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Industries OverviewThe company's products are primarily used in industrial equipment sectors such as nuclear power, petroleum, petrochemicals, chemical engineering, power generation, automotive manufacturing, shipbuilding, fertilizer production, pharmaceuticals, papermaking, sugar refining, and machinery manufacturing. -
Products & SolutionsOur Products: Ferrous metal ore raw materials (nickel ore, ferronickel, ferrochrome, ferromanganese, ferrosilicon, etc.), seamless pipes, welded pipes, medium-thick plates, plate coils, bars, wire rods, wire coils, pipe fittings, flanges, castings, etc. -
CommunityThe company has established an excellent reputation within the industry through its strong credibility, comprehensive services, and ample resources. -
Process VisualizationThe company's products are primarily used in industrial equipment sectors such as nuclear power, petroleum, petrochemicals, chemical engineering, power generation, automotive, shipbuilding, fertilizer production, pharmaceuticals, papermaking, sugar refining, and machinery manufacturing. -
About UsTsisco Industrial Ltd. was established in 2010. Originating from the Tsingshan ecosystem’s Shanghai platform, the company now operates independently and focuses on global supply-chain integration, distribution, and import/export of steel and alloy materials. We achieved ISO 9001 certification from TÜV Rheinland in 2012, and ISO 9001, ISO 14001 and ISO 45001 certifications from LRQA in 2022. These accreditations underpin continuous improvement and stable performance in quality, environment, and occupational health & safety.
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Products & Solutions
OCTG | Oil Country Tubular Goods
OCTG | Oil Country Tubular Goods
OCTG (Oil Country Tubular Goods)｜Global Sourcing for Engineering & Procurement
1 | Product Positioning and Scope
OCTG covers casing, tubing, pup joints, coupling stock, couplings, and drill-stem accessories for oil and gas wells. It applies to conventional wells, tight/shale development, sour service (H₂S), CO₂ flooding and storage, offshore/deepwater, geothermal, and thermal/HPHT operations. Primary standards are API and ISO; equivalent national or company standards may be used if equivalence and deviations are stated in the order. Core references and current editions include API 5CT for casing and tubing (11th Edition), ISO 11960 (aligned with API 5CT), and ISO 13680 for CRA tubulars (latest 2024 edition). In China, the equivalent for casing and tubing is GB/T 19830. The official publications define scope and editions.
2 | Standards Matrix (by application)
— Casing and tubing: API 5CT or ISO 11960; including Product Specification Levels (PSL 1, PSL 2, PSL 3), dimensional series, grades, and end finishes.
— Threads and gauging: API 5B for threading, gauging, and inspection; common end finishes are STC, LTC, BTC and NUE/EUE for tubing; premium gas-tight connections as required.
— Performance calculations: API TR 5C3 for axial, internal/external pressure and collapse resistance calculations.
— Drill pipe (if included in the project): API 5DP or ISO 11961.
— CRA tubulars for casing/tubing: ISO 13680 or API 5CRA (duplex/super duplex and nickel-base alloys).
— Sour service compliance: NACE MR0175 (ISO 15156 series) for H₂S environments.
— China equivalence: GB/T 19830 for OCTG. Line pipe is GB/T 9711 (not OCTG).
3 | Scenario–Material–Standard–Size Mapping (quick text guide)
3.1 Conventional onshore wells (mildly corrosive media)
— Materials/grades: J55, K55, N80, L80 (Type 1).
— Connections: STC, LTC, BTC; NUE or EUE for tubing.
— Standards: API 5CT (or ISO 11960) + API 5B.
— Typical sizes: casing OD 5 in to 13⅜ in; tubing OD 2⅜ in to 3½ in; R2 length typical, R3 for deeper wells.
3.2 Sour gas wells (H₂S)
— Materials/grades: L80 (Type 1 with hardness control), C90, T95, P110 (controlled), plus 13Cr and Super 13Cr; for harsher media select 22Cr/25Cr duplex/super duplex or nickel alloys 825/625.
