Description
JIS G3101 General structure steel
JIS G3101 is a Japanese material standard that specifies hot-rolled general structural steel used in construction, bridges, ships, and other structural applications. This standard includes different steel grades, such as SS400, SS490, and SS540, which offer varying strength levels for different structural requirements.
Key Steel Grades Under JIS G3101
- SS400 – The most commonly used grade, offering good weldability and machinability.
- SS490 – Higher strength compared to SS400, suitable for structural applications requiring greater load-bearing capacity.
- SS540 – A high-strength steel grade used for heavy structural components.
Dimensions
- Length: 4mm – 350mm
- Width: 1000mm – 4000mm
- Thickness: 1800mm – 12000mm
JIS G3101 SS400, SS490, and SS540 Chemical Composition (Typical %)
| Grade | C (Max) | Si (Max) | Mn (Max) | P (Max) | S (Max) |
|---|---|---|---|---|---|
| SS400 | 0.050 | 0.050 | 0.050 | 0.050 | 0.050 |
| SS490 | 0.020 | 0.030 | 0.020 | 0.030 | 0.030 |
| SS540 | 0.030 | 0.040 | 0.030 | 0.040 | 0.040 |
JIS G3101 SS400, SS490, and SS540 Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| SS400 | ≥ 245 (for thickness ≤ 16mm) | 400 – 510 | 17 – 21 |
| SS490 | ≥ 275 | 490 – 610 | 15 – 19 |
| SS540 | ≥ 400 | 540 – 700 | 12 – 17 |
Applications
- Building structures
- Bridges and engineering structures
- Shipbuilding
- General welded and bolted structures
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