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Technical Specifications
Product Overview
Hot Rolled Steel Square Bar is manufactured from high-quality carbon steel through hot rolling process, providing excellent strength and versatility for structural and general engineering applications. This product offers good machinability and weldability characteristics suitable for a wide range of industrial uses.
Key Features:
- High strength-to-weight ratio for structural applications
- Excellent weldability and machinability
- Cost-effective solution for general construction
- Good formability for fabrication work
- Consistent dimensional accuracy and surface quality
Manufacturing Process: Hot rolled from quality steel billets using precision rolling mills, ensuring uniform cross-section and consistent mechanical properties throughout the length.
Applications: Structural frameworks, machine components, support brackets, construction projects, general fabrication, agricultural equipment, automotive components, and industrial machinery manufacturing.
🧪 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 | 0.15 | ≤ 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¡ãC | ASTM B311 |
| Melting Point | 1510-1540 | ¡ãC | - | DSC Analysis |
| Thermal Conductivity | 50.2 | W/m·K | 100¡ãC | ASTM E1461 |
| Specific Heat | 460 | J/kg·K | 0-100¡ãC | ASTM C351 |
| Linear Expansion | 11.7 | μm/m·K | 0-100¡ãC | ASTM E228 |
| Electrical Resistivity | 170 | nΩ·m | 20¡ãC | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | ¡ãC | - | Ferromagnetic |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Square Size | 6mm - 200mm | Various | Yes | ±0.5mm |
| Length | 3m - 12m | 6m | Yes | +50mm/-0mm |
| Corner Radius | R2 - R8 | R3 | Yes | ±0.2mm |
| Surface Finish | Hot Rolled, Pickled | Hot Rolled | Yes | Ra ≤ 12.5μm |
| Straightness | - | Standard | Precision | ≤ 3mm/m |
| End Condition | Sawn, Machined | Sawn | Yes | Square cut ±1¡ã |
| Standards Compliance | ASTM A36, A572, JIS SS400 | A36 | Multiple | Full compliance |
| Heat Treatment | Hot Rolled, Normalized | Hot Rolled | Yes | Standard |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Loose, Containers | Bundles | Custom | Export standard |
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Our Advantages in Processing บาร์เหล็กกล้าสี่เหลี่ยมรีดร้อน
High Temperature Rolling Process
The hot rolling process at elevated temperatures above recrystallization point allows for optimal material formability and reduced energy requirements, resulting in more efficient production and better overall material properties.
Uniform Shape Formation
The controlled rolling process ensures precise square geometry formation throughout the length of the bar, maintaining consistent dimensional accuracy and structural integrity for reliable engineering applications.
Enhanced Material Strength
Hot rolling refines the steel's grain structure during the forming process, creating a more homogeneous material composition that enhances mechanical properties and improves overall structural performance.
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