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

S355JR structural steel hollow section

steel tube for building framework

infrastructure steel hollow section

S355JR Structural Steel Hollow Section for Building and Infrastructure Framework Images