Carbon steel I-beams, commonly referred to as "I Beams" or "Universal Beams," are essential structural components in modern construction. Their distinctive "I" shape enables excellent strength-to-weight performance, making them ideal for supporting heavy loads in both horizontal and vertical applications.
Q235 structural carbon steel, known for its stable mechanical properties and outstanding weldability, is one of the most widely used materials for manufacturing I Beams in the global market.
1. Types of Carbon Steel I Beams
Carbon steel I beams are available in two main configurations:
Wide-Flange Beams (H-Beams / W-Beams)
Also known as H-Beams, these beams feature non-tapered flanges, resulting in a broad profile with enhanced horizontal load capacity.
They are ideal for:
Skyscraper frameworks
House beams and floor systems
Bridge construction
Trailers and platforms
Heavy industrial structures
Standard American S Beams (Junior Beams)
S-Beams are designed with tapered flanges, providing higher strength when loads concentrate directly on the flanges.
Common uses include:
Machine tool beds
Crane beams and hoists
Garage cart beams
Industrial equipment frames
These configurations allow engineers to select the right profile according to load direction, bending requirements, and structural layout.
2. Standard Dimensions & Weight Data
Below are the common Q235 structural carbon steel I-Beam specifications widely used in global construction:
| Height × Width (mm) | Web Thickness (mm) | Flange Thickness (mm) | Weight (kg/m) |
|---|---|---|---|
| 150 × 100 | 6 | 9 | 21.4 |
| 200 × 150 | 6 | 9 | 31.2 |
| 250 × 175 | 7 | 11 | 44.1 |
| 300 × 200 | 8 | 12 | 57.3 |
| 350 × 250 | 9 | 14 | 79.7 |
| 400 × 300 | 10 | 16 | 107.3 |
| 450 × 300 | 11 | 18 | 124 |
| 500 × 300 | 11 | 15 / 18 | 115 / 129.1 |
| 506 × 201 | 19 | 103.1 | 101 |
| 600 × 200 | 10 / 11 / 12 | 15 / 17 / 20 | 95.2 / 106.1 / 120.3 |
| 700 × 300 | 13 | 20 / 24 | 166 / 185 |
| 800 × 300 | 14 | 22 / 26 | 191 / 210 |
| 900 × 300 | – | – | – |
These sizes cover most structural applications, from residential housing to industrial buildings and long-span projects.
3. Material Advantages of Q235 Structural Carbon Steel
Q235 steel offers:
Excellent weldability for onsite fabrication
Good plasticity and toughness under dynamic loads
Reliable strength suitable for beams, columns, and heavy frames
Cost-effective performance compared with alloy structural steels
Its combination of strength and affordability makes it the preferred material for large-scale construction projects worldwide.
4. Typical Applications of Q235 Carbon Steel I Beams
These beams are widely used in:
Steel structure engineering
Building frames, floors, and roofs
Bridges and highway structures
Transmission towers
Automotive chassis and parts
Equipment supports and crane beams
Platforms, walkways, and loading systems
Whether used independently or combined with H-beams and other steel sections, Q235 I beams provide dependable load-bearing performance in diverse engineering conditions.