Alloy 455，Custom 455 Foil，Shim，UNS S45500，EFORU

British Specs:，American Specs:AMS 5617 Bar and Forgings AMS 5860 Sheet, Strip and Plate，German Specs:

### **Alloy 455 / Custom 455 Foil & Shim Stock (UNS S45500) - Product Introduction** **Overview** **Alloy 455**, commercially known as **Custom 455**, is a premium martensitic precipitation-hardening stainless steel that offers an exceptional combination of ultra-high strength, good corrosion resistance, and excellent toughness. **Custom 455 Foil and Shim Stock** represents the thin-gauge product form of this high-performance alloy, providing maximum strength properties in precision thin-gauge applications where space constraints and reliability are critical factors. The UNS **S45500** designation identifies this specific precipitation-hardening stainless steel composition. Available in ultra-thin gauges, Custom 455 foil and shim stock maintain the alloy's characteristic ultra-high strength properties while providing the formability and precision required for specialized applications in aerospace, electronics, and precision instrumentation. --- ### **Chemical Composition** | Element | Content (%) | | :--- | :--- | | **Iron (Fe)** | Balance | | **Chromium (Cr)** | 11.0 - 12.5 | | **Nickel (Ni)** | 7.5 - 9.5 | | **Copper (Cu)** | 1.5 - 2.5 | | **Niobium (Nb)** | 0.1 - 0.5 | | **Titanium (Ti)** | 0.8 - 1.4 | | **Manganese (Mn)** | 0.50 (Max) | | **Silicon (Si)** | 0.50 (Max) | | **Carbon (C)** | 0.05 (Max) | | **Phosphorus (P)** | 0.04 (Max) | | **Sulfur (S)** | 0.03 (Max) | **Key Feature:** The balanced composition creates a precipitation-hardenable martensitic structure capable of achieving the highest strength levels available in foil and shim products, while maintaining good corrosion resistance. --- ### **Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 7.76 g/cm³ (0.280 lb/in³) | | **Melting Point** | 1400-1440°C (2550-2625°F) | | **Electrical Resistivity** | 85 μΩ·cm at 20°C | | **Thermal Conductivity** | 18.5 W/m·K at 20°C | | **Thermal Expansion Coefficient** | 10.1 μm/m·°C (20-100°C) | | **Magnetic Permeability** | Magnetic after heat treatment | --- ### **Mechanical Properties** Typical mechanical properties for Custom 455 foil and shim stock: | Thickness Range | Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) | | :--- | :--- | :--- | :--- | :--- | | **0.001-0.010" (0.025-0.25mm)** | Solution Treated | 1000-1200 MPa (145-175 ksi) | 950-1100 MPa (140-160 ksi) | 10-15 | | **0.001-0.010" (0.025-0.25mm)** | H900 Aged | 1550-1750 MPa (225-255 ksi) | 1450-1650 MPa (210-240 ksi) | 6-10 | | **0.001-0.010" (0.025-0.25mm)** | H1000 Aged | 1400-1600 MPa (200-230 ksi) | 1300-1500 MPa (190-220 ksi) | 8-12 | --- ### **International Standards** | Standard Organization | Standard Number | Specification | | :--- | :--- | :--- | | **ASTM** | ASTM A693 | Precipitation Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip | | **AMS** | AMS 5606 | Steel Plate, Corrosion-Resistant, 12Cr - 9Ni - 1.5Cu - 1.0Ti | | **ASME** | SA-693 | Precipitation Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip | | **UNS** | S45500 | Alloy 455 | | **ASTM** | A666 | Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar | --- ### **Product Specifications & Applications** **Product Forms & Sizes:** - **Foil:** 0.001" to 0.005" (0.025mm to 0.127mm) thickness - **Shim Stock:** 0.002" to 0.010" (0.051mm to 0.254mm) thickness - **Standard Widths:** 6" to 24" (152mm to 610mm) - **Available Conditions:** Solution Treated, Aged (Various tempers) - **Tolerance:** Precision rolled to ±10% of nominal thickness **Aerospace & Defense Applications:** - Precision shims in aircraft engines - Missile component shielding - Thin structural spacers - Avionics protection layers - Satellite component shims **Electronics & Electrical:** - RFI/EMI shielding components - High-strength electrical contacts - Spring contact elements - Connector components - Battery current collectors **Medical Devices:** - Surgical instrument components - Medical spring elements - Precision medical shims - Dental instrument parts - Implant device components **Industrial Applications:** - High-strength precision gaskets - Critical alignment shims - Vibration damping materials - Thermal management interfaces - Precision washers and spacers **Instrumentation:** - Precision instrument springs - Sensor components - Control mechanism parts - Measuring device elements - Precision mechanical components --- ### **Fabrication Advantages** **Stamping and Blanking:** - Excellent punchability in solution-treated condition - Clean, burr-free edges achievable - Good dimensional stability - Suitable for high-precision blanking - Minimal tool wear with proper selection **Forming Characteristics:** - **Bending:** Good formability in solution-treated condition - **Coining:** Suitable for precision features - **Embossing:** Good definition achievable - **Springback:** Predictable and consistent **Heat Treatment Response:** - Consistent aging response throughout thickness - Minimal distortion during heat treatment - Uniform mechanical properties - Repeatable performance characteristics --- ### **Key Advantages** - **Ultra-High Strength:** Maximum strength available in foil/shim form - **Precision Thickness Control:** Consistent gauge maintenance - **Excellent Spring Properties:** Ideal for high-stress spring applications - **Good Corrosion Resistance:** Suitable for most industrial environments - **Temperature Resistance:** Serviceable from cryogenic to 425°C (800°F) - **Dimensional Stability:** Minimal distortion during heat treatment - **Magnetic Properties:** Can be tailored for specific applications **Special Considerations for Foil/Shim Applications:** - Available with protective interleaving - Custom slitting services available - Precision tension leveling for superior flatness - Special surface finishes upon request - Custom heat treatment available --- ### **Quality Assurance** **Testing and Certification:** - Chemical analysis certification - Mechanical testing verification - Dimensional accuracy certification - Surface quality inspection - Flatness and straightness verification - Heat treatment certification **Special Testing Available:** - Corrosion testing per ASTM standards - Spring rate testing - Fatigue testing - Surface roughness measurement - Microstructure examination Custom 455 Foil and Shim Stock (UNS S45500) provides the unique combination of ultra-high strength, precision dimensional control, and good corrosion resistance in thin-gauge form. Its exceptional strength characteristics make it invaluable for aerospace, defense, medical, and precision industrial applications where maximum strength in minimal cross-sections is required. The foil and shim forms offer unparalleled performance for applications demanding the highest strength-to-weight ratios combined with reliable performance in demanding service environments.

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 1700 gallon liquid totes Special package is available on request.