The Fang Gang calculation formula is used to determine the theoretical weight of square steel bars. The formula is: side length (in mm) × 0.00785 = kg/m. This formula applies to similar shapes such as round steel, hexagonal steel, and octagonal steel. For reference, you can consult the national standard GB/T 702-2008, which outlines the dimensions, shape, weight, and allowable deviation for hot-rolled steel bars.
Here is a table showing the relationship between the side length, cross-sectional area, and theoretical weight for various square steel bars:
| Side Length (mm) | Cross Section Area (cm²) | Theoretical Weight (kg/m) |
|------------------|---------------------------|---------------------------|
| 5 | 0.25 | 0.196 |
| 6 | 0.36 | 0.283 |
| 7 | 0.49 | 0.385 |
| 8 | 0.64 | 0.502 |
| 9 | 0.81 | 0.636 |
| 10 | 1.00 | 0.785 |
| 11 | 1.21 | 0.95 |
| 12 | 1.44 | 1.13 |
| 13 | 1.69 | 1.33 |
| 14 | 1.96 | 1.54 |
| 15 | 2.25 | 1.77 |
| 16 | 2.56 | 2.01 |
| 17 | 2.89 | 2.27 |
| 18 | 3.24 | 2.54 |
| 19 | 3.61 | 2.82 |
| 20 | 4.00 | 3.14 |
| 21 | 4.41 | 3.46 |
| 22 | 4.84 | 3.80 |
| 24 | 5.76 | 4.52 |
| 25 | 6.25 | 4.91 |
| 26 | 6.76 | 5.30 |
| 28 | 7.84 | 6.15 |
| 30 | 9.00 | 7.06 |
| 32 | 10.24 | 8.04 |
| 34 | 11.56 | 9.07 |
| 36 | 12.96 | 10.17 |
| 38 | 14.44 | 11.24 |
| 40 | 16.00 | 12.56 |
| 42 | 17.64 | 13.85 |
| 45 | 20.25 | 15.90 |
| 48 | 23.04 | 18.09 |
| 50 | 25.00 | 19.63 |
| 53 | 28.09 | 22.05 |
| 56 | 31.36 | 24.61 |
| 60 | 36.00 | 28.26 |
| 63 | 39.69 | 31.16 |
| 65 | 42.25 | 33.17 |
| 70 | 49.00 | 38.49 |
| 75 | 56.25 | 44.16 |
| 80 | 64.00 | 50.24 |
| 85 | 72.25 | 56.72 |
| 90 | 81.00 | 63.59 |
| 95 | 90.25 | 70.85 |
| 100 | 100.00 | 78.50 |
**Notes:**
(1) Square steel with side lengths between 105–250 mm is not listed in the standard table. If needed, you can refer to multiples of the data from the table.
(2) The standard length of square steel varies depending on the type and size.
- **Ordinary steel**:
- Side length ≤25mm: 5–10m long
- Side length 26–50mm: 4–9m long
- Side length 53–110mm: 4–8m long
- Side length ≥120mm: 3–6m long
- **High-quality steel**: All sizes are typically 2–6m long.
- **Cut or double-length steel**: These are determined based on contract specifications.
This information is essential for engineers, fabricators, and construction professionals who need accurate weight calculations for square steel bars.
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