Fang Gang Calculation Formula
The theoretical weight of square steel can be calculated using the formula:
**Side length (mm) × 0.00785 = kg/m**
This formula applies to similar bars such as round steel, hexagonal steel, and octagonal steel. For detailed specifications, refer to the national standard **GB/T 702-2008**, which outlines the size, shape, weight, and allowable deviation for hot-rolled steel bars. Below is a table showing the theoretical weight of square steel based on side length:
| 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 calculate the values by multiplying the data from the table accordingly.
(2) Standard lengths vary depending on the type of steel:
- **Ordinary steel**:
- Side length ≤25mm: 5–10m
- Side length 26–50mm: 4–9m
- Side length 53–110mm: 4–8m
- Side length ≥120mm: 3–6m
- **High-quality steel**: All sizes are typically 2–6m long.
- **Cut length**: Determined by the contract.
- **Doubler length**: Also determined by the contract.
This formula and table provide a practical reference for calculating the weight of square steel, ensuring accurate material estimation for construction or manufacturing projects.
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