— Standards: API 5CT (or ISO 11960) + NACE MR0175 (ISO 15156) + ISO 13680 for CRA.
— Sizes/connections: premium gas-tight connections preferred; sizes per loads and corrosion allowance.
3.3 CO₂ EOR, storage and sequestration
— Materials: 13Cr, Super 13Cr, 22Cr/25Cr or Ni-base 825/625.
— Standards: API 5CT (or ISO 11960) + ISO 13680.
— Notes: control CO₂ corrosion and SCC; perform lab simulations where needed.
3.4 HPHT
— Materials/grades: P110, Q125, C110; specify high-collapse and thicker walls when required.
— Standards: API 5CT (or ISO 11960) + API TR 5C3 for design checks.
— Connections: premium gas-tight; consider multistage fracturing and thermal cycling.
3.5 Offshore and deepwater
— Materials: L80, P110, Q125 and CRA (22Cr/25Cr, 825, 625).
— Standards: API 5CT (or ISO 11960) + ISO 13680 for CRA, plus project specifications.
— Sizes: R3 lengths preferred; external and internal coatings per platform requirement.
3.6 Geothermal and thermal recovery (Huff-and-Puff, SAGD)
— Materials: L80 (Type 1), 13Cr, Super 13Cr, 25Cr or Ni-base depending on well temperature and chlorides; address thermal fatigue and collapse.
— Standards: API 5CT (or ISO 11960) + ISO 13680 for CRA.
4 | Size Range and Tolerances (per standards and contract)
— Casing OD: commonly ~4½ in to 20 in; larger OD for conductor pipes per project engineering.
— Tubing OD: ~1.050 in to 4½ in.
— Lengths: R1, R2, R3; R2 prevalent, R3 for deep/offshore.
— Tolerances and drift: OD, wall, mass, and end finish per API 5CT (or ISO 11960); drift per minimum or project-tightened values; thread gauging per API 5B.
5 | Manufacturing Process and Key Controls
— Routes: hot-worked seamless (piercing + rolling or extrusion) or welded routes meeting standard heat treatment and testing.
— Heat treatment: normalize, quench & temper, or solution/age (by grade/alloy), meeting strength, toughness, and hardness windows, including NACE limits.
— Ends and connections: STC, LTC, BTC, NUE, EUE or premium gas-tight; threading and gauging per API 5B.
— Performance validation: collapse, internal pressure, tension, impact (as needed), hardness, and SSC testing per standards and project; use API TR 5C3 for property calculations/checks.
6 | Quality Inspection and Documentation
— Chemistry, mechanicals, metallography and hardness; HIC/SSC as required by NACE/ISO 15156.
— NDE and hydro per API 5CT or ISO 11960; 100% visual and gauging for threads.
— Docs: EN 10204 3.1/3.2 MTC; heat-treatment charts; NDE and hydro records; thread gauging; NACE compliance statement for sour service.
7 | Supply Forms and Packaging
— Supply: couplings made-up, thread protectors, stenciling and rust-preventive coating, strapped and wrapped for transport.
— Options: external coatings (epoxy, 3LPE/3LPP), internal plastic coating (IPC), phosphating and dope pre-application.
8 | Ordering Checklist (ready to paste into RFQ/PO)
1. Standard and edition: e.g., “API 5CT 11th Edition” or “ISO 11960:2020.”
2. PSL level: PSL 1, PSL 2 or PSL 3 (if applicable).
3. Grade and service: e.g., “L80 Type 1 (general), T95 (sour), 13Cr/S13Cr (CO₂/chlorides), Q125 (HPHT).”
4. Ends and connections: STC, LTC, BTC, NUE, EUE or premium; drift requirement.
5. Size: OD × wall (or mass) × length level (R1/R2/R3).
6. Inspection and documents: NDE scope, hardness limit, SSC/HIC (if required), thread gauging, MTC 3.1/3.2, third-party witnessing.
