................................5814.2 Processor ...........................................................................................................................................................5914.3 Threader .............................................................................................................................................................5914.4 Coupling, pup-joint, and accessory manufacturer.............................................................................................. 59

© American Petroleum Institute API Specification 5CT / ISO 11960:2001

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Annex A (normative) Supplementary requirements .......................................................................................................60

Annex B (normative) Purchaser inspection ....................................................................................................................72

Annex C (normative) Tables in SI units ..........................................................................................................................73

Annex D (normative) Figures in SI (USC) units............................................................................................................136

Annex E (normative) Figures in SI (USC) units............................................................................................................158

Annex F (normative) Figures in SI (USC) units ............................................................................................................218

Annex G (normative) Figures in SI (USC) units ...........................................................................................................222

Bibliography ...................................................................................................................................................................235