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Technical Specifications
Product Overview
Hot Rolled Steel Junior Beam is a structural steel section manufactured through hot rolling process, providing excellent strength-to-weight ratio for construction and engineering applications. These I-beams feature a compact cross-section with parallel flanges and are ideal for medium-duty structural applications.
Key Features:
- High strength-to-weight ratio for efficient structural design
- Excellent weldability and machinability
- Cost-effective solution for medium-span applications
- Uniform cross-section with parallel flanges
- Suitable for both bolted and welded connections
Manufacturing Process: Hot rolled from quality carbon steel billets using precision rolling mills, ensuring consistent dimensional accuracy and mechanical properties throughout the length.
Applications: Building construction, industrial structures, mezzanine floors, support beams, framework construction, machinery bases, and general structural engineering applications where medium load capacity is required.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A36 Requirement |
|---|---|---|---|---|
| Carbon (C) | - | 0.26 | 0.18 | ≤ 0.26 |
| Manganese (Mn) | 0.80 | 1.20 | 0.95 | 0.80-1.20 |
| Silicon (Si) | 0.15 | 0.40 | 0.25 | 0.15-0.40 |
| Phosphorus (P) | - | 0.040 | 0.025 | ≤ 0.040 |
| Sulfur (S) | - | 0.050 | 0.030 | ≤ 0.050 |
| Copper (Cu) | - | 0.20 | 0.12 | ≤ 0.20 |
| Chromium (Cr) | - | 0.15 | 0.08 | ≤ 0.15 |
| Nickel (Ni) | - | 0.15 | 0.08 | ≤ 0.15 |
| Iron (Fe) | Balance | Balance | 98.2 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 400-550 MPa | 485 MPa | ASTM A370 | Room Temp |
| Yield Strength | 250 MPa min | 275 MPa | ASTM A370 | Room Temp |
| Elongation | 20% min | 25% | ASTM A370 | Room Temp |
| Hardness (Brinell) | - | 140-180 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | - | 75-85 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 200 GPa | ASTM E111 | Room Temp |
| Impact Energy (Charpy V) | - | 80+ J | ASTM E23 | Room Temp |
🔬 Physical Properties
| Property | Value | Unit | Temperature | Test Standard |
|---|---|---|---|---|
| Density | 7.85 | g/cm3 | 20°C | ASTM B311 |
| Melting Point | 1425-1540 | °C | - | DSC Analysis |
| Thermal Conductivity | 50.2 | W/m·K | 100°C | ASTM E1461 |
| Specific Heat | 434 | J/kg·K | 0-100°C | ASTM C351 |
| Linear Expansion | 11.7 | μm/m·K | 0-100°C | ASTM E228 |
| Electrical Resistivity | 170 | n|°¤m | 20°C | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | °C | - | Ferromagnetic |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Depth (Height) | 100mm - 610mm | Various | Yes | ±3mm |
| Flange Width | 55mm - 229mm | Various | Yes | ±2mm |
| Web Thickness | 4.3mm - 19.1mm | Various | Limited | ±0.5mm |
| Flange Thickness | 7.2mm - 27.7mm | Various | Limited | ±0.5mm |
| Length | 6m - 18m | 12m | Yes | +100mm/-0mm |
| Surface Finish | Mill Scale, Shot Blast | Mill Scale | Yes | SSPC-SP standards |
| End Preparation | Square Cut, Beveled | Square Cut | Yes | ±2° |
| Standards Compliance | ASTM A36, A992, A572 | A36 | Multiple | Full compliance |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Loose | Bundles | Custom | Export standard |
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Our Advantages in Processing 熱間圧延鋼ジュニアビーム
Enhanced Structural Strength
The hot rolling process aligns the steel's grain structure during high-temperature forming, resulting in superior mechanical properties and enhanced load-bearing capacity compared to cold-formed alternatives. This creates a more uniform and robust internal structure.
Precise Dimensional Control
Hot rolling at elevated temperatures allows for precise control over the beam's final dimensions and profile geometry. The process ensures consistent cross-sectional properties throughout the length, maintaining tight tolerances for construction specifications.
Improved Material Ductility
The elevated temperatures during hot rolling increase the steel's malleability, resulting in better ductility and reduced internal stresses in the final product. This enhances the beam's ability to withstand dynamic loads and structural deformation.
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