Alloy 455，Custom 455 Tube，UNS S45500，EFORU

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

### **Alloy 455 / Custom 455 Tube (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 Tube** provides these superior properties in tubular form, making it ideal for precision applications requiring high strength-to-weight ratios, pressure integrity, and reliable performance in demanding environments including aerospace, defense, and high-performance industrial applications. The UNS **S45500** designation identifies this specific precipitation-hardening stainless steel composition. Custom 455 tube is particularly valued for applications requiring maximum strength, dimensional stability during heat treatment, and 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 tube 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 A632 | Seamless and Welded Austenitic Stainless Steel Tubing (Small-Diameter) | | **ASTM** | ASTM A269 | Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing | | **AMS** | AMS 5617 | Precipitation Hardening Stainless Steel Bars and Forgings | | **ASME** | SA-269 | Seamless and Welded Austenitic Stainless Steel Tubing | | **UNS** | S45500 | Alloy 455 | | **ASTM** | A511 | Standard Specification for Seamless Stainless Steel Mechanical Tubing | --- ### **Product Specifications** **Tube Specifications:** - **Outside Diameter:** 1/16" to 4" (1.6mm to 101.6mm) - **Wall Thickness:** 0.010" to 0.250" (0.25mm to 6.35mm) - **Length:** Standard 20 feet, custom lengths available - **Tolerance:** Precision drawn to tight dimensional tolerances - **Types:** Seamless, Welded & Drawn, Welded & Annealed **Available Conditions:** - Solution Treated - Solution Treated and Aged - Annealed - Hard Drawn - Half-Hard --- ### **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 fabrication and machining **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 & Defense:** - Aircraft hydraulic tubing - Missile and rocket components - Actuator cylinders - Fuel and hydraulic lines - Precision instrument tubing **Oil & Gas Industry:** - Downhole instrumentation - Chemical injection lines - Pressure sensing tubing - Well monitoring systems - Control system tubing **Medical Devices:** - Surgical instrument components - Medical gas systems - Precision medical tubing - Dental equipment - Orthopedic device components **Industrial Equipment:** - High-pressure hydraulic systems - Instrumentation tubing - Precision mechanical components - Bearing sleeves - Special machinery parts **Power Generation:** - Instrumentation lines - Control systems - Hydraulic control tubing - Precision mechanical applications --- ### **Fabrication Characteristics** **Machining:** - Best machined in solution-treated condition - Machinability rating: 45% (compared to 1212 steel) - Good surface finish achievable - Suitable for precision machining operations **Tube Fabrication:** - **Bending:** Good bendability in annealed condition - **Flaring:** Suitable for flaring operations - **Swaging:** Can be swaged to smaller diameters - **Beading:** Suitable for mechanical joints **Welding:** - **GTAW (TIG):** Preferred method - **Filler Metal:** Custom 455 or similar PH stainless - **Post-weld Heat Treatment:** Required for maximum properties - **Weld Quality:** Excellent when proper procedures followed --- ### **Key Advantages** - **Ultra-High Strength:** Maximum strength available in tubular form - **Excellent Strength-to-Weight Ratio:** Ideal for weight-critical applications - **Good Corrosion Resistance:** Suitable for most industrial environments - **Precision Dimensional Control:** Tight tolerances for critical applications - **Dimensional Stability:** Minimal distortion during heat treatment - **Temperature Resistance:** Serviceable from cryogenic to 425°C (800°F) - **Pressure Capability:** High burst strength **Design Considerations:** - Maximum service temperature: 425°C (800°F) - Suitable for cryogenic applications - Good resistance to stress corrosion cracking - Magnetic after heat treatment - Excellent for high-pressure applications --- ### **Quality Assurance** **Testing and Certification:** - Hydrostatic testing - Eddy current testing - Ultrasonic examination - Dimensional verification - Surface quality inspection - Material certification **Certification Standards:** - ASTM A632 requirements - Customer-specific specifications - Aerospace industry standards - Medical device regulations (where applicable) Custom 455 Tube (UNS S45500) represents a premium precipitation-hardening stainless steel in tubular form that provides an outstanding combination of ultra-high strength, good corrosion resistance, and precision dimensional characteristics. Its superior properties make it particularly valuable for aerospace, defense, medical, and high-performance industrial applications where maximum strength, reliability, and precision 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 1693 gallon liquid totes Special package is available on request.