Hot Expanded Seamless Steel Pipes for Oil & Gas Transmission

Large-Diameter Hot-Expanded Seamless Steel Pipes Manufacturer & Stockist

PETROL STEEL CO., LTD. is a leading manufacturer, stockist, and global exporter of large-diameter hot-expanded seamless steel pipes, heavy-wall seamless steel pipes, high-pressure pipe fittings, and flanges based in China.

With over two decades of manufacturing excellence and international trade experience, we provide certified pipeline solutions for energy, infrastructure, petrochemical, and industrial projects worldwide.

Monthly Output: 50,000 Tonnes/Month
Hot Expansion Lines: 5 sets of advanced hot-expanding machinery
Processing Equipment: Industrial straightening machines & automated annealing heat-treatment equipment
Testing Facilities: Spectral analysis, Hydrostatic, Ultrasonic testing (UT), Eddy Current testing (ET), and Intergranular corrosion inspection
Traceability & Certification: 100% heat-number traceability with EN 10204 3.1 / 3.2 Material Test Certificates (MTC)

Parameter	Specifications
Outer Diameter (OD)	NPS 2″ to 48″ (323.9 mm – 1,200 mm)
Wall Thickness (WT)	SCH 10 to SCH 160 / STD, XS, XXS (8 mm – 60 mm)
Length (L)	1 – 12 Metres (Single Random, Double Random, Fixed Length)
Manufacturing Standards	API 5L, API 5CT, ASTM A106, ASTM A53, ASTM A335, ASTM A333, ASTM A519, SAE 4340, SAE 4140, SAE 1045, ASME B36.10, DIN 2448, EN 10216, GOST 8731, GOST 8732, JIS
Material Grades	Carbon Steel: ASTM A106 Gr.B, A53 Gr.B, API 5L Gr.B to X70 (X42, X52, X60, X65, X70)Alloy Steel: ASTM A335 (P11, P22, P91)Stainless & Duplex Steel: 304/304L, 316/316L, 2205 Duplex, CRA Clad PipesOCTG: API 5CT Casing & Tubing
Protective Coatings	3PE (Three-Layer Polyethylene), 3PP, FBE (Fusion Bonded Epoxy), Anti-rust oil, Black painting, Galvanized
Service Conditions	Standard Service, Sour Service Resistance (NACE MR0175 / ISO 15156), High-Temperature & High-Pressure (HPHT) endurance
Testing & Inspection	Hydrostatic, Ultrasonic (UT), Eddy Current (ET), Magnetic Particle (MPI), Intergranular Corrosion, Third-party inspection (SGS, BV, TUV, Lloyd’s)
Packing	Beveled/Plain ends with plastic caps, hex bundles, wooden crates, or seaworthy export bulk packing

Our large-diameter hot-expanded seamless pipes are engineered for demanding operational environments:

Oil & Gas Transport: Long-distance onshore & offshore transmission pipelines (oleoductos, gasoductos).
Refining & Petrochemicals: High-temperature processing units, chemical fertilizer plants, and crack furnace piping.
Power Generation: Thermal and nuclear power plant steam lines, boiler piping (P11, P22, P91).
Water & Municipal Infrastructure: Water transmission mains, aqueducts (acueductos), drainage, and sewage (alcantarillado).
Marine & Offshore Construction: Shipbuilding structural pipes, pipe piling, offshore platforms, and marine structures.
Mining & Heavy Industry: Wear-resistant slurry lines, pneumatic conveying systems, and heavy-duty structural piping.

PETROL STEEL CO., LTD. has supplied steel pipes to over 350 international projects with zero major claims.

Middle East & North Africa: UAE, Saudi Arabia, Kuwait, Oman, Iraq, Algeria, and Egypt (compliant with sour service standards and local approvals such as SASO).
West & East Africa: Nigeria, Kenya, Tanzania (specialized CIF delivery to Lagos, Mombasa, Dar es Salaam).
Southeast Asia: Indonesia, Vietnam, Thailand, Malaysia (consolidated shipping and project logistics).
Clearance & Verification Compliance: Full assistance with SASO, COC, SGS, and international pre-shipment documentation.

How is the quality of hot-expanded seamless steel pipes ensured?

Quality is maintained through standard raw materials (seamless mother tubes), precise medium-frequency induction heating controls, post-expansion sizing and straightening, strict heat treatment (normalizing/tempering), and 100% non-destructive testing (UT, Hydrostatic, ET) compliant with API 5L and ASTM specifications.