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JIS G3136 SN400 (A, B, C) Hot Rolled Structural H Steel Beam for Building Structure
Reliable, Versatile, and Globally Recognized Japanese Standard Steel Profiles.
Royal Steel Group offers professional, customized steel services to meet your project's material, size, and any other detailed requirements.
We hold multiple industry certifications, including ISO and CE, and can provide inspection reports from third-party testing agencies such as SGS and BV.
As an experienced global exporter, we are familiar with international trade rules, customs requirements, and shipping methods, enabling us to provide reliable, one-stop steel supply services to clients worldwide.
JIS G3136 SN400 series is specifically engineered for building structures. Unlike standard SS400 steel, the SN Grade (Steels for New structure) is designed with strict control over yield strength, chemistry, and weldability to ensure superior performance in seismic (earthquake-resistant) applications.
1. Chemical Composition (Heat Analysis)
Solving Pain Points: Strict control of Carbon Equivalent (Ceq) and impurities (P, S) to ensure excellent weldability and prevent cracking.
| Grade | C (max) | Si (max) | Mn | P (max) | S (max) | Ceq* (max) |
| SN400A | 0.24% | - | - | 0.05% | 0.05% | - |
| SN400B | 0.20% | 0.35% | 0.60-1.40% | 0.03% | 0.02% | 0.36% |
| SN400C | 0.20% | 0.35% | 0.60-1.40% | 0.02% | 0.01% | 0.36% |
Formula: Ceq = C + Mn/6 + Si/24 + Ni/40 + Cr/5 + Mo/4 + V/14
2. Mechanical Properties
Solving Pain Points: Guaranteed Yield Ratio ($\le 80\%$) to ensure high energy absorption during seismic events.
| Grade | Yield Point (MPa) | Tensile Strength (MPa) | Yield Ratio (max) | Elongation (min) | Charpy V-Notch Impact (0℃) |
| SN400A | ≥ 235 | 400 - 510 | - | ≥ 18\% | Not Required |
| SN400B | 235 - 355 | 400 - 510 | 80% | ≥ 18\% | ≥ 27J |
| SN400C | 235 - 355 | 400 - 510 | 80% | ≥ 22\% | ≥ 27J |
| Section Size (H×B) | Web Thickness (t1) | Flange Thickness (t2) | Unit Weight (kg/m) |
| 100 x 100 mm | 6 mm | 8 mm | 16.9 |
| 200 x 200 mm | 8 mm | 12 mm | 49.9 |
| 400 x 200 mm | 8 mm | 13 mm | 66 |
| 700 x 300 mm | 13 mm | 24 mm | 185 |
| 912 x 302 mm | 18 mm | 34 mm | 286 |
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Building systems: High rise building frames Commercial steel systems.
Structure: Bridges, highway bearers, railway brackets.
Manufacturing: Workshop factory, plant platforms and machine foundations.
Power: Oil & Gas pipe racks and solar mounting systems.
For the modern building, safety is essential. JIS G3136 SN400 offers:
Tight Yield Range: Expected structural performance.
Enhanced Weldability: Reduced carbon content leads to less preheating.
Lamellar Tearing Resistance: Important for heavy load welded joints. (Class C)
As a global steel supplier, we assure the stability of your supply chain and the technical competence of your team. Our products are tested to international project requirements for projects in South East Asia, the Middle East and the Americas.
Full product line: Primarily uses SN400B steel, with a small amount of the special steel SN400C (excellent Z-direction performance) used for critical structural nodes.
Quality Transparency: All batches come with a unique Material Certificate of Conformity (MTC) conforming to EN 10204 3.1 standards.
Third-Party Inspection: We collaborate with SGS, BV, and Intertek for third-party inspections (ultrasonic testing, impact testing, chemical composition analysis).
Seismic Performance: We have established long-term and stable supply relationships with high-rise buildings in earthquake-prone regions (Japan, Southeast Asia, Latin America).
Bundling Method: Bundles are secured with high-strength steel straps, each equipped with 2-4 lifting rings for easy port loading and unloading.
Surface Treatment: Black (rolled state), shop primer (rust-proof coating), galvanized.
End Face Marking: Each beam is color-coded and marked with furnace number, grade, and dimensions for complete traceability.
Flexible Shipping Options:
Containers (20GP/40GP): Suitable for products not exceeding 5.8 meters or 11.8 meters in length.
Loose Cargo: Ideal for large-volume orders and products with a fixed length of 12 meters.
We have established stable partnerships with top international shipping companies such as Maersk (MSK), MSC, and COSCO, enabling us to provide fast, reliable, and cost-effective global logistics services.
Our product manufacturing and delivery fully comply with the ISO9001 quality management system. From raw material packaging to finished product transportation, every step is strictly controlled to ensure the safe and timely delivery of your H-beams, providing reliable and worry-free support for your projects.
Contact us today for a Quick Quote or the Full Dimension Chart!
Please visit our official website www.royalsteelgroup.com or contact our customer service team ↓. We look forward to cooperating with you to build high-quality engineering projects.
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Kangsheng development industry zone,
Wuqing district, Tianjin city, China.
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