1. Equivalent Grades Across Standards
- UNS: N06625
- EN/W.Nr.: 2.4856
- GB: NS3306
- ASTM B443 / AMS 5666
- DIN: NiCr22Mo9Nb
2. Chemical Composition (wt%, typical)
Cr: 20.0~23.0%, Mo: 8.0~10.0%, Nb+Ta: 3.15~4.15%, C ≤0.10%, Fe ≤5.0%, Co ≤1.0%, Ti ≤0.40%, Al ≤0.40%, Mn ≤0.50%, Si ≤0.50%, P≤0.015%, S≤0.015%, Nickel as balance.
3. Production Process
3.1 Smelting & Ingot Casting
Raw materials are melted via VIM+VAR vacuum double smelting to guarantee homogeneous microstructure and low impurity content, then cast into alloy ingots.
3.2 Hot Working
Ingots are heated to 1120~1200℃, followed by hot forging and hot rolling into wire rod blanks.
3.3 Multi-pass Cold Drawing
Pickling for oxide removal → successive cold drawing to reach specified wire dimension with intermediate stress-relief annealing as needed.
3.4 Final Heat Treatment & Finishing
Continuous protective-atmosphere solution annealing → surface finishing, dimensional inspection, electrical & mechanical testing → spooling and packaging.
4. Product Characteristics & Physical Properties
Mechanical Properties (Solution Annealed Condition)
Tensile strength ≥830 MPa, Yield strength ≥415 MPa, Elongation ≥30%.
Physical Parameters
Density: 8.44 g/cm³; Melting range: 1290~1350℃; Low thermal expansion coefficient, excellent thermal stability at high temperatures.
Core Advantages
- Exceptional resistance to pitting, crevice corrosion, chloride stress corrosion cracking and various acid/alkali corrosive media.
- Outstanding high-temperature tensile strength, creep resistance and oxidation performance up to 980℃ continuous service.
- Superior weldability, formability and fatigue resistance; stable performance under alternating high-low temperature and harsh marine & chemical environments.
5. Main Applications
- Aerospace Industry: Aircraft engine exhaust components, turbine sealing wire, rocket engine auxiliary parts.
- Petroleum & Offshore Engineering: Subsea downhole control cable, high-pressure instrument tubing, seawater corrosion-resistant spring wire.
- Chemical & Environmental Equipment: High-temperature corrosion-resistant filler wire, chemical reactor internal accessories, flue gas desulfurization parts.
- Nuclear & Precision Equipment: Nuclear reactor auxiliary components, medical equipment alloy wire, high-performance welding filler wire.
