QUANGE GUANYE
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30
2025
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03
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The characteristics of steel pipes used in ocean engineering focus on corrosion resistance and structural strength. Seawater pipelines use super austenitic stainless steel (such as 254SMO), with chromium, molybdenum, and nitrogen content exceeding 30%. In seawater with a salinity of 3.5%, the pitting resistance equivalent (PREN) ≥40, and the corrosion resistance is more than twice that of ordinary 316 stainless steel.
The characteristics of steel pipes used in ocean engineering focus on corrosion resistance and structural strength. Seawater transport pipelines use super austenitic stainless steel (such as 254SMO), with chromium, molybdenum, and nitrogen content exceeding 30%. In seawater with a salinity of 3.5%, the pitting resistance equivalent (PREN) ≥40, and the corrosion resistance is more than twice that of ordinary 316 stainless steel. Steel pipes for offshore platform legs use quenched and tempered high-strength steel (such as E690), with a yield strength ≥690MPa, capable of withstanding alternating loads generated by wave impacts, and a fatigue life exceeding 1 million cycles.
Its advantages are particularly prominent in marine environments. Compared with traditional carbon steel with coating protection, stainless steel pipes have more durable corrosion resistance, reducing the need for underwater painting, cathodic protection, and other maintenance measures, thereby lowering the life-cycle cost. In deep-sea areas (water depth exceeding 1000 meters), the pressure resistance of steel pipes is crucial. Thick-walled seamless steel pipes (wall thickness up to 50mm) are used, capable of withstanding external pressures exceeding 10MPa, ensuring that the pipes do not experience instability and failure in deep-sea environments. In addition, the weldability of steel pipes allows for on-site connection on offshore platforms, adapting to the complex installation requirements of the project.
Applications cover multiple ocean engineering fields. In offshore wind power projects, large-diameter steel pipes used for monopile foundations have diameters of 6-8 meters and lengths exceeding 60 meters. They are spirally embedded in the seabed to provide stable support for wind turbines. Subsea oil and gas pipelines use double-layer insulated steel pipes, with the inner layer transporting oil and gas, and the outer protective pipe using corrosion-resistant alloys, with insulation material filled in between, suitable for deep-sea low-temperature environments. The water intake network of seawater desalination plants uses steel pipes resistant to seawater corrosion to ensure that no rust pollution occurs during raw water transportation, improving the quality of desalinated water.
To meet the high standards of ocean engineering, steel pipe companies strengthen cooperation with research institutions to conduct research on deep-sea steel composition optimization and welding processes. Currently, many domestic companies have the ability to produce high-end steel pipes for ocean engineering, and product performance has reached internationally advanced levels, gradually replacing imported products.
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