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Technical Specifications
Product Overview
Hot Rolled Steel Flat 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 weldability, machinability, and cost-effectiveness for a wide range of industrial uses.
Key Features:
- Excellent strength-to-weight ratio
- Good weldability and machinability
- Cost-effective structural material
- Wide range of sizes available
- Suitable for various fabrication processes
Manufacturing Process: Hot rolled through precision rolling mills at temperatures above recrystallization temperature, ensuring uniform mechanical properties and dimensional accuracy.
Applications: Structural framework, machine bases, brackets, supports, general fabrication, construction projects, agricultural equipment, and industrial machinery components.
🧪 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) | - | 0.30 | 0.15 | ≤ 0.30 |
| Nickel (Ni) | - | 0.30 | 0.15 | ≤ 0.30 |
| 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) | - | 145 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | - | 78 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 Size | Custom Available | Tolerance |
|---|---|---|---|---|
| Width | 10mm - 300mm | Various | Yes | ±1.0mm |
| Thickness | 3mm - 100mm | Various | Yes | ±0.5mm |
| Length | 3m - 12m | 6m | Yes | +50mm/-0mm |
| Surface Finish | Hot Rolled, Pickled | Hot Rolled | Yes | Mill Scale |
| Edge Condition | Mill Edge, Slit Edge | Mill Edge | Both | ASTM standard |
| Straightness | Standard, Precision | Standard | Yes | 5mm/m max |
| Standards Compliance | ASTM A36, A572, EN S235 | A36 | Multiple | Full compliance |
| Grade Options | A36, A572 Gr50, S235JR | A36 | Yes | Certified |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Pallets, Containers | Bundles | Custom | Export standard |
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Our Advantages in Processing เหล็กแผ่นรีดร้อน
High Temperature Rolling Process
Manufacturing above recrystallization temperature (typically >900°C) enables optimal material flow and formability, resulting in consistent molecular structure throughout the bar and superior mechanical properties with minimal internal stress.
Efficient Shape Formation
The hot rolling process allows for precise dimensional control and efficient production of flat rectangular profiles, reducing manufacturing steps and material waste while ensuring uniform thickness and width across the entire length.
Enhanced Surface Quality
Hot rolling at elevated temperatures eliminates surface defects and creates a smooth finish directly during the manufacturing process, reducing the need for secondary finishing operations and lowering overall production costs.
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