Alloy 43ph，Low expansion 43Ph Alloy ，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 43PH / Low Expansion 43PH Alloy** **Precipitation-Hardenable Low Expansion Alloy for High-Strength Applications** **Alloy 43PH** is an advanced iron-nickel-cobalt precipitation-hardenable alloy specifically engineered to combine excellent low thermal expansion characteristics with high strength properties. This unique alloy maintains dimensional stability across temperature variations while achieving superior mechanical properties through precipitation hardening heat treatment, making it ideal for applications requiring both thermal stability and structural integrity. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Significance | | :--- | :--- | :--- | | **Nickel (Ni)** | 42.0 - 43.0 | Primary expansion control | | **Cobalt (Co)** | 5.0 - 6.0 | Precipitation hardening control | | **Titanium (Ti)** | 2.0 - 2.5 | Primary strengthening element | | **Aluminum (Al)** | 0.5 - 0.8 | Secondary strengthening | | **Iron (Fe)** | Balance | Matrix formation | | **Manganese (Mn)** | 0.50 max | Deoxidation control | | **Silicon (Si)** | 0.30 max | Deoxidation agent | | **Carbon (C)** | 0.05 max | Weldability and toughness | | **Chromium (Cr)** | 0.20 max | Surface stability | | **Copper (Cu)** | 0.20 max | Minor alloying element | * **Precision Engineering:** The optimized composition provides controlled thermal expansion while enabling precipitation hardening through titanium and aluminum additions for enhanced strength. --- #### **2. Physical Properties** | Property | Value | Condition | | :--- | :--- | :--- | | **Density** | 8.10 g/cm³ | 20°C | | **Melting Point** | 1430°C | Approximate | | **Thermal Conductivity** | 15.2 W/m·K | 20°C | | **Mean CTE (20-300°C)** | 5.0-6.0 × 10⁻⁶/°C | - | | **Specific Heat Capacity** | 450 J/kg·K | 20°C | | **Electrical Resistivity** | 85 μΩ·cm | 20°C | | **Modulus of Elasticity** | 155 GPa | 20°C | | **Curie Temperature** | 250°C | - | --- #### **3. Mechanical Properties** | Property | Annealed Condition | Aged Condition (900°F/8hr) | | :--- | :--- | :--- | | **Tensile Strength** | 80-100 ksi (552-690 MPa) | 180-220 ksi (1241-1517 MPa) | | **Yield Strength (0.2%)** | 45-65 ksi (310-448 MPa) | 170-200 ksi (1172-1379 MPa) | | **Elongation** | 25-35% | 8-15% | | **Reduction of Area** | 50-60% | 25-35% | | **Hardness** | HRB 85-95 | HRC 38-45 | | **Fatigue Strength** | 40-50 ksi (276-345 MPa) | 75-85 ksi (517-586 MPa) | --- #### **4. Product Specifications & Applications** **Available Product Forms:** - Bar and Rod: 0.125" to 6.000" diameter - Sheet and Strip: 0.001" to 0.125" thickness - Plate: 0.126" to 2.000" thickness - Wire: 0.005" to 0.250" diameter - Forgings and Custom Components **Primary Applications:** * **Aerospace & Defense:** - Aircraft structural components - Missile guidance systems - Satellite structural elements - Avionics mounting platforms * **Precision Instrumentation:** - Laser system components - Optical mounting structures - Measuring equipment frames - Precision gauge blocks * **Semiconductor Manufacturing:** - Wafer handling components - Vacuum chamber parts - Etching equipment frames - Inspection system mounts * **Energy Sector:** - Turbine components - Nuclear instrument housings - Power generation equipment - Thermal management systems **Specialized Applications:** - Cryogenic equipment components - High-temperature fixtures - Optical alignment structures - Medical imaging equipment - Research apparatus --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM F30:** Standard Specification for Iron-Nickel-Cobalt Alloys - **UNS K94680:** Unified Numbering System Designation - **AMS 7726:** Aerospace Material Specification - **MIL-DTL-23488:** Military Specification - **ISO 4950:** High Yield Strength Steel - **DIN 17471:** German Industrial Standard - **JIS C2532:** Japanese Industrial Standard **Heat Treatment Specifications:** - **Solution Treatment:** 1650-1700°F (899-927°C) - **Aging Treatment:** 900°F (482°C) for 8 hours - **Cooling Rate:** Air cool or faster - **Atmosphere Control:** Protective atmosphere recommended --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Benefits:** - **High Strength-to-Weight Ratio:** Superior mechanical properties - **Excellent Thermal Stability:** Maintains dimensions under thermal cycling - **Good Machinability:** Suitable for precision machining - **Weldability:** Compatible with standard welding techniques - **Corrosion Resistance:** Good performance in most environments **Heat Treatment Characteristics:** - **Solution Treating:** Achieves optimal condition for machining - **Precipitation Hardening:** Develops high strength properties - **Stability:** Minimal distortion during heat treatment - **Consistency:** Repeatable results batch-to-batch **Processing Guidelines:** - **Machining:** Best performed in solution-treated condition - **Forming:** Good cold working characteristics - **Welding:** Use matching filler metals - **Stress Relieving:** Recommended after severe machining **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all properties - **Non-Destructive Testing:** UT, RT, MT, PT as required - **Heat Treatment Verification:** Full documentation - **Traceability:** Complete material history --- #### **Why Choose Alloy 43PH?** * **Dual Capability:** Combines low expansion with high strength * **Proven Performance:** Extensive application experience * **Technical Support:** Comprehensive engineering assistance * **Quality Commitment:** Stringent quality control standards * **Global Certification:** Meets international specifications * **Reliable Supply:** Consistent material availability **Industry Certifications:** - ISO 9001:2015 Quality Management System - AS9100 Aerospace Quality System - NADCAP accredited processing - OHSAS 18001 Health and Safety Management **Contact our technical team** for comprehensive technical data sheets, application assistance, and material selection guidance. Our experts are ready to provide solutions for your most demanding low expansion, high strength alloy 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 2768 gallon liquid totes Special package is available on request.