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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
Product Description
The following is a comprehensive analysis of S355J2H steel pipes under the EN 10210 standard, covering steel grade classification, performance characteristics, application fields and comparative differences:
I. Overview of EN 10210 Standard
EN 10210 is the core standard for hot-formed structural steel tubes in Europe, applicable to seamless or welded structural hollow sections made of non-alloy steel and fine-grained steel. This standard is divided into two parts:
• EN 10210-1: Specifies chemical composition, mechanical properties and delivery conditions.
• EN 10210-2: Specification dimensions, tolerances and geometric accuracy.
II. Classification of Steel Grades and Comparison of Similarities and Differences
Under the EN 10210 standard, steel grades are classified into non-alloy steels (such as the S235-S355 series) and fine-grained normalized steels (such as the S420-S460 series), with the performance differences indicated by suffix-signs:
| Steel Grade Example | Yield Strength (mpa) | Tensile Strength (mpa) | Impact Toughness Requirements | Main Characteristics |
| S235JRH | ≥235 | 360-510 | temperature (≥27J) | Economic type at normal, suitable for static structure |
| S275J2H | ≥275 | 430-580 | -20 ℃ (≥27J) | Medium strength, suitable for low temperature |
| S355J2H | ≥355 | 470-630 | -20 ℃ (≥27J) | High strength, excellent low-temperature toughness |
| S355K2H | ≥355 | 470-630 | -20 ℃ (≥40J) | The impact toughness is higher than grade J2 |
| S460NH/NLH | ≥460 | 550-720 | -50℃ (NLH grade ≥40J) | Ultra-high strength, polar/ultra-low temperature environment |
Key differences
1.Strength grade: Increasing from S235 to S460 to meet different load requirements.
2. Low-temperature toughness: The suffix indicates the low-temperature performance (e.g. J2: -20℃; K2: Higher impact energy at -20℃; NLH: -50℃.
3. Chemical composition: Fine-grained steel (such as S460NH) is added with microalloying elements like Nb and V to refine the grain structure and enhance toughness.
III. Core Performance Characteristics of S355J2H Steel Pipe
1. High strength and lightweight
The yield strength is ≥355 MPa, and the tensile strength is 470-630 MPa, significantly higher than that of ordinary carbon steel (such as Q235), reducing self-weight when supporting large-span structures.
• Density 7.85g /cm³, optimizing structural efficiency.
2. Excellent low-temperature toughness
The impact energy at -20℃ is ≥27J, avoiding the risk of brittle fracture in cold regions such as Northern Europe and Canada.
3. Welding and processing performance
• Carbon equivalent (Ceq) ≤0.45%, supporting conventional welding processes; Preheat to 200-300℃ and use low-hydrogen electrodes to prevent cold cracking.
The cold working plasticity is moderate (deformation rate ≤30%), and the fillet of the mold should be ≥1.5 times the wall thickness to prevent cracking.
4. Weather resistance and lifespan
Through hot-dip galvanizing, epoxy coating or sandblasting treatment, the corrosion resistance is enhanced by more than 30%, extending the service life in Marine environments.
IV. Core Application Fields
1. Building structure
• High-rise frame: Support columns, roof trusses, utilize high compressive strength to resist wind loads.
• Large venues: Stadium domes, airport terminals, lightweight design reduces foundation load.
2. Bridges and Heavy Engineering
• Cross-sea bridge: Box girder and pier structure, with salt spray corrosion resistance characteristics suitable for Marine environments.
• Heavy machinery: Crane booms, mining equipment chassis, bearing dynamic impact loads.
3. Energy and Offshore Platforms
• Wind power tower: The flange connection parts should be in the normalized state S355J2H and meet the ISO 630 strength standard.
• Oil drilling platform: The jacket structure has passed the -40℃ impact test, ensuring the safety of polar operations.
4. Auxiliary facilities
Staircase handrails and equipment supports, taking into account both safety and aesthetics.
V. Summary of the Advantages of EN 10210 Steel Pipes
Advantage | Description |
Process advantage | The thermoforming process reduces residual stress and is superior to the work hardening problem of cold-formed tubes (EN 10219). |
High standardization | Strict tolerances (outer diameter ±1%, wall thickness -10%) ensure the accuracy of structural assembly. |
Low life cycle cost | High durability, and reduced maintenance. The 30-year service cycle cost is 15-20% lower than that of ordinary steel. |
VI. Selection Suggestions
• S355J2H: Suitable for scenarios with high dynamic loads above -20℃ (such as Bridges and heavy machinery).
• S355K2H: It can replace J2 grade when higher impact requirements are imposed, such as in polar equipment.
• S460NH: The preferred choice for super high-rise buildings or ultra-low temperature energy facilities.
Through thermoforming processes and composition optimization, EN 10210 S355J2H achieves a balance among strength, toughness and weather resistance, making it an ideal choice for modern load-bearing structures. The future trend points to ultra-pure smelting (S≤0.005%) and intelligent rolling, further enhancing the performance boundary.
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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