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Technical Specifications
Product Overview
1045 Cold Rolled Round Bar is a medium carbon steel with excellent strength and wear resistance properties. This grade offers good machinability and is widely used in applications requiring moderate strength and toughness. The cold rolling process provides improved surface finish, dimensional accuracy, and enhanced mechanical properties compared to hot rolled material.
Key Features:
- Medium carbon content providing good strength-to-weight ratio
- Excellent machinability and weldability
- Good wear resistance and durability
- Superior surface finish from cold rolling process
- Heat treatable for enhanced properties
- Cost-effective solution for structural applications
Manufacturing Process: Cold rolled from hot rolled billets through precision rolling mills, ensuring consistent dimensional accuracy and improved surface quality. Optional heat treatment available for specific property requirements.
Applications: Machinery components, shafts, axles, bolts, studs, gears, automotive parts, construction hardware, agricultural equipment, and general engineering applications requiring moderate strength and good machinability.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A108 Requirement |
|---|---|---|---|---|
| Carbon (C) | 0.43 | 0.50 | 0.46 | 0.43-0.50 |
| Manganese (Mn) | 0.60 | 0.90 | 0.75 | 0.60-0.90 |
| Phosphorus (P) | - | 0.040 | 0.025 | ≤ 0.040 |
| Sulfur (S) | - | 0.050 | 0.030 | ≤ 0.050 |
| Silicon (Si) | - | 0.40 | 0.25 | ≤ 0.40 |
| Chromium (Cr) | - | 0.25 | 0.15 | ≤ 0.25 |
| Nickel (Ni) | - | 0.25 | 0.15 | ≤ 0.25 |
| Molybdenum (Mo) | - | 0.06 | 0.03 | ≤ 0.06 |
| Iron (Fe) | Balance | Balance | 98.1 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 625 MPa min | 690 MPa | ASTM A370 | Room Temp |
| Yield Strength (0.2%) | 415 MPa min | 450 MPa | ASTM A370 | Room Temp |
| Elongation | 12% min | 16% | ASTM A370 | Room Temp |
| Reduction of Area | 35% min | 40% | ASTM A370 | Room Temp |
| Hardness (Brinell) | 187-229 HB | 200 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell C) | - | 20 HRC | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 205 GPa | ASTM E111 | Room Temp |
| Impact Energy (Charpy V) | - | 54 J | ASTM E23 | Room Temp |
🔬 Physical Properties
| Property | Value | Unit | Temperature | Test Standard |
|---|---|---|---|---|
| Density | 7.87 | g/cm3 | 20¡ãC | ASTM B311 |
| Melting Point | 1470-1520 | ¡ãC | - | DSC Analysis |
| Thermal Conductivity | 49.8 | W/m·K | 100¡ãC | ASTM E1461 |
| Specific Heat | 486 | J/kg·K | 0-100¡ãC | ASTM C351 |
| Linear Expansion | 12.2 | μm/m·K | 0-100¡ãC | ASTM E228 |
| Electrical Resistivity | 162 | nΩ·m | 20¡ãC | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | Ferromagnetic |
| Curie Temperature | 770 | ¡ãC | - | Magnetic transition |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Diameter | 6mm - 300mm | Various | Yes | ±0.13mm |
| Length | 1m - 12m | 6m | Yes | +25mm/-0mm |
| Surface Finish | Cold Rolled, Turned, Ground | Cold Rolled | Yes | Ra ≤ 1.6μm |
| Straightness | 0.5mm/m max | Standard | Precision | ASTM A108 |
| End Condition | Saw Cut, Machined | Saw Cut | Yes | Square ±1¡ã |
| Heat Treatment | Annealed, Normalized | Cold Rolled | Yes | Customer spec |
| Standards Compliance | ASTM A108, SAE 1045 | ASTM A108 | Multiple | Full compliance |
| Certification | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Test Certificate | Chemical, Mechanical | Standard | Extended | Per standard |
| Packaging | Bundles, Crates, Pallets | Bundles | Custom | Export standard |
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Our Advantages in Processing 1045 Barra Redonda Laminada a Frio
Precision Cold Rolling Process
Advanced cold rolling technology ensures superior dimensional accuracy and consistently tight tolerances throughout the bar length. This process creates an exceptionally smooth surface finish while improving the material's mechanical properties through work hardening.
Enhanced Surface Quality
The cold rolling manufacturing process produces bars with excellent surface smoothness and roundness, minimizing the need for additional finishing operations. This results in reduced machining time and cost for end-users.
Improved Material Strength
Cold rolling refines the steel's grain structure, significantly increasing its yield strength and hardness compared to hot-rolled alternatives. This manufacturing method delivers superior mechanical properties without requiring additional heat treatment.
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