Precision Alloys

Precision alloys are functional metallic materials engineered to exhibit specific physical responses to external magnetic fields, temperature fluctuations, electrical currents, or mechanical stress. Unlike structural alloys, precision alloys demand extreme chemical purity, uniform crystal orientation, and specialized final heat treatment to stabilize functional parameters such as magnetic permeability, thermal expansion coefficient, elastic modulus, and electrical resistivity.

Target Audiences & Functional Categorie

1. Controlled & Low Expansion Alloys

Customer Pain Points: Thermal mismatch causing glass-to-metal cracking; thermal drift distorting laser optics, satellite cameras, and LNG cryogenic measurement structures.

Key Grades:

Invar 36 (UNS K93600 / 4J36): Ultra-low coefficient of thermal expansion (CTE) near zero between -250°C and +200°C.

Kovar Alloy (UNS K94610 / 4J29): Expansion profile strictly matched with borosilicate hard glass and alumina ceramics.

Alloy 42 (4J42) & Super-Invar: Tailored linear expansion coefficients for integrated circuit leadframes and shadow masks.

Typical Applications: Hermetic microelectronic packages, cryogenic LNG tanks, laser cavity structural rods, telescope mounts, and satellite frame components.

2. Soft Magnetic Alloys

Customer Pain Points: High core loss, magnetic saturation distortion, and electromagnetic interference (EMI) disrupting sensitive electronics.

Key Grades:

Permalloy 80 / 1J79 / 1J85 (High Permeability): Initial permeability (μ0) up to 80,000–120,000, extremely low coercive force (Hc).

Permalloy 50 / 1J50 (High Saturation): High saturation magnetic induction (Bs ≥ 1.5 T) for miniaturized magnetic cores.

Mu-Metal & Co-Fe High Saturation Alloys (1J22 / Hiperco 50): Maximum magnetic saturation up to 2.4 T.

Typical Applications: Multi-layer magnetic shielding enclosures, current transformer cores, magnetic sensor probes, audio transformers, and relay cores.

3. Elastic & Constant Modulus Alloys

Customer Pain Points: Temperature-induced frequency drift, elastic hysteresis, and mechanical fatigue in resonance sensors and balance springs.

Key Grades:

Ni-Span-C® 902 (UNS N09902 / 3J53): Constant thermo-elastic coefficient (zero thermal frequency drift) across -45°C to +65°C.

High-Elastic Springs Alloys (3J1 / 3J21 / Elgiloy): Ultra-high yield strength, fatigue endurance, and non-magnetic spring behavior.

Typical Applications: Aerospace mechanical gyroscopes, tuning-fork resonance sensors, altimeter aneroid capsules, watch balance springs, and precision load cells.

4. Precision Resistance & Thermoelectric Alloys

Customer Pain Points: Electrical resistance drifting with temperature variations, high thermoelectric potential against copper, and oxidation at high working temperatures.

Key Grades:

Manganin (6J12 / 6J13): Near-zero temperature coefficient of resistance (TCR), ideal for DC current measurement.

Constantan (6J40): Stable resistivity, high thermoelectric EMF against copper for thermocouples.

Karma Alloy (6J20): High resistivity with ultra-low TCR over extended temperature ranges.

Nichrome Series (Cr20Ni80 / Nichrome V): High operating temperature limit (up to 1200°C) with exceptional oxidation resistance.

Typical Applications: Standard resistors, current shunts, strain gauges, laboratory heating elements, and industrial thermocouple compensation wires.

Available Product Forms & Supply Specifications

Precision Cold-Rolled Strips & Foils: Thickness 0.02 mm – 3.0 mm; Width 5 mm – 350 mm (Slit edges, burr-free, bright annealed or cold-worked tempers).

Ultra-Fine & Drawn Wires: Diameter 0.03 mm – 8.0 mm (Spool packaged, bright surface, uniform tension).

Forged & Peeled Bars: Diameter 6 mm – 200 mm for machining precision flanges and magnetic cores.

Stamped & Etched Components: Laser-cut magnetic shielding cans, etched leadframe preforms, and custom-formed deep-drawn caps.

Core Metallurgical Highlights 

Ultra-Tight Chemical Tolerances: Alloying elements (such as Ni content in Invar ±0.2%) are kept strictly within narrow boundaries to avoid phase transformation points shifting.

High Cleanliness Melting: Vacuum induction melting eliminates gas pores and non-metallic inclusions, ensuring high surface mirror polish and zero pinhole leakage in foil stamping.

Controlled Magnetic/Atmospheric Annealing: We provide pure dry-hydrogen magnetic annealing services (dew point < -60°C, 1100°C–1150°C) to fully release residual stresses and achieve optimum physical properties.