Alloy 43ph，Low expansion 43Ph Alloy Bar(Round bar, Flat bar)，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 43PH / Low Expansion 43PH Alloy Bar** **Round Bar & Flat Bar - Premium Stock for High-Strength Precision Applications** **Alloy 43PH Bar** is a specialized precipitation-hardenable iron-nickel-cobalt alloy available in both round and flat bar configurations, engineered to deliver exceptional dimensional stability combined with superior mechanical strength. This advanced material maintains excellent low thermal expansion characteristics while achieving remarkable strength properties through controlled precipitation hardening heat treatment, making it ideal for structural components requiring both thermal stability and mechanical reliability in demanding environments. --- #### **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 nickel-cobalt balance ensures controlled thermal expansion, while titanium and aluminum additions enable precipitation hardening for enhanced mechanical properties in bar applications. --- #### **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 | Round Bar (Aged) | Flat Bar (Aged) | | :--- | :--- | :--- | | **Tensile Strength** | 185-225 ksi (1276-1551 MPa) | 180-220 ksi (1241-1517 MPa) | | **Yield Strength (0.2%)** | 175-205 ksi (1207-1413 MPa) | 170-200 ksi (1172-1379 MPa) | | **Elongation** | 8-12% | 10-15% | | **Reduction of Area** | 20-30% | 25-35% | | **Hardness** | HRC 40-46 | HRC 38-44 | | **Impact Toughness** | 25-40 ft-lb | 30-45 ft-lb | --- #### **4. Product Specifications & Applications** **Round Bar Applications:** - Aircraft structural components and mounting rods - Laser system structural shafts and guides - Semiconductor equipment guide rods - Precision instrument shafts and spindles - Aerospace alignment rods and fasteners **Flat Bar Applications:** - Optical mounting platforms and base plates - Machine tool structural elements and ways - Electronic package substrates and frames - Precision fixture components and brackets - Instrument frame structures and supports **Industry Applications:** * **Aerospace & Defense:** - Missile guidance system components - Satellite structural members - Avionics mounting platforms - Aircraft control system parts * **Precision Manufacturing:** - Coordinate measuring machine components - Optical comparator stages - Metrology equipment structures - Precision gauge fixtures * **Semiconductor & Electronics:** - Wafer handling system components - Vacuum chamber structural members - RF device mounting platforms - Clean room equipment frames * **Energy Sector:** - Turbine components - Nuclear instrument housings - Power generation equipment parts - Thermal management system components --- #### **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 **Product Specifications:** **Round Bar:** - **Diameter Range:** 0.125" to 8.000" (3.175 mm to 203.2 mm) - **Diameter Tolerance:** ±0.001" to ±0.010" - **Straightness:** 0.010" per foot maximum - **Surface Finish:** 32 μin RMS or better **Flat Bar:** - **Thickness Range:** 0.125" to 3.000" (3.175 mm to 76.2 mm) - **Width Range:** 0.500" to 12.000" (12.7 mm to 304.8 mm) - **Flatness:** 0.005" per inch maximum - **Surface Condition:** Cold drawn or hot rolled --- #### **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:** Best in solution treated condition - **Weldability:** Compatible with standard welding techniques - **Corrosion Resistance:** Good performance in most environments **Heat Treatment Specifications:** - **Solution Treatment:** 1650-1700°F (899-927°C) / 1 hour per inch - **Aging Treatment:** 900°F (482°C) for 8 hours, air cool - **Quenching:** Rapid air or oil quench - **Atmosphere Control:** Protective atmosphere recommended **Processing Guidelines:** - **Machining:** Use sharp tools with positive rake angles - **Heat Treatment:** Stress relieve at 425-540°C after heavy machining - **Forming:** Good cold working characteristics in annealed condition - **Surface Treatment:** Compatible with various plating processes **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all specified properties - **Non-Destructive Testing:** UT, MT, PT as required - **Dimensional Inspection:** Precision measurement capabilities - **Traceability:** Full material history documentation --- #### **Why Choose Our Alloy 43PH Bar Products?** * **Premium Quality:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Excellent dimensional accuracy and surface quality * **Technical Expertise:** Comprehensive heat treatment guidance * **Quality Assurance:** Full certification and traceability * **Global Compliance:** Meets international standards and specifications * **Proven Reliability:** Extensive track record in critical applications **Value-Added Services:** - Precision cutting to specified lengths - Custom machining capabilities - Heat treatment processing - Surface finishing services - Comprehensive certification packages **Contact our technical team** for detailed specifications, application engineering support, and material selection guidance. We provide complete solutions for your low expansion, high strength alloy bar requirements, ensuring optimal performance in your most demanding precision engineering applications.

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 2770 gallon liquid totes Special package is available on request.