S355JR Structural Steel Hollow Section for Building and Infrastructure Framework

Product Overview

Our S355JR Structural Steel Hollow Section is a high-strength, precision-manufactured product designed for modern building construction and infrastructure projects. Conforming to EN 10219 and EN 10210 standards, these hollow structural sections (HSS) provide an optimal strength-to-weight ratio that enables architects and engineers to create lighter, more efficient structures without compromising on load-bearing capacity. Available in square, rectangular, and circular profiles, our S355JR sections are the versatile backbone of contemporary construction.

Key Features & Advantages

• High-Strength S355JR Grade: Minimum yield strength of 355 MPa (for thickness ≤16mm) with tensile strength of 470-630 MPa, providing excellent load-bearing capacity and structural stability for demanding construction applications.
• Optimal Strength-to-Weight Ratio: Hollow section design delivers up to 30% weight reduction compared to solid sections of equivalent strength, reducing foundation loads, transportation costs, and handling requirements.
• Multi-Profile Availability: Supplied as square hollow sections (SHS), rectangular hollow sections (RHS), and circular hollow sections (CHS) in a comprehensive range of sizes from 20x20mm to 400x400mm.
• Excellent Weldability: Low carbon equivalent (CEV) ensures easy welding without pre-heating requirements, reducing fabrication time and costs on construction sites.
• Cold-Formed Precision: Manufactured through cold-forming and HF welding with consistent dimensions, straightness, and corner radii for predictable structural behavior in design calculations.

Application Scenarios

• Steel frame building structures: columns, beams, trusses, and purlins
• Bridge construction: pedestrian bridges, temporary works, and bridge support components
• Industrial facilities: warehouse frames, crane runways, and conveyor support structures
• Infrastructure projects: stadiums, airport terminals, railway stations, and exhibition halls
• Renewable energy: solar farm mounting structures and wind turbine tower internals
• Architectural features: exposed structural elements, canopies, and atrium framework

Company Capabilities

• Triple Certified: BV, SGS, ABS certified with EN 10204 3.1 inspection certificates and full CE marking compliance per EN 1090
• Quality Testing: 100% eddy current weld seam testing, flattening tests, dimensional inspection, and mechanical property verification
• Surface Treatment Options: Available as black (mill finish), primed/painted, hot-dip galvanized, or with custom coating systems for enhanced durability
• Annual Capacity: 10,000 tons, MOQ 1 ton, delivery 7-10 working days
• Flexible Payment: T/T or L/C accepted, pricing USD 600-1,500 per ton
• Export-Grade Packaging: Heavy hexagonal bundles with steel strip reinforcement, end protection, and full waterproof wrapping for ocean freight