Steel plate: thickness, mass and grades
Mass per square metre and design yield stress for hot-rolled structural plate to AS/NZS 3678.
| Thickness (mm) | Mass (kg/m²) | Grade 300 fy (MPa) | Grade 350 fy (MPa) |
|---|---|---|---|
| 3 | 23.55 | 320 | 360 |
| 4 | 31.40 | 320 | 360 |
| 5 | 39.25 | 320 | 360 |
| 6 | 47.10 | 320 | 360 |
| 8 | 62.80 | 320 | 360 |
| 10 | 78.50 | 310 | 360 |
| 12 | 94.20 | 310 | 360 |
| 16 | 125.60 | 300 | 350 |
| 20 | 157.00 | 300 | 350 |
| 25 | 196.25 | 280 | 340 |
| 28 | 219.80 | 280 | 340 |
| 32 | 251.20 | 280 | 340 |
| 36 | 282.60 | 280 | 340 |
| 40 | 314.00 | 280 | 340 |
| 45 | 353.25 | 280 | 340 |
| 50 | 392.50 | 280 | 340 |
| 60 | 471.00 | 270 | 340 |
| 70 | 549.50 | 270 | 340 |
| 80 | 628.00 | 270 | 340 |
| 90 | 706.50 | 260 | 330 |
| 100 | 785.00 | 260 | 330 |
Mass = 7.85 × t (kg/m² per mm). Grade 250 plate is also common for non-structural uses: fy = 280 (t ≤ 8), 260 (≤ 12), 250 (≤ 50), 240 (≤ 80), 230 (≤ 150) MPa. Check availability of particular thicknesses with your supplier. Use the weight calculator for plate pieces.