API 5CT Casing and Tubing Supplier in India — OCTG

API 5CT is the American Petroleum Institute specification that covers seamless and welded steel casing and tubing used in oil and gas well drilling and completion operations. Casing is the structural pipe cemented in the wellbore to prevent collapse and isolate geological formations. Tubing is the smaller diameter pipe installed inside the casing through which oil or gas flows to the surface. The specification defines grades from H40 through Q125 with increasing yield strength, and covers requirements for chemical composition, mechanical properties, dimensions, threading, and testing. Creative Metal Industries supplies the most commonly used grades: J55, K55, N80, L80, and P110.

These grades differ primarily in minimum yield strength and heat treatment, which determines their suitability for different well depths and conditions. J55 and K55 have minimum yield strength of 55,000 psi and are used for shallow to intermediate depth surface casing. N80 has 80,000 psi minimum yield and is used for intermediate and production casing at greater depths. L80 also has 80,000 psi yield but has a maximum hardness limit of 23 HRC making it suitable for sour service (H2S environments) per NACE MR0175. P110 has 110,000 psi minimum yield for the deepest, highest-pressure wells. Grade selection depends on well depth, formation pressures, and presence of corrosive gases.

We supply API 5CT casing and tubing with standard API connections as well as premium connections. Standard API casing connections include STC (Short Thread and Coupling), LTC (Long Thread and Coupling), and BTC (Buttress Thread and Coupling). Standard tubing connections include NUE (Non-Upset End) and EUE (External Upset End). We also supply premium connections from manufacturers like Tenaris (Blue, Dopeless), Vallourec (VAM), and TPCF that provide superior gas-tight sealing and higher torque resistance for critical wells including HPHT (High Pressure High Temperature) and deviated wellbore applications.

Yes, Creative Metal Industries stocks API 5CT L80 Type 1 casing and tubing that fully complies with NACE MR0175/ISO 15156 for sour service applications. L80 is specifically designed for wells containing hydrogen sulfide (H2S) with a controlled maximum hardness of 23 HRC to resist sulfide stress cracking (SSC). We supply L80 with complete documentation including hardness survey reports, NACE compliance certificates, and full traceability. For extremely sour environments, we also offer C90 and T95 grades with even more stringent metallurgical controls. All sour service products come from approved mills with documented quality management systems.

Creative Metal Industries maintains ready stock of API 5CT casing in sizes from 4.5 inches (114.3mm) through 13.375 inches (339.7mm) in J55 and K55 grades with standard LTC/BTC connections. Popular production casing sizes of 5.5 inch, 7 inch, and 9.625 inch are stocked in N80 and L80 grades. Tubing is stocked from 2.375 inches (60.3mm) through 4.5 inches (114.3mm) in J55 and L80 grades with EUE connections. Standard lengths are Range 2 (7.62-9.14m) and Range 3 (11.58-13.72m). Non-standard sizes, premium connections, and higher grades like P110 are available on order with typical lead times of 6-10 weeks.

We source API 5CT OCTG products from globally recognized mills including Tenaris (Argentina/global), Vallourec (France/Brazil), TPCO and Baosteel (China), Jindal SAW (India), Maharashtra Seamless (India), and ISMT (India). All mills hold API Monogram license (API Q1 quality system) and are audited by major oil companies. For critical sour service wells, we recommend Tenaris or Vallourec products with their proprietary premium connections. For cost-effective surface casing applications, Indian and Chinese API-licensed mills offer excellent value with full API compliance. All products come with API monogram marking and complete material traceability.