Aermet 100,,UNS K92580,E FORU

### **Aermet 100 / UNS K92580** **Ultra-High Strength Secondary Hardening Steel for Aerospace Applications** --- #### **1. Overview** **Aermet 100** is an ultra-high strength, martensitic steel that belongs to the family of nickel-cobalt secondary hardening steels. It was developed to provide an exceptional combination of very high strength, good fracture toughness, and excellent stress corrosion cracking resistance. These properties make it particularly suitable for demanding aerospace applications, especially where high strength-to-weight ratios are critical. Aermet 100 achieves its superior mechanical properties through a precise heat treatment process that includes austenitizing, quenching, and multiple aging steps to precipitate intermetallic compounds. --- #### **2. Chemical Composition (Weight %)** The typical chemical composition of Aermet 100 is outlined below. The balance is Iron (Fe). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Iron (Fe)** | Balance | Forms the martensitic matrix of the alloy. | | **Nickel (Ni)** | 10.9 - 11.9 | Promotes toughness and hardenability; contributes to secondary hardening. | | **Cobalt (Co)** | 12.8 - 13.8 | Suppresses the transformation of austenite to martensite, allowing for higher tempering temperatures and the formation of fine precipitates. | | **Chromium (Cr)** | 2.80 - 3.25 | Provides secondary hardening and improves corrosion resistance. | | **Molybdenum (Mo)** | 1.15 - 1.35 | Strong carbide former; contributes significantly to secondary hardening and strength. | | **Carbon (C)** | 0.21 - 0.26 | Essential for martensite formation and primary hardening. | | **Manganese (Mn)** | 0.10 - 0.25 | Improves hardenability. | | **Silicon (Si)** | 0.10 - 0.20 | Deoxidizer during steelmaking. | | **Sulfur (S)** | 0.005 max | Kept very low to improve ductility and toughness. | | **Phosphorus (P)** | 0.008 max | Kept very low to improve ductility and toughness. | --- #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 7.92 g/cm³ (0.286 lb/in³) | | **Melting Point** | ~ 1430 - 1510 °C (2606 - 2750 °F) | | **Modulus of Elasticity (Young's Modulus)** | 200 GPa (29.0 x 10⁶ psi) | | **Poisson's Ratio** | 0.30 | | **Thermal Conductivity** | 19.0 - 22.0 W/m·K at 20-100°C | | **Mean Coefficient of Thermal Expansion** | 20 - 100°C: **11.5 x 10⁻⁶/°C** (6.4 x 10⁻⁶/°F) | | **Electrical Resistivity** | ~0.60 μΩ·m at 20°C | --- #### **4. Mechanical Properties (Typical for Peak-Aged Condition)** | Property | Value at Room Temperature | | :--- | :--- | | **Tensile Strength** | 1965 - 2070 MPa (285 - 300 ksi) | | **Yield Strength (0.2% Offset)** | 1725 - 1795 MPa (250 - 260 ksi) | | **Elongation (in 50 mm / 2 in)** | 10 - 12% | | **Reduction of Area** | 45 - 50% | | **Fracture Toughness (K_Ic)** | 110 - 125 MPa√m (100 - 115 ksi√in) | | **Hardness** | 52 - 54 HRC | --- #### **5. International Standards** Aermet 100 is specified in the following standards: * **AMS:** * **AMS 6532:** Steel, Corrosion-Resistant, Bars, Wire, and Forgings (Aermet 100) * **Aerospace Standards:** * Proprietary specifications from airframe manufacturers (e.g., Boeing, Airbus) * **UNS:** K92580 --- #### **6. Product Applications** Aermet 100 is used in the most demanding aerospace structural components: * **Aircraft Landing Gear:** * Landing gear components for fighter aircraft and high-performance jets * Critical pins, bolts, and shafts * **Airframe Components:** * High-strength structural fittings * Arrestor hook components for carrier-based aircraft * **Aerospace Fasteners:** * High-strength bolts and fasteners for critical joints * **Other High-Performance Applications:** * Critical components in race car suspensions * High-performance tooling --- #### **7. Key Characteristics & Advantages** * **Ultra-High Strength:** One of the highest strength commercially available steels. * **Excellent Fracture Toughness:** Unusually high toughness for its strength level. * **Superior Stress Corrosion Cracking (SCC) Resistance:** Significantly better than traditional ultra-high strength steels like 4340 or 300M. * **Good Fatigue Resistance:** Performs well under cyclic loading conditions. * **Secondary Hardening Mechanism:** Strength is derived from fine-scale precipitation during aging, allowing for high-temperature tempering which improves toughness and SCC resistance. * **High Strength-to-Weight Ratio:** Ideal for weight-critical aerospace applications. --- **Disclaimer:** *Aermet 100 is a trademark of Carpenter Technology Corporation. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes. Processing, especially heat treatment, must be strictly controlled to achieve the specified properties.*

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1694 gallon liquid totes Special package is available on request.