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API 5CT J55/K55 N80/N80q/L80 LSAW Carbonsteel Pipe for Oil Well Casings1
Petroleum ProductsAPI 5CT J55 LSAW PipK55 API 5CT Custom Length LSAW Pipe
EZ Steel Industrial Co., Ltd.
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Product DescriptionCarbon Steel PipeSteel tubes are versatile and important products in the engineering and construction industries. Their unique material properties, manufacturing processes, and wide range of applications make them a crucial component.PackageReinforced plywood case bysted angle bar, Playwood cased Plastic bags packing, Condenser, heat exchanger tube packing, U-tube packed with wooden cases.Related steel gradesASTM A53/A53M, ASTM A106/A106M, ASTM A179/A179M, ASTM A192/A192M, ASTM A210/A210M, ASTM A333/A333M, ASTM A335/A335M, ASTM A500/A500M, ASTM A523/A523M, ASTM A135/A135MAPI 5L PSL1/PSL2, ISO 3183EN 10210, EN 10216, EN 10217, EN 10255JIS G3452, JIS G3454, JIS G3455, JIS G3456, JIS G3457GB/T 8162, GB/T 8163, GB/T 3087, GB/T 5310, GB/T 9711ASME B36.10M, ASME B36.19MTPITUV, SGS, BV, Lloyd's, etc.Payment:L/C at sight, L/C 180 days, T/T, D/P, OA, Western Union,SpecificationAPI 5CT J55/K55/N80/N80Q/L80 LSAW Carbon Steel Pipes are longitudinal submerged arc welded (LSAW) carbon steel pipes manufactured in accordance with API Specification 5CT, which governs casing and tubing for oil and gas well applications. These pipes are designed to withstand high pressure, corrosion, and mechanical stress in downhole and surface operations. The grades (J55, K55, N80, N80Q, L80) indicate different strength levels and properties, ensuring suitability for varying well conditions (e.g., depth, pressure, corrosivity). LSAW technology ensures high structural integrity with a single longitudinal weld, making them ideal for large-diameter, heavy-wall applications.Size- Outer Diameter (OD): Typically ranges from 4.5 inches (114.3 mm) to 20 inches (508 mm), with common sizes for oilfield casing/tubing.- Wall Thickness: Varies by grade and application, from 5.21 mm (0.205 inches) to over 25 mm (1 inch), with strict tolerances (e.g., ±0.76 mm) to ensure pressure resistance.- Length: Available in standard lengths such as R1 (4.88–6.71 m), R2 (6.71–8.53 m), and R3 (8.53–10.36 m), or custom lengths as per customer requirements. Pipes may have threaded ends (STC, LTC, BTC) or plain ends for welding.Testing- Mechanical Testing: Tensile strength (J55/K55: 379–552 MPa; N80: 552–758 MPa; L80: 552–758 MPa), yield strength, elongation (≥18% for most grades), and impact testing (Charpy V-notch at -10°C for K55/N80Q).- Hydrostatic Testing: 100% tested at 90% of specified minimum yield strength (SMYS) to detect leaks.- Nondestructive Testing (NDT): Ultrasonic testing (UT) for internal/external defects, magnetic particle inspection (MPI) for surface flaws, and visual inspection of welds.- Thread Testing: Gauging to ensure compatibility with API thread standards (e.g., API 5B) for leak-tight connections.CompositionPrimarily carbon steel with grade-specific alloying elements:- J55/K55: C (0.28–0.35%), Mn (1.20–1.60%), Si (0.10–0.35%), P (≤0.030%), S (≤0.030%); K55 has stricter impact toughness requirements than J55.- N80: C (0.30–0.40%), Mn (1.20–1.60%), Si (0.15–0.35%), Cr (0.40–0.60%), Mo (0.15–0.25%); N80Q (quench-and-tempered) has higher uniformity in hardness.- L80: C (0.25–0.35%), Mn (1.20–1.60%), Cr (1.00–1.30%), Mo (0.20–0.30%); enhanced resistance to sulfide stress cracking (SSC) for sour well environments.All grades have low sulfur and phosphorus to minimize brittleness.Application - Oil & Gas Exploration: Casing for wellbore stabilization, tubing for fluid extraction (oil, gas, water) in onshore and offshore wells.- High-Pressure Pipelines: Surface gathering lines and transmission pipelines for hydrocarbon transport.- Geothermal Wells: Handling high-temperature, corrosive fluids due to grade-specific resistance (e.g., L80 in sour conditions).- Mining: Piping for slurry transport and dewatering systems in harsh environments.- Surface Treatment: Anti-corrosion coatings (e.g., epoxy, galvanization) for external protection; internal coating (e.g., fusion-bonded epoxy) to reduce friction and corrosion.- Certifications: API 5CT monogram certification, ISO 9001, and compliance with regional standards (e.g., ASTM, EN) for global markets.- Quality Control: Traceability of raw materials (heat numbers), welding process validation, and third-party inspection (e.g., SGS, BV) for critical projects.- Packaging: Bundled with steel straps, wrapped in anti-rust paper, and loaded on wooden skids to prevent damage during transportation.Company Profile EZ STEEL INDUSTRIAL Co., Ltd, together with LONG-RUN METALS Co., Ltd, is the export division and window company of EZ STEEL GROUP, which was founded in 1996 and has been committed to the development and manufacturing of industrial tubes in the past 20 years. It is one of the largest steel tube manufacturing enterprise groups in China. CertificationsFAQ
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