Alloy 455，Custom 455 Pipe，UNS S45500，EFORU

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

### **Alloy 455 / Custom 455 Pipe (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 Pipe** provides these superior properties in tubular form, making it ideal for high-pressure systems, corrosive fluid handling, and structural applications requiring maximum strength and reliability in demanding environments. The UNS **S45500** designation identifies this specific precipitation-hardening stainless steel composition. Custom 455 pipe is particularly valued for applications requiring high strength-to-weight ratios, pressure containment capability, 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 | | **Cu (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 pipe 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 A789/A789M | Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing | | **ASME** | SA-789 | Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing | | **ASTM** | A269/A269M | Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing | | **AMS** | AMS 5617 | Precipitation Hardening Stainless Steel Bars and Forgings | | **UNS** | S45500 | Alloy 455 | | **ASTM** | A632 | Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing | --- ### **Product Specifications** **Pipe Specifications:** - **Size Range:** 1/8" to 24" NPS (DN6 to DN600) - **Schedule:** SCH 5S to SCH 80S - **Wall Thickness:** 0.065" to 2.000" (1.65mm to 50.8mm) - **Length:** Random (16-24 feet) or Cut Length - **Types:** Seamless and Welded - **Ends:** Plain end, Beveled end, Threaded **Manufacturing Processes:** - Seamless hot extrusion - Welded and cold worked - Solution annealed after fabrication - Non-destructive testing available --- ### **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 welding **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 systems - Missile and rocket propulsion systems - High-pressure air systems - Fuel and oxidizer lines - Actuator and control systems **Oil & Gas Industry:** - High-pressure wellhead components - Chemical injection lines - Instrumentation tubing - Subsea applications - Pressure vessel connections **Chemical Processing:** - High-pressure chemical transfer - Corrosive fluid handling - Process instrumentation lines - Reactor feed systems - Utility service piping **Power Generation:** - High-pressure steam lines - Feedwater systems - Hydraulic control lines - Instrumentation piping - Heat exchanger connections **Special Applications:** - Nuclear instrumentation - Cryogenic systems - High-pressure research systems - Medical gas systems - Semiconductor processing --- ### **Fabrication & Installation** **Machining Characteristics:** - Best machined in solution-treated condition - Machinability rating: 45% (compared to 1212 steel) - Requires rigid setups and positive rake tools - Recommended tool materials: Carbide **Welding Procedures:** - **GTAW (TIG):** Preferred method - **GMAW (MIG):** Suitable with proper technique - **Filler Metal:** Custom 455 or similar PH stainless - **Pre-heat:** Generally not required - **Post-weld Heat Treatment:** Required for maximum properties **Installation Considerations:** - Can be bent and formed in solution-treated condition - Suitable for flanging and expanding - Good for threaded connections - Compatible with standard piping components --- ### **Key Advantages** - **Ultra-High Strength:** Capable of withstanding extreme pressures - **Excellent Strength-to-Weight Ratio:** Ideal for weight-critical applications - **Good Corrosion Resistance:** Suitable for most industrial environments - **Pressure Capability:** High burst and yield pressures - **Dimensional Stability:** Minimal distortion during heat treatment - **Temperature Resistance:** Serviceable from cryogenic to 425°C (800°F) - **Fabrication Versatility:** Can be welded, bent, and machined **Design Considerations:** - Maximum service temperature: 425°C (800°F) - Not recommended for prolonged exposure above 425°C - Suitable for cryogenic applications down to -196°C (-320°F) - Good resistance to stress corrosion cracking - Magnetic after heat treatment --- ### **Quality Assurance** **Testing and Certification:** - Hydrostatic testing - Pneumatic testing - Ultrasonic examination - Eddy current testing - Dimensional verification - Material certification **Certification Standards:** - ASTM A789 requirements - ASME Section VIII - PED 2014/68/EU - NACE MR0175 (where applicable) Custom 455 Pipe (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 excellent pressure containment capability. Its superior characteristics make it particularly valuable for aerospace, defense, oil and gas, and power generation applications where maximum strength, pressure resistance, 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 1692 gallon liquid totes Special package is available on request.