SS400 is one of the most widely utilized carbon structural steel grades, defined under the JIS G3101 standard. Known for its versatility and cost-effectiveness, it is the quintessential “mild steel” used in global construction and engineering projects. Whether you are designing bridges, ships, or industrial machinery, understanding the technical specifications of SS400 is essential for structural integrity.
Key Characteristics of SS400 Steel
The primary appeal of SS400 lies in its balanced mechanical properties. Unlike higher-carbon steels, SS400 offers excellent weldability and machinability, making it easy to fabricate into complex shapes. Because it lacks a specific carbon content requirement in the JIS standard, the focus remains on its tensile strength and yield point.
| Property | Value (Metric) |
| Tensile Strength | 400 – 510 MPa |
| Yield Strength | ≥ 245 MPa (Thickness ≤ 16mm) |
| Elongation | 17% – 23% (Varies by thickness) |
| Standard | JIS G3101 |
Chemical Composition and Quality
While the JIS G3101 standard focuses on physical performance, the chemical makeup is controlled to ensure reliability. Phosphorus and sulfur levels are kept low to prevent brittleness, ensuring the steel remains durable under stress. For high-quality sourcing,,you can purchase certified materials that meet these stringent international standards from HNS Steel.
Common Applications of SS400
Due to its stable performance, SS400 steel is a staple in the following sectors:
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Infrastructure: Used in the skeletal structures of buildings and bridges.
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Automotive: Manufacturing of non-critical structural components.
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Energy: Base plates and support frames for oil and gas equipment.
When compared to other international grades like ASTM A36, SS400 is often preferred in Asian and Middle Eastern markets for its consistent quality. For more technical comparisons on carbon structural steel, professional databases offer extensive data on how these grades perform under varied environmental conditions.
In conclusion, SS400 steel remains a top choice for developers seeking a reliable, general-purpose structural material that balances strength with ease of use.
