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- July 2, 2025
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Bright Steel Bar Specification
Bright steel bars are cold-finished steel products known for their enhanced surface finish, tighter dimensional tolerances, and improved mechanical properties. These bars are widely used in automotive, construction, engineering, and manufacturing industries due to their precision and strength.
📌 What is a Bright Steel Bar?
Bright steel bars are produced through cold drawing, peeling, or grinding processes that give them a bright, smooth surface finish compared to hot-rolled steel bars. The improved finish and mechanical characteristics make them suitable for applications requiring high dimensional accuracy and aesthetic appeal.
🏗️ Applications of Bright Steel Bars
Bright bars are used in various industries, including:
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Automotive parts – shafts, gears, bolts, and fasteners
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Construction – support bars and structural components
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Machinery manufacturing
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Furniture & appliances – frames and decorative elements
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Railways and transport equipment
🔍 Bright Steel Bar Specifications
Below is a detailed breakdown of typical bright bar specifications:
✅ Material Grades Available
| Standard | Grade | Description |
|---|---|---|
| EN | EN8, EN9, EN24, EN31 | Medium carbon, high tensile strength |
| AISI/SAE | 1018, 1045, 4140, 4340 | Carbon and alloy steels |
| IS | IS 2062, IS 2830 | Indian standards for structural use |
✅ Sizes and Tolerances
| Type | Diameter Range | Tolerances (ISO h9/h11) |
|---|---|---|
| Round Bars | 3 mm – 100 mm | ±0.02 mm to ±0.1 mm |
| Square Bars | 6 mm – 100 mm | As per customer spec |
| Hex Bars | 6 mm – 80 mm | As per DIN/ASTM norms |
✅ Surface Finish
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Smooth, mirror-like finish
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Free from scale or rust
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Ra value as low as 0.2 µm (for polished bars)
✅ Lengths
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Standard: 3 – 6 meters
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Custom cut lengths available on request
✅ Shapes Available
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Round Bright Bars
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Square Bright Bars
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Flat Bright Bars
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Hexagonal Bright Bars
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Rectangular Bright Bars
⚙️ Mechanical Properties (Typical)
| Property | Value (EN8 Bright Bar as example) |
|---|---|
| Tensile Strength | 550 – 700 MPa |
| Yield Strength | 280 – 360 MPa |
| Elongation | 13 – 16% |
| Hardness | 180 – 230 BHN |
Note: Mechanical properties may vary with grade and treatment.
🧪 Chemical Composition (EN8 Example)
| Element | % Composition |
|---|---|
| Carbon (C) | 0.36 – 0.44% |
| Manganese (Mn) | 0.60 – 1.00% |
| Silicon (Si) | ≤ 0.05% |
| Sulfur (S) | ≤ 0.05% |
| Phosphorus (P) | ≤ 0.05% |
📦 Supply Condition
Bright bars can be supplied in:
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Cold drawn / Peeled / Polished
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Normalized
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Annealed
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Quenched and Tempered (Q&T)
✅ Advantages of Bright Bars
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High dimensional accuracy
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Better surface finish
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Improved machinability
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High tensile and yield strength
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Custom shapes and sizes available
🔗 Related Product Pages
📞 Call to Action
Looking for a reliable Bright Steel Bar Supplier in India?
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