BS S106 Steel (4S106D)
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BS S106 (MSRR 6001, EN40B (744M24))
BS S106 is a low carbon mild steel grade known for its good weldability, machinability, and ductility. It is commonly used in general structural and engineering applications where moderate strength and toughness are required.
Chemical Composition:
| Element | Min | Max |
|---|---|---|
| C | 0.23 | 0.28 |
| Si | 1.30 | 1.70 |
| Mn | 1.20 | 1.50 |
| P | 0.0 | 0.01 |
| S | 0 | 0.01 |
| Cr | 2.00 | 4.00 |
| Mo | 0.35 | 0.45 |
| Ni | 1.65 | 2.00 |
Mechanical Properties:
| Property | Value / Range |
|---|---|
| Tensile Strength | 370 – 510 MPa |
| Yield Strength | ≥ 240 MPa |
| Elongation | ≥ 25 % |
| Hardness | Up to 150 HB |
Physical Properties:
| Property | Value |
|---|---|
| Density | ~7.85 g/cm³ |
| Modulus of Elasticity | ~210 GPa |
| Thermal Conductivity | ~50 W/m·K |
| Specific Heat Capacity | ~460 J/kg·K |
| Melting Point | ~1425 – 1540 °C |
Heat Treatment:
- Annealing: Improves machinability and ductility
- Normalizing: Refines grain structure and improves toughness
Applications:
- Structural components
- General engineering fabrication
- Machine parts
- Automotive body panels
- Welded assemblies
Corrosion Resistance
BS S106 has low corrosion resistance and typically requires protective coatings such as paint or galvanizing for use in environments exposed to moisture or corrosive agents.