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OCTG – Tubing and Casing Coupling

Product generic:
Casing and Tubing Coupling, Casing Coupling, Tubing Coupling
Application:
Used for connect two joints of tubing or casing
Specification:
Tubing Coupling: 1.9”~ 4-1/2″
Casing Coupling: 4-1/2”~ 20”
Standard & Grade:
API 5CT and 5B :PSL1/PSL2  J55,K55,N80-1,N80-Q,L80-1, L80-9Cr,L80-13Cr,C90, C95, P110, Q125
Thread:
NUE, EUE, STC, LTC, BTC, HYDRILL CS,TENARIS XC,VAM
Surface:
Anti-corrosion&water Based Paint,Color codes painted which indicates different steel grades

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  • ​Introduction
A Coupling is a short connector used to join two pieces of OCTG (casing or tubing) by threaded connections, ensuring sealing integrity and mechanical strength.
  • ​Main Functions  
Connection: Joins two pipes into a continuous string via threads.
Sealing: Prevents leakage of downhole fluids (e.g., gas, crude oil).
Load-bearing: Withstands tensile, compressive, and bending forces.
  • ​Tubing Standards 
API 5CT, API 5B(American Petroleum Institute)
ISO 11960 (International Organization for Standardization)
GB/T 19830 (Chinese National Standard)
  • ​Material & Performance 
H40, J55, K55 : Standard wells (low corrosion)
N80, L80, C90 : Medium-depth wells (moderate corrosion)
P110, Q125 : Deep/ultra-deep wells (high collapse resistance)
L80-13Cr : High CO₂/H₂S corrosive environments
  • ​Manufacturing Process ​
Hot Rolling ​
Cold Rolling ​
Threading: API standard (NUE, EUE, STC, LTC, BTC) or premium connections (Hydril CS，Tenaris XC)
  • Specifications
Trade Services
  1. Customized Solutions
    Based on industry experience and customer needs analysis, provide matching solution suggestions such as material selection (carbon steel/alloy steel/stainless steel), specification matching (wall thickness/pressure rating), and application scenario optimization (petroleum/chemical/nuclear power).
  2. Global Logistics
    Integrate the international logistics network (sea freight/air freight/land transportation), and provide a real-time cargo tracking system (GPS positioning + customs clearance progress).
  3. Inventory Optimization
    Based on industry data analysis, dynamically adjust inventory classification (material type/dimension/regional warehouse), implement Just-in-Time (JIT) supply chain management, and reduce the risk of slow sales.
  4. Compliance Certification
    Assist in providing international certification documents such as ISO, ASTM, API, etc., to ensure that products meet the access requirements of the target market.
  5. End-to-End Tracking
    Provide full life cycle services from order confirmation to after-sales support, and offer technical consultation for installation guidance throughout the whole process.
 
Processing Services
  1. Custom Cutting
    Support cutting by laser, plasma, sawing machine, and self-propelled cutting machine to meet different dimensional requirements (such as fixed length, multiple length), and provide bevel processing services.
  2. Forming
    Provide elbow bending, flaring, and necking processing.
  3. Surface Treatment
    Provide surface treatment methods such as pickling, phosphating, polishing, sandblasting, painting, coating, galvanizing, and buffing.
  4. Machining
    Provide threading, chamfering, and drilling processing.
 
Quality Inspection
      Provide third-party inspection reports (such as chemical composition analysis, mechanical properties, UT flaw detection) to ensure that products meet the standards.
Common standards for seamless carbon steel pipesCommon GradesApplication
ASTM A53Gr.A, Gr.BBlack and hot-dipped zinc-coated steel pipes welded and seamless
ASTM A106Gr.A, Gr.B, Gr.CSeamless carbon steel for high temperature service
ASTM SA179 SA179Seamless cold-drawn low-carbon steel heat exchanger and condenser tubes
ASTM SA192SA192Seamless carbon steel boiler tubes for high pressure
ASTM SA210Gr.A1Seamless Medium-carbon boiler and superheater tubes
ASTM A333Gr.1(-50℃), Gr.6(-45℃，C-Mn)seamless and welded carbon and alloy steel pipe intended for use at low temperatures.
ASTM SA519 1020Seamless carbon for mechanical tubing
API Spec 5CT H40, J55, K55, L80, N80-1, C95, P110, Q125Seamless steel pipe for casing
API Spec 5LPSL1/PSL2  Gr.a,Gr.b, X42/52/60/65/70/80Seamless steel pipe for line pipe
DIN 17175St35.8Seamless steel tube for elevated temperture
DIN 2391St35, St52Cold drawn seamless prevision pipe
DIN 1629St37.0, St44.0, St52.0Seamless circular unalloyed steel tubes subject to special requirements
GB/T 8162-201810, 20, 35, 45Structural Seamless Steel Pipes
GB/T 8163-201810, 20Fluid Transportation Seamless Steel Pipes
GB 3087-200810, 20, 20GMedium & Low-Pressure Boiler Pipes
GB 5310-201720MnG, 25MnGHigh-Pressure Boiler Pipes
GB 6479-201310, 20, 20GHigh-Pressure Fertilizer Equipment Seamless Pipes
GB 9948-201310, 20Petroleum Cracking Seamless Pipes
GB/T 9711-2017L245 (Gr.b), L290 (X42), L360 (X52), L415 (X60), L450 (X65), L485 (X70), L555 (X80)Oil & Gas Pipeline Pipes
GB/T 19830-2017H40, J55, K55, L80, N80, C95, P110, Q125Oil Casing & Tubing

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