Steel Pipe — Seamless, Welded & Structural Solutions

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Steel pipes form the vital arteries of modern infrastructure and industry. Whether conveying high-pressure fluids across continents, extracting oil from deep wells, or providing the structural framework for skyscrapers, the integrity of the pipe is paramount.

At Luyuan Steel, we offer a comprehensive portfolio of tubular products to meet diverse industrial needs. Our range covers everything from standard ERW welded pipes for plumbing and construction, to high-grade seamless pipes for pressure vessels, specialized API tubulars for the oil and gas sector, and SHS/RHS hollow sections for architectural framing. All products are manufactured to strict international standards (ASTM, API, EN, JIS) ensuring reliability and safety.

API 5CT/5B steel pipe

API OCTG steel pipe with P110 grade, 114.3–508 mm outer diameter, K55/J55/N80/L80/P110 material options, and plain, beveled, or threaded ends for project supply.

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API 5L steel pipe

API 5L steel pipe with ASTM A106 GRB grade, 6 m / 12 m length options, shop primer and shot blasting surface condition, and processing support for project pipe supply.

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Seamless Pipe

Carbon steel seamless pipe with ASTM A106, ASTM A53, and API 5L model options, 10–700 mm outer diameter, 6–12 m customizable length, and processing support for industrial and project supply.

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SHS/RHS steel pipe

Galvanized SHS/RHS steel pipe with Q235/Q355 grades, ERW technique, 6 m / 12 m length options, and cutting support for frames, structures, and construction supply.

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Welded Pipe

Galvanized welded steel pipe with Q235B/Q355B grades, ERW/EFW technique, 6 m length, and processing support for punching, bending, and project supply.

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Steel Pipe — Technical Specifications

Parameter	Specification
Product Categories	Welded Pipe / Seamless Pipe / API 5CT / API 5L / SHS RHS
Outer Diameter (OD)	1/2″ to 48″ (10 mm – 1,200 mm) API Casing: 2-7/8″ to 13-3/8″
Wall Thickness (WT)	SCH 10 to SCH 160, XXS (Approx. 1.0 mm to 50 mm)
Length	6 m, 12 m, or Customized cut-to-length
Structural / General Grades	Q235, Q345, SS400, ASTM A53 Gr.A/B, ASTM A106 Gr.B
API Line Pipe Grades	API 5L Gr.B, X42, X52, X60, X65, X70
API OCTG Grades	API 5CT J55, K55, N80, L80, P110
Surface Finish	Bare (Black) / Lightly Oiled / Galvanized (GI) / 3PE / Shop Primer
End Finish	Plain End (PE) / Beveled End (BE) / Threaded & Coupled (T&C)
Standard	ASTM A53 / ASTM A106 / API 5L / API 5CT / EN 10219 / EN 10210

Why Source Steel Pipes from Luyuan?

Comprehensive Tubular Portfolio

We are a single-source supplier for all your piping needs. From structural square tubes (SHS) to high-pressure seamless pipes and specialized API casing, we consolidate your procurement process, saving you time and logistics costs.
API Certified Quality

For the critical oil and gas sector, our API 5L line pipes and API 5CT OCTG products are manufactured under strict API Q1 quality management systems. This ensures absolute reliability in high-pressure, high-temperature (HPHT) environments.
Advanced Anti-Corrosion

To maximize the lifespan of your pipelines, we offer advanced surface treatments including Hot-Dip Galvanizing for structural pipes, and 3PE (Three-Layer Polyethylene) or FBE (Fusion Bonded Epoxy) coatings for buried or submerged line pipes.
Precision End Preparation

Pipes must be ready for installation upon arrival. We provide precise end-machining services, including standard beveling (BE) for welding, and precision threading and coupling (T&C) for API casing and plumbing applications.
Rigorous Non-Destructive Testing (NDT)

Safety is our priority. Our pipes undergo extensive testing, including Hydrostatic testing for pressure containment, and Non-Destructive Testing (Ultrasonic or Eddy Current) to detect any hidden weld or material defects.

Custom Pipe Processing Services

We deliver pipes that are ready for immediate integration into your project. Our processing capabilities include:

Cut-to-Length	Precision band saw cutting to your exact specified lengths
Galvanizing	Hot-dip galvanizing for superior rust protection on structural and fluid pipes
Coating & Lining	3PE, FBE, epoxy lining, and color-coded painting for pipeline identification
Threading & Grooving	Standard NPT/BSPT threading and roll grooving for fire protection systems
Fabrication	Welding flanges, brackets, or custom attachments to pipe sections

Send us your piping isometric drawings or material take-offs (MTO) for a comprehensive solution.

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Applications of Our Steel Pipes

Frequently Asked Questions

What is the difference between Seamless and Welded (ERW) pipe?

Seamless pipes are extruded from a solid steel billet, leaving no weld seam. This gives them uniform strength and makes them ideal for high-pressure and high-temperature applications (like boilers or deep oil wells). Welded (ERW) pipes are formed by rolling a steel plate into a cylinder and welding the seam. They are more cost-effective, have highly uniform wall thickness, and are perfect for structural use and lower-pressure fluid transport.
What do SHS and RHS stand for?

SHS stands for Square Hollow Section, and RHS stands for Rectangular Hollow Section. These are welded steel tubes used primarily for structural framing. Their flat surfaces make them much easier to join and weld compared to round pipes, offering excellent strength-to-weight ratios for building construction.
What is 3PE coating on line pipes?

3PE stands for Three-Layer Polyethylene. It is an advanced anti-corrosion coating used on buried oil, gas, and water pipelines. It consists of an epoxy primer, an adhesive layer, and a tough polyethylene outer layer. 3PE provides excellent resistance to moisture, soil chemicals, and mechanical damage during backfilling.