How to Calculate the Weight of Rectangular Hollow Sections (RHS)

How to Calculate the Weight of Rectangular Hollow Sections (RHS)

Rectangular Hollow Sections (RHS) are widely used in construction, manufacturing, and structural applications due to their excellent strength-to-weight ratio and aesthetic appeal. Accurately calculating the weight of RHS is essential for material estimation, cost control, and engineering design. As a trusted supplier, Ruixiang Steel provides reliable RHS products and practical guidance to help customers determine weights efficiently.

Understanding RHS Dimensions
RHS is defined by its external dimensions and wall thickness. Standard notation includes:

Height (H) and Width (W) in millimeters or inches

Wall Thickness (T) in millimeters or inches

Length (L) typically in meters or feet

For example, an RHS 100×50×4mm has an external height of 100mm, width of 50mm, and 4mm wall thickness.

Basic Weight Calculation Formula
The fundamental formula for calculating RHS weight is:

Weight = Volume × Density

For steel RHS, the formula expands to:

Weight (kg) = [2 × (H + W) × T × L × ρ] ÷ 1,000,000

Where:

H = Height (mm)

W = Width (mm)

T = Wall Thickness (mm)

L = Length (mm)

ρ = Steel Density (typically 7.85 g/cm³ or 7850 kg/m³)

Practical Calculation Example
Let's calculate the weight of RHS 100×50×4mm with 6-meter length:

Weight = [2 × (100 + 50) × 4 × 6000 × 7.85] ÷ 1,000,000
= [2 × 150 × 4 × 6000 × 7.85] ÷ 1,000,000
= [56,520,000] ÷ 1,000,000 = 56.52 kg

Simplified Calculation Method
For quick estimates, use this simplified approach:

Weight (kg/m) = [2 × (H + W) × T × 7.85] ÷ 1000

Using our example:
Weight per meter = [2 × (100 + 50) × 4 × 7.85] ÷ 1000
= [2 × 150 × 4 × 7.85] ÷ 1000 = 9.42 kg/m

Total weight = 9.42 kg/m × 6m = 56.52 kg

Factors Affecting Accuracy
Several factors can influence actual RHS weight:

Material density variations (different steel grades)

Manufacturing tolerances in dimensions

Corner radii in RHS profiles

Surface treatments (galvanizing adds 3-5% weight)

Ruixiang Steel's Support Services
At Ruixiang Steel, we understand that accurate weight calculations are crucial for project success. We provide:

Detailed technical specifications for all our RHS products

Custom calculation tools and reference charts

Expert consultation for complex projects

Certified material test certificates ensuring quality compliance

Practical Applications
Weight calculation knowledge helps in:

Structural design and load calculations

Transportation planning and logistics

Cost estimation and budgeting

Inventory management and material planning

Conclusion
Mastering RHS weight calculations enables better project planning and cost control. While manual calculations provide good estimates, always verify with manufacturer specifications for critical applications. Ruixiang Steel offers comprehensive technical support to ensure our customers get accurate information for their RHS requirements, contributing to successful project outcomes.