JIS G 3101 is the Japanese Industrial Standard for Rolled Steel for General Structure. Here’s a detailed breakdown:
Grade Classification:
| Grade | Yield Point (N/mm²) | Tensile Strength (N/mm²) | Elongation (%) |
|---|---|---|---|
| SS330 | ≥215 | 330-430 | ≥21 |
| SS400 | ≥245 | 400-510 | ≥21 |
| SS490 | ≥275 | 490-610 | ≥19 |
| SS540 | ≥390 | 540-660 | ≥17 |
Chemical Composition (maximum %):
| Grade | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| SS330 | 0.20 | – | 0.90 | 0.040 | 0.040 |
| SS400 | 0.22 | – | 1.40 | 0.040 | 0.040 |
| SS490 | 0.22 | 0.55 | 1.60 | 0.040 | 0.040 |
| SS540 | 0.25 | 0.55 | 1.60 | 0.040 | 0.040 |
Thickness Tolerances:
| Thickness (mm) | Tolerance (mm) |
|---|---|
| ≤5 | ±0.4 |
| >5 to ≤8 | ±0.5 |
| >8 to ≤13 | ±0.6 |
| >13 to ≤20 | ±0.8 |
| >20 to ≤30 | ±0.9 |
| >30 to ≤50 | ±1.0 |
Key Requirements:
- Material must be free from harmful defects
- Bend test requirements vary by thickness
- Surface quality requirements specified
- Heat treatment conditions when applicable
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