Alloy 455，Custom 455 Sheet，UNS S45500，EFORU

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

### **Alloy 455 / Custom 455 Sheet (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 Sheet** provides these superior properties in thin, flat-rolled form, making it ideal for applications requiring high strength-to-weight ratios, formability, and reliable performance in demanding environments. The UNS **S45500** designation identifies this specific precipitation-hardening stainless steel composition. Custom 455 sheet is particularly valued for applications requiring maximum strength, dimensional stability during heat treatment, and good corrosion resistance comparable to standard austenitic stainless steels, while offering the fabrication versatility of sheet material. --- ### **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 tensile strengths exceeding 1550 MPa (225 ksi) after proper heat treatment, while maintaining good corrosion resistance in various environments. --- ### **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 sheet after heat treatment: | Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) | Hardness (Rockwell C) | | :--- | :--- | :--- | :--- | :--- | | **Solution Treated** | 1000-1200 MPa (145-175 ksi) | 950-1100 MPa (140-160 ksi) | 10-15 | 25-32 | | **H900 Aged** | 1550-1750 MPa (225-255 ksi) | 1450-1650 MPa (210-240 ksi) | 6-10 | 44-48 | | **H1000 Aged** | 1400-1600 MPa (200-230 ksi) | 1300-1500 MPa (190-220 ksi) | 8-12 | 40-44 | | **H1050 Aged** | 1250-1450 MPa (180-210 ksi) | 1150-1350 MPa (170-195 ksi) | 10-14 | 36-40 | --- ### **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 | | **MIL-S** | MIL-S-23195 | Steel Plate, Alloy, Structural, High Yield Strength | --- ### **Product Specifications** **Sheet Specifications:** - **Thickness Range:** 0.015" to 0.187" (0.38mm to 4.76mm) - **Width Range:** 24" to 48" (610mm to 1219mm) - **Length Range:** 96" to 144" (2438mm to 3658mm) - **Tolerances:** Standard mill tolerances or precision tolerances - **Surface Finish:** 2B, No. 1, BA, or Polished **Available Conditions:** - Solution Treated (Condition A) - Solution Treated and Aged (Various tempers) - Cold Rolled - Annealed --- ### **Heat Treatment** **Solution Treatment:** - Temperature: 815-830°C (1500-1525°F) - Time: 30 minutes minimum - Cooling: Air cool or faster - Result: Soft condition for forming and machining **Aging Treatments:** - **H900:** 480°C (900°F) for 1 hour, air cool - **H950:** 510°C (950°F) for 1 hour, air cool - **H1000:** 540°C (1000°F) for 1 hour, air cool - **H1050:** 565°C (1050°F) for 1 hour, air cool --- ### **Product Applications** **Aerospace & Defense:** - Aircraft structural panels - Missile skin components - Satellite structures - Radar components - Electronic enclosures - Armor applications **Electronics & Electrical:** - High-strength enclosures - Connector components - Shielding applications - Instrument panels - Beryllium replacements **Industrial Equipment:** - High-strength diaphragms - Spring components - Bellows and flexible elements - Precision instrument parts - Special machinery components **Medical Devices:** - Surgical instrument components - Medical equipment housings - Orthopedic device parts - Dental equipment components - Precision medical tools **Transportation:** - High-performance vehicle components - Aerospace interior parts - Defense vehicle applications - Special transportation equipment --- ### **Fabrication Characteristics** **Forming Operations:** - **Bending:** Good in solution-treated condition - **Stamping:** Suitable for formed components - **Deep Drawing:** Limited formability - **Roll Forming:** Suitable for simple shapes - **Shearing:** Clean edges achievable **Machining:** - Best machined in solution-treated condition - Machinability rating: 45% (compared to 1212 steel) - Good surface finish achievable - Suitable for precision blanking **Welding:** - **GTAW (TIG):** Preferred method - **Resistance Welding:** Suitable for sheet thicknesses - **Filler Metal:** Custom 455 or similar PH stainless - **Post-weld Heat Treatment:** Required for maximum properties --- ### **Key Advantages** - **Ultra-High Strength:** Maximum strength available in sheet form - **Excellent Strength-to-Weight Ratio:** Ideal for weight-critical applications - **Good Corrosion Resistance:** Superior to most martensitic stainless steels - **Dimensional Stability:** Minimal distortion during heat treatment - **Good Formability:** Can be formed in solution-treated condition - **Simple Heat Treatment:** Single-step aging process - **Excellent Surface Finish:** Available in various commercial finishes **Design Considerations:** - Maximum service temperature: 425°C (800°F) - Suitable for cryogenic applications - Good resistance to stress corrosion cracking - Magnetic after heat treatment - Excellent spring properties in aged condition --- ### **Quality Assurance** **Testing and Certification:** - Chemical analysis certification - Mechanical testing verification - Hardness testing - Surface quality inspection - Dimensional verification - Flatness measurement **Certification Standards:** - ASTM A693 requirements - AMS 5606 specifications - Customer-specific requirements - Full traceability documentation Custom 455 Sheet (UNS S45500) represents a premium precipitation-hardening stainless steel in sheet form that provides an outstanding combination of ultra-high strength, good corrosion resistance, and excellent fabrication characteristics. Its superior properties make it particularly valuable for aerospace, defense, electronics, medical, and high-performance industrial applications where maximum strength, light weight, and reliability are critical requirements 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 1695 gallon liquid totes Special package is available on request.