Committee Scope

Subcommittee 5, Tubular Goods (SC5)                        

API Staff Contact: Ben Coco (


SC5 develops, approves, and maintains standards pertaining and related to the product design and manufacture of:

  • casing/tubing and accessories for well operations
  • line pipe for transmission and facility piping
  • drill pipe and drill stem elements for drilling operations
  • pipe threading and gauging and thread compounds

The standards under SC5 are also supported with additional resources having expertise in metallurgy, performance properties, sour service, and coiled pipe

SC5 Advisory/Resource/Task Groups

  • Advisory Groups
    • Manufacturer (MAG)
    • User (UAG)
  • Resource Groups
    • Non-destructive Testing (RGNDT)
    • Performance Properties (RGPP)
    • Sour Service Products (RGSSP)
    • Coiled Tubulars (RGCT)
    • Monogram Program (RGMP)
  • Task Groups
    • Oil Country Tubular Goods (TGOCTG)​
    • Line Pipe (TGLP)
    • Drill Stem Elements (TGDSE)
    • Threading, Gauging, and Compounds (TGTGC)
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Ballot Information
NameTR 5NCL, WI 2401, Ni-Content Limits for API 5CT Sour Service Products
Start Date07/09/2021
Closing Date08/20/2021
AssociateBenjamin Coco
CoordinatorBenjamin Coco
ProposalThis TR will summarize the testing and provide information respective to the update in API 5CT regarding the allowable Nickel content-limit to make its Q125 grade products consistent with current knowledge regarding Sulfide Stress Cracking (SSC). Manufacturers are increasing their interest with higher Ni-content grades (e.g. P110). For example, although P110 is not a “sour grade”, its use above 175°F in a sour environment is allowed by NACE MR0175. There is a potential performance impact for such applications, where cracking mechanisms (such as SSC) can cause premature failures which could then lead to leaks and possible well control situations. For HPHT applications, the use of commercial nickel-containing grades (such as UNS G43XX for heavy section components with >80 ksi minimum yield strength) must meet the hardenability and toughness requirements that some non-nickel containing low-alloy steels (LAS) would not. Also, qualifying high-strength and high-toughness LAS with nickel contents above current limits for sour service will be a technology enabler when developing H2S containing reservoirs. The information this TR will provide would encourage investigating the Ni-effects on cracking behavior in other pipe grades and expand the selection of products available for operating in a harsh environments.
ResultsIn Progress

Ballot Summary
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Total Responses0 
Total Ballots0 
Response Rate0.00%Must be > 50%
Approval Rate0.00%Must be >= 66.67%
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