Mild Steel Bars are round, flat, square, or hexagonal steel bars made from low-carbon steel (typically around 0.15–0.25% carbon content). They are ductile, weldable, and widely used in construction and fabrication applications.
Key Characteristics of Mild Steel Bars
| Property | Description |
| Carbon Content | ~0.15–0.25% |
| Tensile Strength | ~400–550 MPa |
| Yield Strength | ~250 MPa |
| Ductility | High (elongation up to 25%) |
| Weldability | Excellent |
| Machinability | Good |
| Corrosion Resistance | Low (usually requires coating or painting) |
Manufacturing Process
- Steelmaking (Basic Oxygen Furnace or Electric Arc Furnace)
- Casting (Steel billets or blooms)
- Hot Rolling (Bars shaped through rolling mills)
- Cutting (To desired lengths)
- Optional surface treatment (pickling, galvanizing, or painting
Applications of MS Bars
| Sector | Common Uses |
| Construction | Fencing, gates, scaffolding, grillwork |
| Structural | Framework for sheds, warehouses, small buildings |
| Fabrication | Furniture, machinery bases, frames |
| Automotive | Brackets, supports, minor chassis parts |
| Agriculture | Ploughs, tillers, irrigation structures |
Advantages of Mild Steel Bars
- Cost-effective and widely available
- Easy to weld, cut, and bend
- High ductility allows deformation without fracture
- Versatile for structural and non-structural use
Limitations
- Low tensile strength compared to alloyed or TMT bars
- Poor corrosion resistance (prone to rust)
- Not ideal for load-bearing structural components
- Requires protective coating (paint, galvanizing) for outdoor use
Industry Standards
| Standard | Country/Region | Description |
| IS 2062 | India | Standard for mild steel structural bars |
| ASTM A36 | USA | Standard for carbon steel bars (general purpose) |
| BS 4360 | UK | Weldable structural steel |
| EN 10025 | Europe | Hot-rolled structural steel |
Sizes and Availability
- Diameter range: 6 mm to 50 mm (for round bars)
- Length: Usually 6 meters (standard), can be custom-cut
- Custom shapes: Available upon request
Summary Table
| Feature | Mild Steel Bar Details |
| Material | Low carbon steel (0.15–0.25% carbon) |
| Strength | Moderate (Tensile: ~400–550 MPa) |
| Form Factors | Round, square, flat, hexagonal |
| Workability | Excellent for welding, machining, and forming |
| Applications | Fabrication, light construction, grills, scaffolding |
| Protection Needed | Paint, primer, or galvanization for corrosion resistance |
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