304 / 1.4301 Stainless Steel Hollow Structural Sections | SHS RHS CHS Inox HSS ASTM A554

Peak Kong Special Steel leverages breakthrough laser hybrid welding technology and its independently developed automated tube production lines to achieve high-volume, high-precision production of 304 / 1.4301 austenitic stainless steel hollow structural sections, including square tubes, rectangular tubes, circular tubes, and customized box girders.
Our advanced manufacturing processes are specifically optimized for ultra-thick-wall and ultra-large-size profiles that are difficult to manufacture using conventional processes. The products are designed to meet stringent construction and industrial requirements under international standards, including European (EN), American (ASTM), Japanese (JIS), and British (BS) standards.
International Standards and SpecificationsWe strictly implement internationally recognized specifications, including the latest EN 10378:2025, EN 10219-3 for cold-formed stainless steel structural hollow sections, EN 10216-5 / EN 10217-7 for pressure-bearing tubes, and ASTM A554 for mechanical and structural tubing.
Authoritative Welding Process CertificationOur welding team and welding procedures have undergone TÜV and DNV audits and certification, and can fully interface with high-standard inspection and acceptance requirements such as the Hong Kong Laboratory Accreditation Scheme (HOKLAS) and government engineering projects.
100% Quality TraceabilityAll ultra-large and ultra-thick structural components can be manufactured using 100% full-penetration welding. Factory shipments are accompanied by official non-destructive testing reports (UT / MT / RT) and Material Test Certificates (MTC), ensuring structural safety and reliability under extreme loading conditions.

Common Specifications of Stainless Steel Hollow Structural SectionsSupporting Thick-Wall and Non-Standard CustomizationWith our 20 kW ultra-high-power laser hybrid welding technology, we overcome the limitations of conventional cold-forming and seamless extrusion processes regarding wall thickness and cross-sectional dimensions.
Four or more medium/thick steel plates can be precisely assembled and welded into a finished hollow section in a single manufacturing process. We support small-batch and multi-specification customization, allowing wall thickness and geometric dimensions to be freely configured according to customer drawings.
1. Square Hollow Sections (SHS)Common size range:
From 100 × 100 mm to 600 × 600 mm and above.
Wall thickness:
Up to 5 mm–30 mm and above, overcoming the cracking limitations commonly associated with conventional cold-formed thick-wall sections.
Process characteristics:
Laser-welded square sections feature sharp corners with an extremely small external corner radius (R), making them highly suitable for assembly and connection in architectural curtain walls and primary structural columns.
2. Rectangular Hollow Sections (RHS)Common size range:
150 × 100 mm, 200 × 100 mm, 300 × 150 mm, 400 × 200 mm to 800 × 400 mm, and other customized dimensions.
Wall thickness:
Up to 6 mm–40 mm.
Variable Cross-Section Box Girders:
We support precision welding of non-standard variable-section rectangular box girders, featuring gradual changes in height or width along the longitudinal direction.
3. Circular Hollow Sections (CHS)Common size range:
Large-diameter thick-wall tubes from Ø159 mm to Ø1200 mm and above.
Wall thickness:
8 mm–50 mm.
Application range:
In addition to structural load-bearing circular tubes complying with ASTM A554 / EN 10219, our products can also meet the process requirements of EN 10216-5 / EN 10217-7 for thick-wall stainless steel tubes used in pressure-bearing and fluid transportation applications.

Unique Advantages of Laser-Welded Stainless Steel Hollow Structural Sections1. Breaking Through Thick-Wall Limits with Precise Corner GeometryConventional cold forming of large-wall-thickness square and rectangular tubes can easily cause cracking at the R-corners, internal stress concentration, and excessive corner radii.
Peak Kong Special Steel utilizes a steel plate assembly and welding process to achieve ultra-thick-wall manufacturing while maintaining highly accurate external corner geometry and dimensional precision. This provides greater usable internal and external assembly space.
2. Exceptional Geometric Accuracy with Minimal DistortionHigh-power laser welding features high energy density and an extremely narrow heat-affected zone (HAZ).
This effectively addresses the “banana bending,” spiral distortion, and surface collapse that may occur in long tubes manufactured through conventional Submerged Arc Welding (SAW) or manual welding due to excessive heat input.
The result is excellent straightness, flatness, and dimensional accuracy, approaching mechanical-grade precision.
3. Excellent Retention of Mechanical and Corrosion-Resistance PropertiesFor 304 (1.4301) stainless steel, prolonged exposure to high temperatures during conventional high-current welding may cause intergranular sensitization, potentially reducing corrosion resistance.
4. Ultra-Low Heat Input and High Welding SpeedLaser hybrid welding provides extremely high welding speeds and ultra-low heat input, helping refine the grain structure.
Combined with a 100% full-penetration welding process, the welded joints can achieve excellent tensile and shear strength while maintaining corrosion resistance comparable to the base material when the qualified welding procedure and material conditions are properly controlled.
5. No Mold Cost and Flexible Small-Batch CustomizationUnlike seamless extrusion or hot-rolling processes that may require expensive tooling and dies, our laser welding process minimizes tooling requirements.
Whether it is an ultra-thick-wall lightweight hollow structural section or an asymmetric special-shaped hollow box girder, such as a box girder with integrated internal stiffeners, flexible production can be arranged even for small quantities.

Typical Applications of Stainless Steel Hollow Structural SectionsAs one of the world’s most widely used austenitic stainless steels, 304 / 1.4301 offers excellent fabricability and general corrosion resistance. After being manufactured into high-precision, ultra-thick and large-size hollow structural sections, it can be widely applied in the following fields:
High-End Architectural Curtain Walls and Structural Aesthetics
Precision concealed primary columns for large-scale modern glass curtain walls
Hollow structural frames for panoramic elevator shafts
Large-span spatial grid structures for stadiums, airports, and museums
Structural systems combining heavy-load-bearing capability with exposed architectural aesthetics
Premium Public Infrastructure and Concealed Structural Support
Exposed architectural and public-art structures requiring compact cross-sections and high visual quality
Primary load-bearing trusses for landscape bridges and pedestrian bridges
Food, Pharmaceutical and Clean Industrial Facilities
Heavy-duty columns and load-bearing frames in food-grade cleanroom
Hollow support platforms for large pharmaceutical reactors
Automated material transportation corridors
Structures capable of withstanding frequent high-pressure chemical cleaning and stringent hygiene requirements
Marine, Port and Coastal Outdoor Engineering
Hollow beam and column supports for coastal promenades and landscape walkways
Structural components for specialized coastal port machinery
Outdoor equipment frames operating in humid and salt-spray environments
Environmental Protection, Water Treatment and Chemical Equipment
Main frames of sludge scrapers and skimmers in large wastewater treatment plants
External load-bearing reinforcement structures for specialized stainless steel water tanks
Explosion-resistant piping systems for chemical gases and high-pressure fluid transportation

Contact Us — High-Precision Stainless Steel Structural SectionsIf you are looking for 304 / 1.4301 stainless steel hollow structural sections and customized processing services, please contact us.
Peak Kong Special Steel provides advanced, safe, internationally certified one-stop solutions for specialty steel materials, covering material supply, precision processing, customized fabrication, welding, inspection, quality documentation, and project-specific manufacturing.