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Profile Steel I beam SS400
Standard traceability: SS400 is a common structural rolled steel grade specified in the Japanese Industrial Standard JIS G 3101. "SS" stands for "Steel Structure" and "400" stands for its minimum tensile strength of 400 MPa (N/mm²).
National Standard Correspondence: In the Chinese market, the performance indicators of SS400 are closest to the Q235B grade in the national standard GB/T 700. The two are highly similar in chemical composition and mechanical property requirements. Both are carbon structural steels with good comprehensive mechanical properties (strength, plasticity, toughness) and excellent weldability and machinability.
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Reliable strength
Meet the basic strength requirements of structural bearing (yield strength ≥ 235 MPa, tensile strength 400-510 MPa).
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Good toughness
I beam steel has sufficient impact toughness at room temperature and can withstand certain dynamic loads.
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Excellent processability
I beam steel is easy to cut, drill, bend and weld (appropriate process is required), and the construction is convenient and efficient.
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Economical and practical
Compared with high-strength steel, SS400 has lower cost and can effectively control project costs while meeting design requirements.
Mechanical properties
| Performance indicators | Standard requirements | Measured typical values (for reference only) | Importance description |
|---|---|---|---|
| Yield strength (ReH) | ≥ 235 MPa | 245 - 300 MPa | The stress at which the material begins to undergo significant plastic deformation |
| Tensile strength (Rm) | 400 - 510 MPa | 410 - 480 MPa | The maximum ability of a material to resist fracture |
| Impact energy (longitudinal) | ≥ 27J (normal temperature, V-notch) | ≥ 35J | The ability of the material to resist impact loads |
Chemical composition
| Element | Standard requirement (%) | Measured control range (%) | Impact on performance |
|---|---|---|---|
| Carbon (C) | ≤ 0.22 (SS400) / ≤ 0.20 (Q235B) | 0.14 - 0.18 | Main strengthening element, improves strength, reduces plasticity |
| Silicon (Si) | ≤ 0.35 (SS400) / ≤ 0.35 (Q235B) | 0.10 - 0.25 | Deoxidizer, improve strength and hardness |
| Manganese (Mn) | ≤ 1.40 (SS400) / ≤ 1.40 (Q235B) | 0.40 - 0.70 | Increase strength, toughness, and improve hot workability |
| Phosphorus (P) | ≤ 0.050 (SS400) / ≤ 0.045 (Q235B) | ≤ 0.030 | Harmful element, reduces plasticity and toughness, causes cold brittleness |
|---|---|---|---|
| Sulfur (S) | ≤ 0.050 (SS400) / ≤ 0.045 (Q235B) | ≤ 0.025 | Harmful element, causing hot brittleness and reducing weldability |
Advantages of I-beam structure: scientific cross-section design, doubled load-bearing efficiency
The "I"-shaped section of the I-beam achieves a perfect balance between lightness and high strength by optimizing material distribution:
Upper and lower flanges: wide and thick, resisting the bending stress of vertical load.
Middle web: thin and high, bearing shear force and connecting flanges.
Large moment of inertia: at the same weight, the bending resistance is increased by more than 30% compared with rectangular steel.
Application
Construction engineering: high-rise frames and factory roofs
Steel beams and columns: hot rolled steel i beam used for the main support structure of factories, warehouses, and commercial complexes.
Truss system: large-span roof design, reducing internal pillars and improving space utilization.
Floor reinforcement: as a secondary beam to bear the load of concrete floor slabs, ensuring safety and durability.
Bridge engineering: the first choice for small and medium-span bridges
Main beam structure: suitable for load-bearing beams of highway bridges and railway bridges, with strong fatigue resistance.
Temporary support: steel i beam supports formwork during construction, fast installation and disassembly, and high reuse rate.
Mechanical manufacturing: equipment frame and conveying system
Production line base: provide a stable foundation for machine tools and stamping equipment to reduce vibration.
Conveyor track: wear-resistant and deformation-resistant to ensure efficient operation of the logistics system.
Other scenarios
Temporary facilities: scaffolding, construction platform, exhibition stand (surface anti-rust treatment required).
Agricultural facilities: greenhouse frame, farm fence support.
SS400 I-beam core advantages comparison
| Comparison items | SS400 I-beam | Ordinary angle steel/channel steel | High-strength alloy steel |
|---|---|---|---|
| Bending performance | Excellent (large moment of inertia of section) | Fair | Excellent (but high cost) |
| Weldability | Excellent (low carbon, no special process required) | Good | Preheating and post-weld treatment required |
| Applicable scenarios | Buildings, bridges, mechanical frames | Lightweight brackets, fences | Super high-rise buildings, heavy equipment |
Why choose us?
Complete specifications: The stock covers I10 to I40 and larger specifications (please consult for specific stock) to meet different load requirements.
Flexible length: Regular lengths (6 meters, 9 meters, 12 meters), non-fixed lengths or precision cutting services can also be provided according to customer needs.
Material guarantee: All I-beams are from China's first-tier large steel mills (such as Anshan Iron and Steel, Mashan Iron and Steel, Laiwu Iron and Steel, Jinxi, Rizhao, etc.), with stable and reliable quality and traceability.
Surface state: Hot-rolled black material (with oxide scale) and sandblasting/shot blasting are available.
As a classic choice in the structural field, I-beam SS400 (Q235B) has been verified by numerous projects for its reliability, economy and ease of use.
Lishengda is well aware of the importance of steel to the success of a project. We not only provide high-quality products that meet standards, but also strive to become your trusted supply chain partner, providing a full range of services from material selection consultation, accurate quotation, efficient processing to on-time delivery.
Choosing Lishengda, you are choosing:
Peace of mind: from a large factory, consistent quality, and quality assurance can be checked.
Easy to worry: complete specifications, sufficient inventory, and quick response.
Satisfied: transparent prices, professional services, worry-free processing and distribution.
Confidence: honest cooperation, win-win cooperation, and help projects succeed.
Act now to get your exclusive I-beam SS400 solution!
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Quotation Questions ◢
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Q.
What is the difference between SS400 and Q235B? Which one is better?
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Q.
What factors mainly determine the price of I-beam SS400?
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Q.
How to choose the appropriate I-beam specifications?
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Q.
What should be paid attention to when welding I-beam SS400?
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Q.
How long is the delivery time?
A.For regular specifications in stock, delivery can usually be arranged within 1-3 working days after payment. For special specifications or large-volume orders, it needs to be determined according to the production schedule and logistics of the steel plant. We will confirm the specific delivery date of I-beam SS400 with you as soon as possible and make every effort to coordinate and guarantee it.