Alloy 43ph，Low expansion 43Ph Alloy Pipe，

British Specs:，American Specs:，German Specs:

Key Properties

Alloy 43ph (Low Expansion 43Ph Alloy Wire) and its various forms exhibit a unique set of properties that make them indispensable in applications demanding dimensional stability and reliability:

Mechanical Properties (room temperature, annealed condition):

Tensile strength: 450-580 MPa (65,300-84,100 psi)

Yield strength (0.2% offset): 150-250 MPa (21,800-36,300 psi)

Elongation (in 50 mm): 30-45% (good ductility, enabling complex forming, bending, and drawing into wire and thin forms)

Hardness: 120-160 HB (Brinell hardness, indicating good machinability and workability)

Thermal Properties (key for low expansion applications):

Coefficient of thermal expansion (CTE): Extremely low CTE of 4.0-5.0 μm/(m·K) over the temperature range of -50°C to 200°C (-58°F to 392°F), ensuring minimal dimensional changes with temperature fluctuations

Curie temperature: 230-250°C (446-482°F), below which the alloy retains its low expansion properties

Thermal conductivity: 16 W/(m·K) at 20°C (68°F), suitable for applications requiring controlled heat transfer

Specific heat capacity: 450 J/(kg·K) at 20°C (68°F)

Corrosion Resistance:

General corrosion resistance: Good resistance to atmospheric corrosion, freshwater, and mild industrial environments

Chemical resistance: Resistant to dilute acids, alkaline solutions, and organic chemicals; less suitable for strong oxidizing acids and saltwater

Wet corrosion: Resistant to oils, solvents, and mild detergents, ensuring durability in precision equipment

Oxidation resistance: Moderate resistance to oxidation in air up to 400°C (752°F), forming a thin oxide layer that prevents rapid degradation

Physical Properties:

Density: 8.1 g/cm³ (0.292 lb/in³)

Melting point: 1430-1470°C (2594-2678°F)

Modulus of elasticity: 150 GPa (21,800 ksi) at room temperature

Electrical resistivity: 0.55-0.65 μΩ·m at 20°C (68°F)

Product Forms

Alloy 43ph (Low Expansion 43Ph Alloy) is manufactured in a diverse range of forms to accommodate specialized industrial processes across aerospace, electronics, and precision engineering sectors:

Bar: Available as Round bar (diameters from 6 mm to 200 mm) and Flat bar (thickness 5 mm to 100 mm, width 15 mm to 500 mm), ideal for machining into precision components such as optical mounts, sensor housings, and aerospace hardware.

Ribbon: Thin, flat strips (thickness 0.05 mm to 1 mm, width 5 mm to 100 mm) used in thermostats, bimetallic strips, and precision electrical components requiring low expansion.

Wire: Low Expansion 43Ph Alloy Wire (diameters 0.05 mm to 8 mm) offers excellent flexibility and dimensional stability, making it suitable for thermocouple leads, precision springs, and wiring in high-precision instruments.

Rods: Solid cylindrical rods (diameters 3 mm to 50 mm) suitable for structural supports in optical systems, aerospace components, and precision machinery.

Tube and Pipe: Seamless options (outer diameter 5 mm to 150 mm, wall thickness 0.5 mm to 8 mm) for thermal management systems, sensor housings, and fluid transport in precision equipment.

Foil: Ultra-thin sheets (thickness 0.005 mm to 0.1 mm) used in lightweight bimetallic components, thermal shields, and precision electrical contacts.

Plate and Sheet: Flat forms (plate: thickness 4 mm to 80 mm; sheet: 0.2 mm to 4 mm) for fabricating optical benches, laser components, and aerospace structural parts requiring dimensional stability.

Strip: Narrow, flat strips (thickness 0.05 mm to 2 mm, width 10 mm to 200 mm) for precision manufacturing in thermostats, relays, and sensor components.

Forging Stock: Billets and ingots for hot forging into complex shapes such as aerospace brackets, optical mounts, and precision mechanical components.

Applications

The exceptional low thermal expansion properties of Alloy 43ph (Low Expansion 43Ph Alloy Wire) across its various forms make it a critical material in industries requiring dimensional stability and precision:

Aerospace and Aviation:

Aircraft instrumentation: Optical mounts, sensor housings, and precision brackets (from bar and plate) that maintain alignment across temperature extremes.

Aerospace structures: Components in jet engines and spacecraft (from forging stock and sheet) where dimensional stability under thermal cycling is critical.

Thermal management systems: Tubes and pipes for cooling systems in avionics, ensuring consistent flow rates despite temperature changes.

Electronics and Optics:

Optical equipment: Laser components, mirror mounts, and optical benches (from plate and bar) that maintain alignment in temperature-fluctuating environments.

Semiconductor manufacturing: Precision tools and fixtures (from sheet and rod) used in wafer processing, where dimensional stability ensures accurate patterning.

Electrical components: Thermostats, bimetallic strips, and relay contacts (from ribbon and strip) that respond reliably to temperature changes.

Precision Instrumentation:

Scientific instruments: Components for spectrometers, accelerometers, and navigation systems (from wire and bar) requiring high accuracy across temperature ranges.

Medical devices: MRI machine components, laser surgical tools (from foil and sheet), and precision sensors that maintain calibration in varying temperatures.

Metrology equipment: Calibration standards and measurement tools (from bar and rod) that provide consistent results regardless of ambient temperature.

Specialized Applications by Form:

Wire: Thermocouple leads in high-precision temperature sensors, precision springs in instruments, and wiring in electronics requiring minimal dimensional change.

Ribbon and Strip: Bimetallic strips in thermostats, electrical contacts in relays, and precision connectors in aerospace electronics.

Plate and Sheet: Optical benches, laser housings, and structural components in precision machinery.

Bar and Rod: Machined sensor housings, optical mounts, and fasteners in aerospace and scientific equipment.

In summary, Alloy 43ph (Low Expansion 43Ph Alloy Wire) — available in forms from Bar and Wire to Plate and Forging Stock — delivers exceptional low thermal expansion, good mechanical strength, and formability. Its diverse product forms enable tailored solutions across aerospace, electronics, and precision instrumentation sectors, establishing it as a critical material in applications demanding dimensional stability.

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 2771 gallon liquid totes Special package is available on request.