UNS S32205 S31803 Duplex Stainless Steel Hollow Structural Section SHS RHS CHS Tube Pipe

Advanced Laser Hybrid Welding + CMT Technology for High-Precision Duplex Stainless Steel Hollow SectionsPeak Kong Special Steel utilizes advanced laser hybrid welding + CMT technology and its independently developed tube production lines to achieve high-volume, high-precision manufacturing of UNS S32205 / UNS S31803 duplex stainless steel hollow structural sections.
We specialize in the production of thick-wall hollow sections with wall thicknesses of up to 30 mm, fully supporting stringent construction and industrial standards across Europe, the United States, Japan and the United Kingdom, including EN, ASTM, JIS and BS standards, and providing reliable solutions for high-end engineering projects worldwide.
Peak Kong Special Steel: Advanced Technology, Manufacturing Capability and International StandardsComprehensive International Standards CoverageOur products are manufactured in accordance with applicable structural and tubular product standards, including the latest European EN 10378:2025, EN 10219 and EN 10216, as well as ASTM A554 in the United States.
The products can also be designed and supplied in accordance with Eurocode 3 (EN 1993) for stainless steel structural design, providing structural engineers with reliable material and fabrication support for engineering calculations.
Authoritative Welding Procedure QualificationOur welding team and welding procedures are subject to authoritative qualification and audit requirements, including TÜV and DNV standards and project-specific verification.
100% Quality Traceability and International Market AccessOversized structural components can be manufactured with 100% full-penetration welding according to applicable product design and welding procedure requirements.
Factory documentation can include official inspection reports, non-destructive testing records and complete Material Test Certificates (MTC 3.1 / 3.2).
CE and UKCA compliance support can also be provided according to project requirements, facilitating supply to European and UK engineering projects.
Advanced Thick-Wall FabricationOur manufacturing technology addresses the work-hardening and forming challenges associated with duplex stainless steel, supporting customized hollow structural sections with wall thicknesses of up to 30 mm.
Advanced fabrication processes provide precise geometry, dimensional consistency and high squareness for demanding structural applications.
UNS S32205 / UNS S31803 Duplex Stainless Steel Hollow Section Size RangeSquare Hollow Sections (SHS)50 × 50 × 4 mm to 600 × 600 × 30 mm
Rectangular Hollow Sections (RHS)60 × 40 × 4 mm to 800 × 400 × 30 mm
Circular Hollow Sections (CHS)Φ60 × 4 mm to Φ1200 × 30 mm
Non-Standard Customized Hollow SectionsNon-standard hollow structural sections can be manufactured according to customer requirements, including special outside dimensions, customized wall thicknesses and irregular or engineered cross-sections.
All specifications support customized lengths, precision sawing and surface finishing, including polishing and pickling/passivation treatment.
Customers are welcome to provide drawings for technical review and manufacturing evaluation.
Applications of Duplex Stainless Steel Hollow Structural SectionsHigh-End Construction and Marine EngineeringStructural steel systems for coastal landmark buildings
High-rise glass curtain wall support systems
Pedestrian bridges
Large-scale infrastructure projects in Hong Kong and overseas
Marine terminals and port structures
Trusses for sea-crossing bridges
Breakwaters
Coastal promenade support structures

Water Treatment and Environmental EngineeringStructural frames for large-scale seawater desalination plants
Heavy-duty equipment bases for wastewater treatment plants
Municipal water supply and drainage pipe racks
Structural support systems for water treatment facilities

Oil, Gas and Chemical Processing FacilitiesModular structural frames for offshore drilling platforms
Corrosion-resistant equipment supports in chemical plants
Material handling corridors
Flare tower structures
Pipe racks and process support structures

Heavy Machinery and TransportationCrane booms and cantilever structures for ports
Structural frames for rail transportation vehicles
Load-bearing superstructures for special-purpose vessels
Heavy-duty machinery support structures
Transportation and equipment support frames

Contact Peak Kong Special SteelFor UNS S32205 / UNS S31803 duplex stainless steel hollow structural section fabrication services and the latest quotation, please contact us with your required specifications, drawings, dimensions, quantities and application requirements.
Peak Kong Special Steel provides advanced, safety-focused and internationally compliant specialty steel solutions, covering material supply, customized fabrication, precision welding, inspection, documentation and one-stop engineering support.