BP440 Ballistic Protection Steel Plate Material
Bisalloy Protection 440 Steel Plate – High Strength Ballistic Protection Grade
Explore the properties, chemical composition, mechanical and thermal data of Bisalloy Protection 440 steel plate, a high-strength quenched and tempered steel designed for ballistic and blast protection applications.
Welding, cutting, bending, machining, forming
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BP440 Ballistic Protection Steel Plate Introduction
Bisalloy Protection 440 is a high-strength, quenched and tempered structural steel plate specifically engineered for ballistic and blast protection. With a minimum yield strength of 440 MPa and excellent weldability, it offers reliable performance in armoured vehicles, security buildings, and protective barriers. The steel combines good formability with consistent mechanical properties over a range of plate thicknesses, meeting rigorous defence and civil protection standards. Its fine-grained microstructure ensures high toughness at low temperatures, providing reliable resistance against dynamic impacts.
BP440 Ballistic Protection Steel Plate Chemical Composition
Typical chemical composition of Bisalloy Protection 440 steel as per manufacturer specifications. Values are ladle analysis. The alloy design ensures a balanced combination of strength, toughness, and weldability.
- Low carbon content for weldability
- Microalloying elements for grain refinement
- Controlled sulfur and phosphorus for high cleanliness
| Element | Standard Value | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.20 | |
| Silicon (Si) | ≤ 0.50 | |
| Manganese (Mn) | ≤ 1.60 | |
| Phosphorus (P) | ≤ 0.015 | |
| Sulfur (S) | ≤ 0.005 | |
| Chromium (Cr) | 0.40 - 0.80 | |
| Nickel (Ni) | ≤ 0.30 | |
| Molybdenum (Mo) | ≤ 0.25 | |
| Boron (B) | ≤ 0.005 |
BP440 Ballistic Protection Steel Plate Thermal and Electrical Physical Properties
Typical physical properties of Bisalloy Protection 440 steel at room temperature unless otherwise noted. These values are generic for low-alloy quenched and tempered steels and may vary slightly with exact chemical composition.
- Density is consistent with standard steel alloys.
- Thermal expansion and conductivity are important for welding procedure design.
- Electrical resistivity is moderate, common to alloy steels.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic modulus (E) | 210 | GPa | At 20 °C |
| Shear modulus (G) | 80 | GPa | At 20 °C |
| Poisson's ratio (ν) | 0.3 | - | |
| Thermal expansion coefficient (α) | 12.5 ×10⁻⁶ | K⁻¹ | 20 °C to 300 °C |
| Thermal conductivity (λ) | 40 | W/(m·K) | At 20 °C |
| Specific heat capacity (c) | 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρ_e) | 0.25 ×10⁻⁶ | Ω·m | At 20 °C |
BP440 Ballistic Protection Steel Plate Mechanical Properties
Mechanical properties of Bisalloy Protection 440 steel plate in quenched and tempered condition. Values are minimum unless otherwise stated. Testing is performed at room temperature and in accordance with relevant Australian standards. The combination of high strength and good ductility makes it suitable for impact-loaded structures.
- Yield and tensile strength vary with plate thickness.
- Charpy V-notch impact toughness ensures reliable performance at low temperatures.
- Brinell hardness control aids in uniform ballistic resistance.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (Rp0.2) | ≥ 440 | MPa | Thickness ≤ 20 mm, transverse |
| Yield strength (Rp0.2) | ≥ 420 | MPa | Thickness >20 mm ≤50 mm, transverse |
| Tensile strength (Rm) | 700 - 900 | MPa | Transverse, all thicknesses |
| Elongation (A5) | ≥ 14 | % | Gauge length 5.65√So, transverse |
| Elongation (A5) | ≥ 12 | % | Gauge length 50 mm, transverse |
| Charpy impact energy (KV2) | ≥ 27 | J | -40 °C, longitudinal |
| Brinell hardness (HBW) | 400 - 500 | HBW | Typical, all thicknesses |
BP440 Ballistic Protection Steel Plate Equivalent Material Standards and Substitutes
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Australia | - | Bisalloy Protection 440 | Proprietary grade; no direct equivalent in public international standards. |
BP440 Ballistic Protection Steel Plate Application Introduction
Bisalloy Protection 440 is specifically developed to meet the demands of high-performance ballistic and blast protection. Its balanced mechanical properties, good weldability, and consistent through-thickness hardness allow it to be fabricated into a wide range of protective components. The material is typically supplied in the quenched and tempered condition and can be cut, formed, and welded using standard procedures, provided proper preheating and post-weld practices are followed. Designing with this steel often integrates it into multi-layered defence systems to optimise weight and cost.
- Excellent resistance to small arms fire and fragments.
- Can be used in combination with other armour materials.
- Maintains toughness at sub-zero temperatures.
Product Applications: Armoured vehicle hulls and body panels, Ballistic security doors and window frames, Blast-resistant containers and enclosures, Safe deposit boxes and vaults, Guard houses and checkpoints, Military and police vehicle shields
Processed into products: Welded armour plates (side, roof, floor), Door panels and b-pillar reinforcements, Fragmentation shields, Vault wall liners, Anti-ram bollards, Bulletproof partition walls
Application industries: Defence and military, Security and cash-in-transit, Civil protection and infrastructure, Energy and mining security, Automotive (armoured vehicles)
BP440 Ballistic Protection Steel Plate Similar / Alternative Protection Grades
| Region | Standard / Manufacturer | Grade | Remarks |
|---|---|---|---|
| Global | SSAB | Armox 370T | Ballistic steel with nominal hardness 370-430 HBW and higher yield strength (~1000 MPa); suitable for more demanding ballistic protection. |
| Australia | Bisalloy | Protection 500 | Higher hardness and tensile strength variant from the same manufacturer; improved multi-hit performance. |
| Europe | EN 10025-6 | S460Q / S460QL | Quenched & tempered structural steel with comparable yield strength (≥460 MPa); lacks ballistic certification but may be utilized in less critical protective applications. |
Notes:
- All data provided are based on typical manufacturer specifications and should be verified with an official mill certificate before material selection.
- Welding consumables should be selected to match the strength and toughness requirements; low-hydrogen practices are essential.
- Post-weld heat treatment is generally not required unless for stress relief in thick sections.
- When forming, a larger bend radius than usual may be required due to the material's strength; consult forming guidelines.
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