EN 10210 S355J2H Square Hollow Section

As a leading steel profile manufacturer with 12 years of export experience, ShunChen specializes in high-performance structural hollow sections. Our production base in Tianjin is equipped with multiple fully automated cold-forming production lines, precision welding equipment and a national-level material testing laboratory, focusing on the R&D and production of square hollow sections compliant with EN 10210 standard, suitable for steel structure construction, bridge engineering, mechanical equipment and curtain wall support scenarios.

Different from ordinary welded square tubes with unstable material properties, large dimensional deviation and poor low-temperature resistance, our EN 10210 S355J2H square hollow sections use high-quality fine-grained structural steel billets, matched with advanced cold-forming and high-frequency welding processes. Strict multi-pass surface pretreatment + precision forming + online ultrasonic flaw detection processes are adopted to form a uniform and stable structural section. Our senior quality control team with years of industry experience conducts full-process tracking and inspection for each batch of products, ensuring side length tolerance ≤±0.5mm, straightness ≤1mm/m, and weld strength coefficient ≥0.95. All products comply with EN, GB, ASTM and JIS standards, and can provide complete mill test certificates (MTC EN 10204 3.1) and third-party SGS inspection reports.

Real-world Performance Testing

1. Low-temperature Impact Toughness Test (Third-party SGS Test)Test 

Standard: EN 10210-1, EN ISO 148-1 Test Conditions: -20℃ Charpy V-notch impact test, 3 parallel samples per batch

Test Samples:

· Ordinary Q235 welded square tube

· Standard S355JR square hollow section

· EN 10210 S355J2H square hollow section

Key Findings:

· Ordinary Q235 square tube: Average impact energy ≤27J at room temperature, obvious brittle fracture at 0℃, not suitable for low-temperature environment

· S355JR square hollow section: Stable performance at room temperature, impact energy drops sharply below -10℃, cannot meet low-temperature construction requirements

· S355J2H square hollow section: Average impact energy ≥27J at -20℃, ductile fracture morphology, stable performance in low-temperature and high-altitude scenarios

2. Dimensional Accuracy & Straightness InspectionTest

 Standard: EN 10210-2

Test Results:

· Side length tolerance: ±0.5mm (far better than standard ±1.0mm requirement)

· Wall thickness tolerance: ±0.1mm

· Straightness: ≤1mm per meter, total straightness ≤0.1% of total length

· End face perpendicularity: ≤0.3°

High-precision dimensional control effectively reduces on-site cutting and adjustment workload, improves installation efficiency and structural assembly accuracy.

3. Welding & Mechanical Property Test

Tested in accordance with EN 10210 and relevant European structural steel standards, core performance indicators are as follows:

· Yield Strength: ≥355MPa (for thickness ≤16mm)

· Tensile Strength: 470~630MPa

· Elongation (A5): ≥22%

· -20℃ Charpy Impact Energy: ≥27J (longitudinal)

· Weld strength coefficient: ≥0.95, no crack after 180° bending test

The fine-grained steel base + high-frequency precision welding process realizes the perfect combination of structural strength, low-temperature toughness and processing performance, adapting to on-site welding, bending, punching and other construction requirements.

Real-world User Scenarios & Verified 

CasesCase 1: Large Steel Structure Factory Building Project (Northern European Engineering Co., Ltd.)Industry: Industrial steel structure construction Problem: The ordinary square steel tubes used in the original project had poor low-temperature toughness, and brittle fracture risks existed in the winter low-temperature environment of -15℃ to -20℃. The dimensional deviation was large, which slowed down the on-site installation progress and increased construction costs. Solution: Adopt ShunChen EN 10210 S355J2H square hollow section, specification 150×150×6mm, with hot-dip galvanized surface treatment for corrosion resistance. Result: After 6 years of service in low-temperature environment, the structural stress is stable, no brittle fracture or deformation occurs. The high dimensional accuracy increases on-site installation efficiency by 35%, and the overall service life of the structure is extended to more than 30 years. The annual procurement volume reaches 1800 tons, and the two parties have maintained long-term cooperative relations.

Case 2: Urban Commercial Complex Curtain Wall Support Project (Domestic Construction Engineering Group)

Industry: Commercial building curtain wall engineering Problem: The curtain wall support system has high requirements for the straightness, dimensional accuracy and surface flatness of steel profiles. Conventional products have large straightness deviation and uneven surface, which affects the installation accuracy and overall aesthetic effect of the curtain wall. Solution: Select high-precision EN 10210 S355J2H square hollow section, strictly control straightness and end face perpendicularity, and customize surface galvanized + powder coating treatment. Result: The support components are installed accurately, the overall stress of the curtain wall is uniform, and the appearance effect meets the design requirements. It passed the acceptance of the construction party at one time. After 5 years of use, the product has stable performance and has become the designated steel profile for the group's subsequent curtain wall projects.