7. Specials: high-collapse rating, upgraded couplings, IPC/external coating, traceability and shipping.
9 | Material Selection Guide (high-level)
— Cost-effective and mild media: J55/K55/N80 (API 5CT).
— Sour service: L80 (Type 1 with hardness control), C90/T95, or 13Cr/Super 13Cr; for severe sour/high chlorides use 22Cr/25Cr/Ni alloys (ISO 13680).
— CO₂ and saline environments: 13Cr/S13Cr baseline; move to 22Cr/25Cr or 825/625 as temperature and chlorides increase.
— HPHT: P110/Q125/C110; specify high-collapse where needed.
— Offshore/deepwater: R3 lengths, premium connections, and external/internal coating combinations.
10 | Procurement, Construction and O&M Risks
— Using line pipe (API 5L or GB/T 9711) in place of OCTG; wrong standard family.
— Missing NACE (ISO 15156) hardness/material controls for sour service.
— Stating only “API 5CT” without grade, PSL, end finish, and drift, leading to unusable deliveries.
— Ignoring collapse rating and temperature effects for HPHT.
— Mixed or noncompliant connections causing downhole leaks.
— Missing markings/traceability limiting compliance and liability control.
11 | Representative Spec Lines (ready to use)
— “Casing, API 5CT (11th Ed.), P110, 9⅝ in × 53.5 lb/ft (or 12.19 mm WT), BTC, R3, PSL 2; hydro and NDE per standard; 100% thread gauging; MTC 3.2 and drift records.”
— “Tubing, API 5CT, L80 Type 1 (sour limit), 2⅞ in × 6.5 lb/ft, EUE, R2, PSL 2; hardness and NACE compliance statement; MTC 3.1.”
— “Tubing (CRA), ISO 13680, 22Cr duplex, 3½ in × 7.0 mm WT, premium gas-tight connection, R2; project SSC/HIC program and lab evaluation; MTC 3.1 with third-party witnessing.”
12 | Representative Global Manufacturers (alphabetical, examples)
Tenaris; Vallourec; Nippon Steel (incl. former NSSMC); JFE Steel; Sumitomo; TMK; U. S. Steel Tubular; TPCO; Baowu-affiliated tubular companies; Hengyang Valin; ArcelorMittal Tubular (regional). Capabilities on grades, connections, and length supply vary by mill; use mill datasheets and contract for final confirmation.
OCTG (Oil Country Tubular Goods)｜Technical Specifications
1. Scope and application
• OCTG covers casing, tubing, drill pipe and accessories for drilling, completion and production in onshore/offshore, conventional/unconventional, HPHT, CO₂/H₂S, thermal and horizontal wells.
2. Standards and codes matrix
• Casing/tubing: API 5CT (PSL-1/PSL-2), ISO 11960.
• Threading/gauging: API 5B.
• Connection testing: ISO 13679 (CAL I/II/III/IV).
• Drill pipe: API 5DP; tool joints/gauging: API 7-1 / 7-2; DS-1 may be buyer-specified.
• CRA OCTG: ISO 13680 (13Cr/25Cr/6Mo/Ni-base).
• Thread compound/dope-free: API RP 5A3 / ISO 13678.
• Sour: ISO 15156 / NACE MR0175; tests TM0177/TM0284.
• China industry: SY/T 6194 (OCTG general), related SY/T for threading & gauging.
3. Product scope and connection types
• Casing: OD 4½″–20″; API STC/LTC/BTC or premium (metal-to-metal seal, torque shoulder; flush/semi-flush options).
• Tubing: OD 1.900″–4½″; API EUE 8-Rd/NUE 10-Rd or premium gas-tight.
• Drill pipe: 2⅜″–6⅝″ with friction-welded tool joints per API 7-1; optional internal coating/hardbanding.
• Accessories: couplings, pup joints, cross-overs, tail-pipe hangers, sand-control screens/liners.
