2304 1.4362 Duplex Stainless Steel Hollow Structural Section SHS RHS CHS Tube Pipe

High-Strength Duplex Stainless Steel | Laser Hybrid Welding + CMT Technology | Specialized in 30 mm Thick-Wall Structural Tubes
In demanding engineering projects such as long-span sea-crossing bridges, offshore platforms, coastal infrastructure, chemical equipment, and large public buildings, structural profiles must not only withstand substantial mechanical loads but also provide long-term resistance to humidity, salt spray, chloride ions, and complex chemical media.

2304 / 1.4362 duplex stainless steel combines relatively high strength, good toughness, and excellent corrosion resistance, making it a high-performance material option for engineering applications requiring high load capacity, long service life, and reduced maintenance.

煌港特鋼有限公司 (Peak Kong Special Steel) utilizes its independently developed advanced tube-production line, together with laser hybrid welding and CMT (Cold Metal Transfer) technology, to specialize in the high-precision, batch, and flexible manufacturing of 2304 / 1.4362 duplex stainless steel hollow structural sections.

We provide reliable, precise, and traceable structural tube solutions for high-end engineering projects worldwide.

Laser Hybrid Welding — Overcoming Manufacturing Challenges in Thick-Wall Duplex Stainless Steel
Duplex stainless steel is sensitive to welding thermal cycles, heat input, and cooling rates. If conventional welding processes are not properly controlled, an imbalance in the weld and heat-affected-zone microstructure may occur, potentially affecting the mechanical properties, toughness, and corrosion resistance of the welded joint.

To meet the manufacturing requirements of thick-wall duplex stainless steel tubes, 煌港特鋼 combines laser hybrid welding with CMT technology:
Laser Welding
Provides high energy density, deep penetration, and high-speed welding capability.
CMT Welding
Provides low heat input, low spatter, and reduced distortion, helping improve weld filling and formation.
Hybrid Heat-Source Control
Enables precise adjustment of welding energy, penetration depth, cooling conditions, and weld geometry.
Low-Distortion Manufacturing
Effectively reduces angular distortion, ovalization, and residual stress during the fabrication of thick-wall tubes.
High-Consistency Production
Suitable for continuous manufacturing of large-size, thick-wall, and long-length structural tubes.

Under applicable material, dimensional, and process conditions, the production line can manufacture high-quality structural tubes with wall thicknesses of up to approximately 30 mm, meeting the requirements of large load-bearing structures for weld integrity, geometric accuracy, and dimensional stability.

Full-Penetration Welding for Enhanced Structural Connection Reliability
For large and thick-wall hollow structural sections, 煌港特鋼 regards full-penetration welding as an important manufacturing objective.

Through welding parameter control, filler-metal matching, joint design, and non-destructive testing, we aim to ensure good continuity at the weld root and fusion zone.

Products can be manufactured and inspected according to project technical requirements, including:

Full-penetration welding

Weld visual and geometric inspection

Ultrasonic testing (UT)

Penetrant testing (PT)

Radiographic testing (RT)

Dimensional and geometric-tolerance inspection

Material performance and welded-joint verification

Comprehensive process control helps reduce the risk of porosity, lack of fusion, incomplete penetration, cracking, and other welding defects.

The actual strength, phase balance, corrosion resistance, and inspection level of welded joints shall be determined according to the product specification, qualified welding procedure, and project-specific technical requirements.

2304 / 1.4362 Hollow Structural Section Specifications
Supported by an intelligent and flexible tube-production line, 煌港特鋼 can manufacture square, rectangular, and circular hollow structural sections, as well as non-standard profiles based on customer drawings.
Square 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
Ø60 × 4 mm to Ø1200 × 30 mm
Non-Standard Custom Structural Sections
According to engineering drawings and structural design requirements, customized solutions can include:

Special outside diameters and side dimensions

Non-standard wall thicknesses

Elliptical and irregular cross-sections

Variable-section hollow structural profiles

Large built-up tubular structures

Special end configurations, openings, and connection details

High-appearance-quality tubes for AESS (Architecturally Exposed Structural Steel) applications

Actual dimensional ranges, wall thicknesses, tolerances, material conditions, and supply conditions shall be confirmed according to project specifications and applicable standards.

Combining High Strength with Corrosion Resistance
2304 / 1.4362 duplex stainless steel hollow structural sections combine material performance with the structural efficiency of hollow cross-sections, making them particularly suitable for structural systems subjected to axial forces, bending moments, shear forces, and combined loading.
Key Engineering Advantages
High Load-Bearing Capacity
Helps improve the structural efficiency of columns, beams, trusses, and support members.

Good Corrosion Resistance
Suitable for coastal, humid, and various industrial environments.

