Complete pipeline solutions from wellhead to refinery — API 5L line pipe, OCTG casing, and anti-corrosion coated pipe for onshore and offshore oil & gas transmission.
Oil and gas pipelines are the arteries of the global energy infrastructure, transporting crude oil, natural gas, and refined products across continents. At Sino East Steel, we manufacture and supply the full spectrum of steel pipe products required for every stage of the hydrocarbon value chain — from upstream exploration and production to midstream transmission and downstream refining.
Onshore pipelines require cost-effective, high-strength steel pipe capable of withstanding internal pressure, soil loads, and environmental corrosion over decades of service. Our API 5L LSAW and SSAW pipes are the preferred choice for cross-country transmission lines, gathering systems, and distribution networks. With diameters up to 120 inches and grades up to X80, we provide the optimal balance of strength, toughness, and weldability.
Offshore pipelines operate in one of the most demanding environments on earth — extreme pressures, corrosive seawater, and dynamic loading from waves and currents. Our offshore-grade line pipe is manufactured to DNV-OS-F101 and API 5L PSL2 with supplementary requirements including CTOD testing, tighter dimensional tolerances, and enhanced NDT inspection protocols.
Before oil and gas can be transported, it must be extracted. Our API 5CT OCTG casing and tubing products provide the well integrity needed for safe and efficient production. From surface casing to production tubing, we supply J55 through P110 grades with premium connections for the most challenging well conditions.
| Standard | Scope | Application |
|---|---|---|
| API 5L | Line Pipe Specification | Onshore and offshore transmission pipelines |
| API 5CT | Casing & Tubing Specification | Oil and gas well construction |
| DNV-OS-F101 | Submarine Pipeline Systems | Offshore and subsea pipelines |
| ISO 3183 | Petroleum & Natural Gas Industries — Steel Pipe | International line pipe standard aligned with API 5L |
| NACE MR0175 / ISO 15156 | Sour Service Materials | H₂S-containing environments (sour gas) |
| DEP (Shell), GS (Total), SAES (Aramco) | Company Specifications | Supplementary requirements from major operators |
Longitudinal submerged arc welded pipe for high-pressure transmission. Single seam, excellent dimensional accuracy.
Spiral submerged arc welded pipe, ideal for large-diameter water and slurry alongside oil & gas gathering lines.
No-weld pipe for small-diameter, high-pressure applications including flowlines and gathering systems.
API 5CT casing and tubing for well construction, including premium connections for challenging wells.
Three-layer polyethylene external coating — the industry standard for buried oil and gas pipelines.
Complete range of butt-weld fittings, forged fittings, and flanges for pipeline connections and tie-ins.
Contact our engineering team for technical specifications, material recommendations, and a competitive quotation.
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