Case 3: Large Mechanical Equipment Frame Manufacturing Project (East China Machinery Manufacturing Co., Ltd.)Industry: Mechanical equipment manufacturing Problem: Ordinary square tubes have unstable mechanical properties, and welding deformation is easy to occur during the processing of equipment frames. The finished product has low qualification rate and cannot meet the load-bearing requirements of heavy equipment. Solution: Use EN 10210 S355J2H square hollow section with uniform material properties and good welding performance, customized according to equipment frame size specifications. Result: The welding deformation of the product during processing is small, the frame load-bearing performance meets the design requirements, and the rejection rate of finished products drops from 5.8% to 0.9%. It effectively helps the company improve product quality and expand the market share of heavy equipment.

Authentic Customer Reviews

"In the low-temperature environment of Northern Europe, the low-temperature toughness of structural steel is the core index. Your EN 10210 S355J2H square hollow sections have stable performance and reliable quality, which fully meets our engineering construction standards and is our preferred cooperative supplier." —— Hans Mueller, Project Manager, Northern European Engineering Co., Ltd.

"We use square hollow sections for curtain wall support systems. Your products have high dimensional accuracy and good straightness, which greatly improves our on-site installation efficiency. The technical team can also provide customized surface treatment solutions according to project requirements, very professional." —— Li Ming, Procurement Director, Domestic Construction Engineering Group

"Stable mechanical properties and good welding performance are the key to mechanical frame manufacturing. Your S355J2H square tubes have uniform material and small welding deformation, which effectively reduces processing losses. We have maintained stable cooperation for many years." —— Zhang Wei, Production Supervisor, East China Machinery Manufacturing Co., Ltd.Verified Product Parameters

(1) General Execution Standards

(2) Core Technical Parameters

(3) Chemical Composition (wt%, S355J2H)

(4) Mechanical Properties (S355J2H, t≤16mm)

Core Advantages

1. Standard Compliance & Reliable Performance: All products are produced in strict accordance with EN 10210 European standard, and mechanical properties and dimensional accuracy have passed authoritative third-party testing, with complete test reports available for inquiry.

2. Excellent Low-temperature Toughness: S355J2H grade guarantees stable impact energy above 27J at -20℃, effectively avoiding brittle fracture risk, and is suitable for low-temperature environments in high-latitude regions and high-altitude projects.

3. High Precision Dimensional Control: Full-process automatic monitoring of size and straightness, with tolerance far better than standard requirements, reducing on-site adjustment workload and improving installation and processing efficiency.

4. Strong Processing Adaptability: Uniform material structure, excellent welding and bending performance, small deformation during processing, suitable for cutting, punching, welding and other deep processing in various scenarios.

5. Complete Surface Treatment Options: Support hot-dip galvanizing, powder coating, painting and other anti-corrosion treatments, which can significantly extend the service life of products in outdoor and corrosive environments.

Suitable For

· Steel Structure Industry: Factory building frames, stadium steel structures, warehouse shelves, light steel houses, bridge support structures

· Construction & Curtain Wall: Building curtain wall support keels, glass curtain wall frameworks, exterior wall decorative support structures

· Machinery Manufacturing: Equipment frames, mechanical supports, agricultural machinery components, lifting equipment structures

· Transportation Industry: Container frames, truck body structures, guardrail supports, signal pole structures

· Other Industries: Solar support structures, power transmission towers, pipeline supports, advertising board frames

Why Choose Tianjin ShunChen

Looking for a cost-effective and high-quality EN 10210 S355J2H square hollow section supplier for steel structure, curtain wall and machinery manufacturing projects? We have 12 years of export experience as a professional structural hollow section manufacturer.

We keep a large stock of conventional specifications all year round, supporting delivery within 3-7 days. Our professional technical team provides one-stop solutions including material selection, specification matching and process optimization according to your usage scenarios. Factory direct sales eliminate intermediate links, with competitive prices and stable product quality. Contact ShunChen now to get free samples and detailed quotations!

Real Product & Shipment Gallery

Production & Quality InspectionFully 

automatic cold-forming production line High-frequency precision welding equipment Online dimensional testing system (100% on-line detection) Universal material testing machine & low-temperature impact testing equipment

Product Display

Black finish EN 10210 S355J2H square hollow section Hot-dip galvanized square hollow section Custom powder coated rectangular hollow section Large-thickness structural square tube

Shipment & Packaging

Standard export packaging: Waterproof film + steel strapping + wooden pallet protection Custom logo packaging is supported Container loading standard: 20ft container ≈25 tons; 40ft container ≈28 tons (bulk) / 25 tons (pallet) Complete shipping documents: Bill of lading, commercial invoice, MTC EN 10204 3.1, third-party inspection report

Customer Application Scenarios

Steel structure factory building frame project Commercial building curtain wall support project Mechanical equipment frame manufacturing project Bridge & transportation facility project

Popular Tags

EN 10210 S355J2H, square hollow section, SHS tube, structural steel tube, S355 square tube, cold formed steel section, steel structure tube, galvanized square tube, China steel profile manufacturer

Related Categories

Rectangular Hollow Section, Circular Hollow Section, Galvanized Steel Tube, Welded Steel Pipe, Seamless Steel Tube, Angle Steel, Channel Steel, H Beam, I Beam