AMS 5532 / Multimet N155 Alloy Sheet

AMS 5532 specification covers a corrosion and heat-resistant iron alloy in the form of sheet, strip, and plate.

 

AMS 5532 Multimet N155 is a Nickel-Chromium-Cobalt alloy with additions of Molybdenum and Tungsten used typically in parts requiring high strength up to 1350°F and oxidation resistance up to 1800°F. Its high-temperature properties are inherent in the as-supplied condition (solution treated at 2150°F) and are not dependent on age-hardening.

 

Multimet N155 is used in a number of aerospace applications such as tailpipes and tail cones, turbine blades, shafts and rotors, afterburner components and high-temperature bolts.

Multimet N155 alloy boasts exceptional tensile strength, which is crucial for high-stress applications. At room temperature, its tensile strength ranges from 100 to 140 KSI (689 to 965 MPa). This high tensile strength ensures components can withstand significant stress without deforming, making Multimet N155 ideal for aerospace and industrial applications.

The yield strength of Multimet N155 is approximately 345 MPa (50 KSI) after solution treatment. Yield strength indicates the stress level at which a material begins to deform plastically. Multimet N155 also exhibits an impressive elongation of 40% in 2 inches (50.8 mm) or 4D, showing excellent ductility. These properties ensure that the alloy maintains its structural integrity under various loading conditions, absorbing significant amounts of energy and undergoing substantial deformation without fracturing.

The hardness of Multimet N155 ranges from 156 to 217 HB, indicating its resistance to wear. For flash-welded rings, the hardness can go up to 241 HB. This property contributes to the alloy’s durability, making it suitable for components in abrasive environments.

Multimet N155 has a density of 0.298 lbs per cubic inch or 8.25 g/cm³. This high-density material ensures a substantial weight-to-strength ratio, which is advantageous in applications where both weight and strength are critical.

The modulus of elasticity of Multimet N155 is 29.3 MSI. This measures the material’s stiffness and indicates how much it will deform under a given load. A high modulus of elasticity means the alloy is relatively stiff and will not deform significantly under stress, crucial for maintaining dimensional stability in precision components.

The coefficient of thermal expansion for Multimet N155 is 8.8 x 10^-6 in/in/°F from room temperature to 800°F and 9.7 x 10^-6 in/in/°F from room temperature to 1400°F. This property shows how much the material will expand or contract with temperature changes. A relatively low coefficient of thermal expansion minimizes thermal stress and distortion, beneficial for high-temperature applications.