Alloy 455，Custom 455 Strip，UNS S45500，EFORU

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

### **Alloy 455 / Custom 455 Strip (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 Strip** provides these superior properties in thin, precision-rolled form, making it ideal for applications requiring high strength-to-weight ratios, precise dimensional control, and reliable performance in demanding environments such as aerospace, electronics, and medical devices. The UNS **S45500** designation identifies this specific precipitation-hardening stainless steel composition. Custom 455 strip is particularly valued for applications requiring maximum strength in minimal cross-sections, dimensional stability during heat treatment, and good corrosion resistance comparable to standard austenitic stainless steels. --- ### **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 strip after heat treatment: | Temper | 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 | --- ### **Product Specifications** **Strip Specifications:** - **Thickness Range:** 0.001" to 0.125" (0.025mm to 3.18mm) - **Width Range:** 0.125" to 24" (3.18mm to 610mm) - **Length:** Coils or straight lengths - **Tolerance:** Precision rolled to tight dimensional tolerances - **Edge:** Slit edge, rolled edge, or custom edge **Available Tempers:** - Solution Treated (Condition A) - Quarter Hard - Half Hard - Full Hard - Spring Temper **Surface Finish:** - 2B Finish - Bright Annealed - Matte Finish - Special polished finishes available --- ### **Heat Treatment** **Solution Treatment:** - Temperature: 815-830°C (1500-1525°F) - Time: 15-30 minutes - Cooling: Air cool or faster - Result: Soft condition for forming and stamping **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** **Electronics & Electrical Components:** - Connector contacts - Spring contacts - Lead frames - Switch components - Relay parts - Battery contacts **Aerospace & Defense:** - Precision springs - Shims and spacers - Instrument components - Control system parts - Guidance system components **Medical Devices:** - Surgical instrument components - Spring elements - Clips and fasteners - Orthopedic device parts - Dental instrument components **Industrial Applications:** - Precision springs - Snap rings - Retaining rings - Washers - Small fasteners - Bearing components **Automotive Applications:** - Sensor components - Fuel system parts - Electrical connectors - Spring clips - Control system components --- ### **Fabrication Advantages** **Stamping and Blanking:** - Excellent punchability and blanking characteristics - Clean, burr-free edges - Consistent dimensional stability - High-speed production capability - Minimal tool wear **Forming Characteristics:** - **Bending:** Excellent in solution-treated condition - **Coining:** Good for precise formed features - **Deep Drawing:** Limited formability - **Embossing:** Good definition achievable **Machining Performance:** - **Blankability:** Excellent for precision blanking - **Surface Finish:** Superior surface quality - **Tool Life:** Good with proper tool selection - **Punch Life:** Extended with proper clearances --- ### **Recommended Fabrication Parameters** **Stamping:** - Clearance: 5-8% of material thickness - Punch Radius: 0.001-0.003 inches - Die Radius: 0.002-0.004 inches - Stripper Pressure: 10-20% of punching force **Heat Treatment:** - Solution Treatment: 815-830°C (1500-1525°F), 15-30 minutes - Aging: Various temperatures as specified - Atmosphere: Controlled atmosphere recommended - Quench: Air cool --- ### **Key Advantages** - **Ultra-High Strength:** Maximum strength available in strip form - **Precision Dimensional Control:** Tight thickness and width tolerances - **Excellent Spring Properties:** Ideal for high-stress spring applications - **Good Corrosion Resistance:** Suitable for most industrial environments - **Non-Magnetic Options:** Available in certain conditions - **High Strength-to-Weight Ratio:** Perfect for weight-critical applications - **Consistent Quality:** Uniform properties throughout coil length - **Economic Production:** Ideal for high-volume automated manufacturing **Design Considerations:** - Maximum service temperature: 425°C (800°F) - Best formed in solution-treated condition - Suitable for cryogenic applications - Good resistance to stress corrosion cracking - Magnetic after heat treatment --- ### **Quality Assurance** **Testing and Certification:** - Chemical analysis certification - Mechanical testing verification - Dimensional accuracy certification - Surface quality inspection - Edge condition verification - Flatness testing **Special Testing Available:** - Corrosion testing per ASTM standards - Spring testing and fatigue analysis - Surface roughness measurement - Microstructure examination Custom 455 Strip (UNS S45500) provides manufacturers with an optimal combination of ultra-high strength, precision dimensional control, and good corrosion resistance in strip form. Its superior characteristics make it particularly valuable for high-volume production of electronic components, springs, connectors, medical devices, and precision mechanical parts requiring reliable performance in demanding environments. The strip form offers excellent versatility for stamped, formed, and fabricated components where maximum strength and precision are critical requirements.

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 1696 gallon liquid totes Special package is available on request.