4. Sizes, length ranges and drift
• Length: Range-1 ≈ 4.88–7.62 m, Range-2 ≈ 7.62–10.36 m, Range-3 ≈ 10.36–14.63 m.
• Drift: API Drift or Special Drift (state actual tool OD to pass).
• End protection: thread protectors and storage compounds per vendor instructions (dope-free where applicable).
5. Grades and material selection (casing/tubing, API 5CT)
• H40/J55/K55: shallow/moderate sweet wells.
• N80 (Type 1/Q): deeper/higher internal pressure; N80Q often preferred in CO₂ service.
• L80 (Type 1/9Cr/13Cr): CO₂ with moderate chlorides; L80-13Cr offers better CO₂ resistance; H₂S bounded by ISO 15156 domain.
• C90/T95: medium-to-severe H₂S; hardness limits and SSC control mandatory.
• P110/Q125: deep/HPHT; for H₂S, hardness limits and SSC assessment required.
• CRA (ISO 13680): 13Cr-80/95/110, 25Cr duplex, 6Mo, Ni-base (625/825/C-276) for strong CO₂/high Cl⁻, mixed acids or high-T zones.
• Note: “High-Collapse (HC)” is supplier process enhancement, not an API grade; require type-test/statistical evidence.
6. Service–material–standard quick mapping (engineering guide)
• Conventional sweet wells → N80Q / P110 with LTC/BTC; for horizontals/high dogleg use premium with ISO 13679 CAL III/IV.
• High CO₂ (>10 bar) / moderate Cl⁻ → L80-13Cr or 13Cr-80/95 + premium seal; if temperature/Cl⁻ rise or acids present, evaluate 25Cr/6Mo/Ni-base.
• H₂S (sour) → C90/T95 (strict hardness limit) or CRA; verify suitability per ISO 15156.
• HPHT → P110/Q125 + premium; check combined loads (Axial-Pi-Pe-Bending) and provide ISO 13679 evidence.
• Thermal (SAGD/steam) → materials with ductility/thermal-fatigue tolerance (low-SMYS steels or 13Cr) and premium connections qualified for thermal cycling.
• Sand-control/tool-intensive completion → Special Drift; state minimum drift and tool OD.
• Collapse control → calculate elastic/transition/plastic/yield collapse per API TR 5C3 / ISO 10400; HC option requires type test/statistical proof.
7. Manufacturing and heat treatment
• Pipe body: billet → piercing/rolling/extrusion → sizing → heat treatment (N/Q+T/SRA/solution) → straightening → NDE.
• Couplings/tool joints: forging → heat treatment → machining.
• Threading/surface: API 5B gauging; phosphate/copper-plate; premium per vendor process (seal protection, machining, compounds).
• Coatings/linings: IPC/epoxy/ceramic internal, preservative external.
• Drill pipe: friction-welded tool joints, PWHT and NDE per 5DP/7-1/7-2; internal coating and hardbanding options.
8. QA/QC and documentation
• General: chemistry, tensile/impact, hardness, metallography; UT/MT/ECT/RT as applicable; hydro/gas-tight; dimensions/drift; end protection; color bands.
• PSL-2: tougher limits on toughness/NDE/cleanness/hardness and documentation than PSL-1.
• Sour: SSC/HIC per ISO 15156 + TM0177/TM0284; hardness limits for BM/WM/HAZ.
• Connection: ISO 13679 CAL level and load envelope; define acceptance criteria.
• Gauges: API 5B/7-2 certificates; premium gas-seal pressure test and leak-rate criteria.
• Docs: EN 10204 3.1/3.2 MTC, NDE/hydro/gas-tight/SSC/HIC/connection test reports, gauge certs, HT records, full traceability.
