MARS 440 Armor Plate (MIL-DTL-12560 Class 4)

At UTMK, you can procure certified MARS 440 Armor Plate for mission-critical defense and security applications. This Medium Hardness Armor, developed by ArcelorMittal, provides an optimized balance of hardness (typical 440 HBW), high toughness, and excellent formability. It is specifically engineered to protect vehicle structures and occupants from blast loads, such as mines and Improvised Explosive Devices (IEDs).

MARS 440 Technical Specifications

MARS 440 (liquid quenched, Class 4a) is supplied in accordance with rigorous production standards, ensuring consistent properties and ballistic performance across every plate. The material is tested according to standards including EN ISO 6506-1 (Hardness) and EN ISO 148-1 (Impact).

Core Advantages of MARS 440 Plate

• Superior Blast Protection: Unlike high-hardness steels (like 500 HBW) optimized only for ballistic penetration, MARS 440 is engineered to absorb and dissipate explosive energy. Its "optimal compromise" of hardness and high ductility prevents brittle fracture during a blast event, making it the ideal structural material for V-shaped floors and vehicle hulls.


• Excellent Workability & Fabrication: Despite its high strength, the steel possesses excellent workability, particularly for welding and cold bending. This allows fabricators to create the complex geometric profiles required for modern blast-protection designs.


• Guaranteed Toughness: The steel offers high impact toughness (≥ 22 J at -40°C), ensuring it remains ductile and resists cracking even in sub-zero conditions or under severe dynamic loads.


• Exceptional Homogeneity: A specialized liquid-quenching (Q+T) process ensures consistent mechanical properties and hardness across the entire plate, delivering reliable, predictable performance.


• Superior Flatness: Guaranteed flatness tolerance of \leq 3 mm/m simplifies fabrication, cutting, and welding processes, ensuring components fit together with precision.

Fields of Application

• Military & Defense:


• Structural components (hulls, V-shaped floors) for Armored Personnel Carriers (APCs) and combat vehicles requiring protection against mines and IEDs according to STANAG 4569.


• Fabrication and repair of vehicles certified to MIL-DTL-12560 Class 4 specifications.


• Add-on armor packages, blast shields, and fragmentation protection.


• Civilian & Security:


• Armoring for civil vehicles, including SUVs, limousines, and Cash-In-Transit (CIT) vehicles.


• Manufacturing of bulletproof doors, high-security window frames, and reinforced wall panels for critical infrastructure.


• Construction of reinforced safe rooms and panic rooms.

Procure Certified MARS 440 MIL-DTL-12560 Plate

Review the available dimensions and prices for MARS 440 Armor Plate in the catalog above. Our inventory is certified and ready for immediate dispatch to ensure your production continuity. Contact our sales department to confirm stock levels and place your order for standard plates.

To ensure operational continuity and mitigate supply chain risks, UTMK offers a comprehensive range of certified armor steels. While MARS 440 provides standard protection, projects requiring superior ballistic resistance should utilize MARS 500 Armor Plate. For structural components demanding extreme toughness and workability, we recommend MARS 380 Armor Plate. For non-military applications focused on abrasion resistance, consider Hardox 450 Wear Plate with our ISO-compliant processing services.

Full-Service Project Consultation & Processing

Does your project require more than just raw material? UTMK's in-house processing facilities specialize in handling high-strength armor. Our technical experts can consult on your designs and deliver precision-cut and formed components, reducing your risk and production complexity. Contact us to discuss your project requirements and receive a comprehensive quote.