S31803 Bright Annealed Duplex Seamless Tube – Corrosion Resistance for Heat Exchangers, Boilers, Offshore and Petrochemical Systems

S31803 duplex stainless steel seamless tube combines high mechanical strength with exceptional corrosion resistance, making it an ideal material for heat exchangers, boilers, offshore platforms, and petrochemical systems.

SMLSCO operates advanced production lines including cold rolling, bright annealing, and nondestructive testing. With a global inventory network and efficient delivery capability, we respond quickly to engineering project demands. SMLSCO provides stable supply and reliable technical assurance, supporting SGS/TUV third-party inspection to ensure safety and long-term service performance.

S31803 provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking, especially suitable for chloride-containing seawater environments. Its duplex microstructure offers significantly higher yield strength, delivering superior performance under pressure. The material maintains structural stability under extreme operating conditions including high temperature, high pressure, salt spray, and sulfide environments.

S31803 seamless tubes are widely used in oil and gas extraction and offshore platform piping systems, refining and petrochemical process lines, chemical plant material transfer pipelines, seawater desalination heat exchangers, high-pressure boilers, and waste heat recovery units. With excellent mechanical strength and corrosion resistance, they operate reliably in harsh conditions such as salt-fog, acidic/alkaline solutions, chloride-rich environments, and high-temperature steam.

SMLSCO's production process includes piercing, cold rolling, solution treatment, bright annealing, pickling & passivation, straightening, and nondestructive testing. Each key step is monitored by the QC team, with photo documentation and archived records to ensure full traceability.