MDSI 100M STEEL

Description

Chemical Composition (Typical %)

Element	Percentage (%)
Carbon (C)	0.08 – 0.15
Manganese (Mn)	0.50 – 1.30
Phosphorus (P)	≤ 0.015
Sulfur (S)	≤ 0.010
Silicon (Si)	0.15 – 0.50
Nickel (Ni)	0.80 – 1.50
Chromium (Cr)	0.40 – 1.20
Molybdenum (Mo)	0.15 – 0.40
Vanadium (V)	0.03 – 0.10
Copper (Cu)	0.15 – 0.50

Exact composition may vary based on manufacturing standards and supplier specifications.

Mechanical Properties

Property	Value
Yield Strength	≥ 100 ksi (690 MPa)
Tensile Strength	115 – 130 ksi (795 – 900 MPa)
Elongation (2 in.)	14 – 16%
Hardness (Brinell)	250 – 310 HB
Charpy V-Notch Impact Toughness (at -40°C)	≥ 30 ft-lbs (41 J)
Modulus of Elasticity	~200 GPa

Key Features and Benefits

• High Strength-to-Weight Ratio – Offers excellent mechanical properties with reduced material weight, making it suitable for lightweight structural applications.
• Superior Toughness – Maintains high impact resistance, even at sub-zero temperatures.
• Good Weldability – Can be welded using conventional methods, including SMAW, GMAW, and FCAW, without significant loss of mechanical properties.
• Corrosion and Wear Resistance – Addition of alloying elements like chromium and molybdenum improves durability and longevity in harsh environments.
• Machinability – Can be machined with standard cutting tools, though preheating is recommended for thick sections.
• Heat Treatable – Can be quenched and tempered to achieve specific hardness and strength levels.

Applications

• Defense and Military: Used in armored vehicles, ballistic protection, and structural components requiring high durability.
• Construction and Structural Engineering: Ideal for bridges, high-rise buildings, and heavy-duty frameworks.
• Industrial Equipment: Utilized in mining machinery, lifting equipment, and offshore structures.
• Automotive and Transportation: Suitable for chassis components, truck frames, and high-performance vehicle parts.
• Aerospace: Used in high-strength structural applications where weight reduction is critical.

Processing and Fabrication Guidelines

• Cutting: Plasma cutting, laser cutting, and waterjet cutting are preferred for clean edges.
• Welding: Preheating is recommended for thick sections to prevent cracking. Low-hydrogen electrodes are preferred.
• Forming: Can be cold-formed but requires controlled bending due to its high strength.
• Heat Treatment: Typical tempering range is 400–600°F (204–316°C) for optimal mechanical properties.
• Surface Treatment: Can be coated with anti-corrosion treatments or painted for additional protection.

Compliance and Standards

MDSI 100M Steel meets or exceeds the requirements of the following specifications:

• ASTM A514 / A517 (Similar HSLA steel standards)
• MIL-DTL-46100 (Applicable to armor-grade variants)
• EN 10025-6 S690QL (European equivalent standard)
• AWS D1.1 (Welding qualification standards)