9. RFQ/PO checklist (ready-to-use)
10. Well profile & fluids: depth, casing program, design P/T, pH₂S, pCO₂, Cl⁻, water, HPHT/thermal, max tool OD/drift.
11. Sizes & length: OD × weight (lb/ft) or wall, R1/R2/R3, API or Special Drift.
12. Standards: API 5CT (PSL-1/PSL-2), API 5B; drill pipe to API 5DP/7-1; connection to ISO 13679 (state CAL).
13. Grades: J55/K55/N80 (T1/Q)/L80 (T1/9Cr/13Cr)/C90/T95/P110/Q125 or ISO 13680 CRA; for sour, declare ISO 15156 domain and hardness limits.
14. Connections: STC/LTC/BTC/EUE/NUE or premium (metal seal/shoulder/flush); dope-free option and approved compounds.
15. Inspection & docs: 3rd-party, MTC 3.1/3.2, NDE scope, gas-tight/hydro, SSC/HIC, gauge certs, connection type-test.
16. Surface/packing: protectors, phosphate/copper-plate, end-caps, seaworthy packing, barcode/QR traceability.
17. Options: internal/external coating, high-collapse variant, accessories (pups/x-overs/hangers/screens).
18. Field risks and controls
• Torque-turn control; no over-/under-make; defined back-out/re-inspection for cross-thread/galling.
• Clean/dry threads; compounds per API 5A3/ISO 13678; dope-free per vendor chemicals.
• Tool OD vs drift; avoid damage from tight spots.
• Running: proper elevators/slips; control impacts and eccentric loads at wellhead.
• Corrosion management: inhibitors/wax control; thermal cycling seal retention for steam wells.
• Traceability: per-joint IDs, torque curves, running order and depth.
11. “No-go” list
• Using GB/T 9711 line pipe as OCTG purchase basis.
• Sour service without SSC/HIC and hardness control.
• API round threads used where gas-tight/high-dogleg premium is required.
• “PSL-1 + ad-hoc tests” replacing required PSL-2 + ISO 13679.
• Buying “HC” without type-test/statistical evidence.
12. Global clusters and indicative producers (alphabetical; verify approvals)
• Europe: Vallourec (FR/BR/US), Tenaris Europe (IT/RO), EUROPIPE (DE, limited OCTG), Benteler (DE, some OCTG), Interpipe (UA).
• North America: Tenaris (US/MX/AR), U.S. Steel Tubular, Vallourec Star (US), Evraz NA (CA/US), Berg (limited OCTG).
• Japan: Nippon Steel, JFE Steel.
• Korea: POSCO, Hyundai Steel.
• China: TPCO, Baosteel/Baowu, Hengyang Valin, Shandong Molong, Weihai (WSP), Hilong (drill pipe/coating), DP-Master (drill pipe).
• India: Maharashtra Seamless, ISMT, Jindal.
• Middle East: Tenaris Saudi (ex-SSP), Arabian Pipes (partial).
• Note: premium connections are proprietary; license and compatibility to be locked in the RFQ.
13. Example spec lines
• Sweet, medium-depth casing:
“API 5CT PSL-2 P110 BTC, OD 9⅝″ × 47.0 lb/ft, Range-3, API Drift; same-grade couplings; phosphate; hydro/gas-tight passed; MTC 3.2 and API 5B gauge certs.”
• CO₂-rich interval (gas-tight):
“API 5CT PSL-2 L80-13Cr, OD 7″ × 29.0 lb/ft, premium metal-seal (ISO 13679 CAL III evidence), Range-2, Special Drift 5.875″; ISO 15156 compliance; dope-free; MTC 3.2.”
• H₂S tubing:
“API 5CT PSL-2 T95, OD 3½″ × 9.3 lb/ft, EUE 8-Rd, Range-2; hardness within ISO 15156; SSC (TM0177) + HIC (TM0284) passed; MTC 3.2.”
• HPHT/horizontal:
“API 5CT PSL-2 Q125, OD 5½″ × 23.0 lb/ft, premium metal-seal + torque shoulder, Range-3; ISO 13679 CAL IV; torque-turn window specified; cyclic gas-seal test passed; MTC 3.2.”
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