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The image below shows an important chart for calculating the weight of steel, which is crucial for various construction purposes where precise measurements are essential. Accurate steel weight calculations ensure the structural integrity and safety of constructions while preventing any issues related to overloading. By utilizing the weight formula for steel, we can avoid errors that may arise from physical measurements, thus reducing the risk of failure.
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**Table of Contents**
- Steel Bar Weight Chart
- Weight Chart of Bars per Bundle
- Steel Plate Weight Chart
- Steel Bar Weight Formula
- Steel Unit Weight Per Kg
- Factors Influencing Steel Beam Weight Calculation
- Steel Pipe Weight Formula
- Steel Bar Tolerance
- Different Types of Steel and Their Density
- Steel Weight in Feet
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### Calculating the Weight of Steel Bars and Plates Using Formulas
Below is a detailed table providing precise weight information for different steel bar sizes, which is very useful for practical applications.
**Steel Bar Weight Chart**
| Size (MM) | 8 | 10 | 12 | 16 |
|-----------|---------|---------|---------|---------|
| **Minimum (KG/M)** | 0.367 | 0.574 | 0.844 | 1.501 |
| **Average (KG/M)** | 0.395 | 0.617 | 0.888 | 1.58 |
| **Maximum (KG/M)** | 0.423 | 0.66 | 0.932 | 1.659 |
| **Range (KG/M)** | 0.375–0.400 | 0.580–0.620 | 0.850–0.910 | 1.510–1.600 |
| Size (MM) | 20 | 25 | 28 | 32 |
|-----------|---------|---------|---------|---------|
| **Minimum (KG/M)** | 2.396 | 3.734 | 4.685 | 6.121 |
| **Average (KG/M)** | 2.47 | 3.856 | 4.83 | 6.31 |
| **Maximum (KG/M)** | 2.544 | 3.964 | 4.975 | 6.499 |
| **Range (KG/M)** | 2.400–2.510 | 3.750–3.910 | 4.700–4.900 | 6.184–6.436 |
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**Weight Chart of Bars per Bundle**
| Steel Bar Size (MM) | 8 | 10 | 12 | 16 | 20 | 25 | 28 | 32 |
|---------------------|---------|---------|---------|---------|---------|---------|---------|---------|
| **Number of Bars per Bundle** | 10 | 7 | 5 | 3 | 2 | 1 | 1 | 1 |
| **Length of Each Bar (Meters)** | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| **Total Weight of Bundle (KG)** | 45 | 48.72 | 51 | 54.36 | 57.6 | 45 | 56.4 | 74.21 |
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**Steel Plate Weight Chart**
| Plate Thickness (MM) | 1.6 | 2 | 2.5 | 3 | 3.2 | 4 | 5 | 6 | 8 | 10 | 12.5 | 15 | 20 | 22.5 | 25 | 30 | 32 | 35 | 40 |
|----------------------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|---------|
| **Weight (KG/M²)** | 12.6 | 15.7 | 19.6 | 23.6 | 25.1 | 31.4 | 39.3 | 47.1 | 62.8 | 78.5 | 98.1 | 118 | 157 | 177 | 196 | 236 | 251 | 275 | 314 |
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### Understanding the Steel Bar Weight Formula
The weight of steel bars can be calculated using the following formula:
**Steel Bar Weight Formula:**
**Weight = D²/162**
Where:
- **D** = Diameter of the steel bar
- **162** = Constant value
#### Formula Derivation:
Consider:
- **Diameter = D**
- **Length = L**
Weight of Steel Bar (W) = Unit Weight of Steel Bar (γ) × Volume (V)
W = γ × V
W = πD²/4 × γ (Volume = πD²/4)
Density of steel = 7850 kg/m³
W = πD²/4 × 7850
Converting diameter from mm to m:
D² mm / 1000²
W = π/4 × D²/1000² × 7850
W = D²/162.28 kg/m
Thus, **W = D²/162 kg/m**
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### Steel Unit Weight Per Kg
| Size (MM) | 6 | 8 | 10 | 12 | 16 | 20 | 25 | 32 |
|-----------|---------|---------|---------|---------|---------|---------|---------|---------|
| **Weight (KG/M)** | 0.222 | 0.395 | 0.617 | 0.89 | 1.58 | 2.47 | 3.86 | 6.32 |
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### Factors Influencing Steel Beam Weight Calculation
1. **Beam Size and Shapes**:
- Dimensions such as thickness, width, and height
- Cross-sectional shapes like U-beams, H-beams, or I-beams
2. **Beam Length**:
- Longer beams weigh more if the cross-sectional area remains unchanged
3. **Steel Grade and Density**:
- Higher density steels result in heavier beams
- Different types of steel affect the weight significantly
4. **Additional Loads**:
- Dead loads include permanent, non-moving weights
- Live loads refer to temporary and varying weights
5. **Connections and Joints**:
- The number and type of joints also impact the overall weight
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### Steel Pipe Weight Formula
**Weight of Steel Pipes Formula**:
**W = 0.02466 × D² × L / 10202**
Where:
- **W** = Weight of steel pipe in kg/m
- **D** = Outer diameter of the steel pipe in mm
- **L** = Length of the steel pipe in meters
**Example**:
Consider a steel pipe with OD = 100 mm and length = 6 m
W = 0.02466 × 100² × 6 / 10202
W = 0.02466 × 10000 × 6 / 10202
W = 1480 / 10202
W = 0.145 kg/m
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### Steel Bar Tolerance
| Nominal Size (MM) | Over 10 up to 16 | Up to 10 | Over 16 |
|--------------------|------------------|----------|----------|
| **Tolerance on Batch** | ±5% | ±7% | ±3% |
| **Tolerance on Individual Samples** | -6% | -8% | -4% |
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### Steel Types and Their Density
| Steel Type | Carbon Steel | Tool Steel | Wrought Iron | Carbon Tool Steel | Cold-Drawn Steel |
|--------------------|--------------|------------|--------------|-------------------|------------------|
| **Density (kg/m³)** | 7840 | 7715 | 7750 | 7820 | 7830 |
| Steel Type | C1020 HR Steel | Pure Iron | Mild Steel | Stainless Steel |
|--------------------|----------------|-----------|------------|-----------------|
| **Density (kg/m³)** | 7850 | 7860 | 7870 | 8030 |
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### Steel Weight in Feet
| Size (MM) | 6 | 8 | 10 | 12 | 16 | 20 | 25 | 32 |
|-----------|---------|---------|---------|---------|---------|---------|---------|---------|
| **Weight (KG/Ft)** | 0.067 | 0.120 | 0.188 | 0.270 | 0.480 | 0.751 | 1.174 | 1.925 |
This comprehensive guide should help you understand how to calculate the weight of steel accurately for various applications.