Improved Resistance to Stress Corrosion Cracking
Provides enhanced potential resistance under chloride-containing and high-stress service conditions.

Efficient Cross-Sectional Utilization
Hollow sections offer favorable bending and torsional performance.

Potential for Structural Weight Optimization
Can be combined with engineering calculations to investigate member weight reduction and cross-section optimization.

High Surface and Appearance Quality
Suitable for exposed structural steel and high-end architectural applications.

Reduced Maintenance Requirements
May reduce reliance on certain conventional corrosion-protection coatings and periodic maintenance activities.

Actual weight reduction, service life, and corrosion-protection requirements must be professionally evaluated according to environmental classification, loading conditions, design life, connection configuration, and applicable codes and standards.

International Standards and Quality Traceability
煌港特鋼 has established a comprehensive quality-management system covering raw materials, welding procedures, process control, dimensional inspection, and finished-product delivery, in accordance with the quality requirements of international engineering projects.

Products and manufacturing processes can be referenced to applicable project requirements and standards, including:

EN 10378

EN 10219 — Cold-formed welded structural hollow sections

EN 10216 — Seamless steel tubes for pressure purposes

ASTM A554 — Welded stainless steel mechanical tubing

EN 10088 Series — Stainless steel material standards

Relevant ASTM, JIS, and BS standards

Inspection requirements from SGS, TÜV, DNV, and other independent third-party organizations

According to contractual and project specifications, delivery documentation may include:

Material Test Certificates (MTC)

EN 10204 3.1 or 3.2 documentation

Welding procedure qualification and welding procedure documentation

Dimensional and visual inspection reports

Non-destructive testing reports

Weld quality inspection records

Production-batch and digital traceability records

Where required, 煌港特鋼 can also coordinate testing, acceptance inspection, and performance witnessing with HOKLAS-accredited laboratories and other independent third-party organizations.

Applications for High-Load and Highly Corrosive EngineeringBridges and Major Sea-Crossing Infrastructure
Suitable for corrosion-resistant piles and columns for sea-crossing bridges, tubular arches, heavy-duty coastal foundation columns, bridge lattice structures, subsea utility corridors, and large municipal structures.

The hollow cross-section provides favorable bending and torsional performance, making these sections suitable for complex loading conditions and long-term outdoor exposure.
Marine, Port and Water Infrastructure
Applications include tubular frames for offshore operating platforms, port retaining piles, supports in tidal zones, load-bearing structures for coastal sluice gates, and support systems for water-treatment facilities.

These applications require durable performance under humid, salt-spray, and chloride-containing environments.
Petrochemical and Heavy Industry
Suitable for chemical pipe racks, equipment support frames, thick-wall load-bearing columns, external structures surrounding storage tanks and reaction equipment, pulp and paper industry frames, and industrial facilities exposed simultaneously to chemical media and mechanical loads.
AESS Architecture and Public Transportation Hubs
Applications include high-speed railway stations, airport terminals, large-span roof space frames, stadiums, and high-end curtain-wall support systems.

Precision welded formation and high-quality surface appearance can help satisfy the demanding requirements of exposed structural steel regarding straightness, surface finish, connection nodes, and architectural detailing.

One-Stop Technical Services from Design to Delivery
According to customer engineering requirements, 煌港特鋼 provides integrated services covering the entire process from preliminary design to finished-product delivery:

Material selection and performance analysis

Preliminary structural drawing review

Hollow-section optimization and manufacturability analysis

Non-standard dimensions and thick-wall tube customization

Laser hybrid welding and CMT process consultation

Small-batch and multi-specification flexible production

Third-party inspection and engineering acceptance support

Material, welding, and NDT documentation

Professional delivery services for Hong Kong and international projects

Advanced Welding Technology for the Future of High-Performance Steel Structures
2304 / 1.4362 duplex stainless steel hollow structural sections combine the strength and corrosion resistance of duplex stainless steel with the efficient load-bearing characteristics of hollow cross-sections.

Combined with laser hybrid welding and low-heat-input CMT manufacturing technology, they provide large engineering projects with structural solutions that can be lighter, stronger, more durable, and more flexible in design, subject to engineering verification and project-specific requirements.

煌港特鋼有限公司 (Peak Kong Special Steel)
Specialist in Duplex Stainless Steel Thick-Wall Structural Tubes
Precision Manufacturing for Global High-Load and High-Durability Engineering

If you are planning projects involving sea-crossing bridges, offshore platforms, chemical facilities, seawater desalination plants, public transportation hubs, or high-end architecture, contact 煌港特鋼 for professional customization solutions covering 2304 / 1.4362 duplex stainless steel SHS, RHS, CHS, and non-standard hollow structural sections.