Alloy 455，Custom 455 Rod，UNS S45500，EFORU

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

### **Alloy 455 / Custom 455 Rod (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 high strength, good corrosion resistance, and excellent toughness. **Custom 455 Rod** provides these superior properties in rod form, making it an ideal material for machining high-strength components that require reliability in demanding environments. The rod product form is particularly suited for applications requiring extensive machining followed by heat treatment to achieve maximum mechanical properties. The UNS **S45500** designation identifies this specific precipitation-hardening stainless steel composition. Custom 455 rod is valued for its ability to achieve ultra-high strength levels while maintaining 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 over 1550 MPa (225 ksi) after proper heat treatment. --- ### **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 rod after heat treatment: | Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation (%) | Hardness (Rockwell) | | :--- | :--- | :--- | :--- | :--- | | **Solution Treated** | 1000-1200 MPa (145-175 ksi) | 950-1100 MPa (140-160 ksi) | 10-15 | C25-32 | | **H900 Aged** | 1550-1750 MPa (225-255 ksi) | 1450-1650 MPa (210-240 ksi) | 6-10 | C44-48 | | **H1000 Aged** | 1400-1600 MPa (200-230 ksi) | 1300-1500 MPa (190-220 ksi) | 8-12 | C40-44 | | **H1050 Aged** | 1250-1450 MPa (180-210 ksi) | 1150-1350 MPa (170-195 ksi) | 10-14 | C36-40 | --- ### **International Standards** | Standard Organization | Standard Number | Specification | | :--- | :--- | :--- | | **ASTM** | ASTM A564/A564M | Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes | | **AMS** | AMS 5617 | Precipitation Hardening Stainless Steel Bars and Forgings | | **ASME** | SA-564 | Age-Hardening Stainless Steel Bars for Pressure Vessels | | **UNS** | S45500 | Alloy 455 | | **ASTM** | ASTM A108 | Standard for Steel Bars, Carbon, Cold-Finished | | **AMS** | AMS 2759/3 | Heat Treatment of Steel Parts | --- ### **Rod Specifications** **Product Specifications:** - **Diameter Range:** 1/8" to 8" (3mm to 200mm) - **Length:** Standard 12' to 20' (3.6m to 6m), cut lengths available - **Tolerances:** Hot rolled ±1%, Cold drawn ±0.005" - **Conditions:** Solution treated, centerless ground, hot rolled, cold drawn - **Surface Finish:** Black, peeled, turned, or polished **Available Conditions:** - Solution Treated (Condition A) - Solution Treated and Aged (Various tempers) - Cold Drawn - Centerless Ground --- ### **Heat Treatment** **Solution Treatment:** - Temperature: 815-830°C (1500-1525°F) - Time: 30 minutes per inch of thickness - Cooling: Air cool or faster - Result: Soft condition for machining (RC 25-32) **Aging Treatments:** - **H900:** 480°C (900°F) for 4 hours, air cool - **H950:** 510°C (950°F) for 4 hours, air cool - **H1000:** 540°C (1000°F) for 4 hours, air cool - **H1050:** 565°C (1050°F) for 4 hours, air cool --- ### **Product Applications** **Aerospace Components:** - Aircraft landing gear parts - Missile and rocket components - Engine mounts and brackets - Structural airframe components - Actuator shafts and components **Defense Applications:** - Firearm components (barrels, bolts) - Armor system parts - Military vehicle components - Weapon system mechanisms - Defense mechanism shafts **Industrial Equipment:** - High-strength shafts and axles - Pump shafts and components - Valve stems and parts - Machinery spindles - Tooling components **Marine Applications:** - Marine shafting components - Submarine mechanism parts - Naval vessel components - Offshore equipment shafts - Marine hardware **Medical Devices:** - Surgical instrument components - Orthopedic implant parts - Medical tooling shafts - Dental instrument components --- ### **Machining Characteristics** **Machinability:** - Best machined in solution-treated condition (RC 25-32) - Machinability rating: 45% (compared to 1212 steel) - Requires rigid setups and positive rake tools - Recommended tool materials: Carbide or high-speed steel - Use heavy, constant feeds for best results **Recommended Machining Parameters:** - **Turning Speed:** 60-100 SFM - **Drilling Speed:** 30-50 SFM - **Feed Rates:** 0.005-0.015 inches per revolution - **Coolant:** Water-soluble oils recommended --- ### **Key Advantages** - **Ultra-High Strength:** Capable of achieving yield strengths over 1450 MPa (210 ksi) - **Excellent Strength-to-Weight Ratio:** Ideal for weight-critical applications - **Good Corrosion Resistance:** Superior to most martensitic stainless steels - **Simple Heat Treatment:** Single-step aging process after machining - **Dimensional Stability:** Minimal distortion during heat treatment - **Good Machinability:** Can be readily machined in solution-treated condition - **High Toughness:** Good combination of strength and fracture toughness **Design Considerations:** - Maximum service temperature: 425°C (800°F) - Not recommended for prolonged exposure above 425°C - Suitable for cryogenic applications - Good resistance to stress corrosion cracking --- ### **Quality Assurance** **Testing and Certification:** - Chemical analysis certification - Mechanical testing at room temperature - Hardness testing verification - Ultrasonic testing (as required) - Microstructure examination - Corrosion testing (upon request) **Certification Standards:** - ASTM A564 requirements - AMS 5617 specifications - Customer-specific requirements - Traceability documentation Custom 455 Rod (UNS S45500) represents a premium precipitation-hardening stainless steel in rod form that provides an outstanding combination of ultra-high strength, good corrosion resistance, and excellent mechanical properties. Its superior characteristics make it particularly valuable for aerospace, defense, marine, and medical applications where maximum strength, reliability, and precision machining capabilities are critical requirements. The rod form offers excellent versatility for manufacturing high-strength components that must perform reliably 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 1690 gallon liquid totes Special package is available on request.