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Technical Specifications
Product Overview
Hot Rolled Steel Round Bar is manufactured from high-quality carbon steel through hot rolling process, providing excellent strength and ductility for general engineering applications. This versatile structural steel offers good weldability and machinability for a wide range of industrial uses.
Key Features:
- Excellent strength-to-weight ratio
- Good weldability and machinability
- Cost-effective solution for structural applications
- Wide range of sizes available
- Consistent mechanical properties
Manufacturing Process: Hot rolled from quality carbon steel billets using controlled rolling technology, ensuring uniform grain structure and consistent mechanical properties throughout the cross-section.
Applications: Construction and structural applications, machinery components, automotive parts, general fabrication, shafts and axles, bolts and fasteners, and general engineering applications requiring good strength and ductility.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A36 Requirement |
|---|---|---|---|---|
| Carbon (C) | - | 0.26 | 0.20 | ≤ 0.26 |
| Manganese (Mn) | 0.80 | 1.20 | 1.00 | 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) | - | 0.30 | 0.15 | ≤ 0.30 |
| Nickel (Ni) | - | 0.30 | 0.15 | ≤ 0.30 |
| Iron (Fe) | Balance | Balance | 97.5 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 400-550 MPa | 480 MPa | ASTM A370 | Room Temp |
| Yield Strength | 250 MPa min | 280 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) | - | 80-120 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 | 50-60 | 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 | 100-200 | nΩ·m | 20¡ãC | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | ¡ãC | - | Magnetic |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Diameter | 6mm - 300mm | Various | Yes | ±0.5mm to ±2mm |
| Length | 3m - 12m | 6m, 9m, 12m | Yes | +50mm/-0mm |
| Surface Finish | Hot Rolled, Peeled, Turned | Hot Rolled | Yes | Mill Scale |
| Straightness | Standard, Precision | Standard | Yes | 3mm/m max |
| End Condition | Plain Cut, Chamfered | Plain Cut | Yes | 90¡ã ± 2¡ã |
| Heat Treatment | As Rolled, Normalized | As Rolled | Yes | Per specification |
| Standards Compliance | ASTM A36, A572, EN S235 | ASTM A36 | Multiple | Full compliance |
| Testing | Chemical, Mechanical | Chemical | Yes | Per 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 熱間圧延鋼丸棒
Controlled Hot Rolling Process
The precise temperature-controlled hot rolling process ensures optimal grain structure and mechanical properties throughout the bar. This results in consistent material characteristics and superior strength compared to cold-rolled alternatives.
Uniform Surface Quality
Hot rolling at high temperatures produces bars with smooth, uniform surface finish and reduced internal stresses. This manufacturing method minimizes surface defects and ensures excellent roundness tolerance across the entire length.
Enhanced Material Workability
The hot rolling process creates a refined microstructure that provides excellent ductility and formability. This makes the bars ideal for subsequent machining, welding, and forming operations while maintaining structural integrity.
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