What Sets Inconel 625 Wire Apart
Inconel 625 wire is a nickel-chromium-molybdenum alloy with niobium addition that delivers high strength without precipitation hardening treatments . The solid-solution effects of molybdenum and niobium on the nickel-chromium matrix provide the mechanical properties that make this wire suitable for demanding applications ranging from cryogenic temperatures up to 982°C (1800°F) .
Unlike sheet or plate products that are typically evaluated by flatness, surface finish, and dimensional consistency, wire products present different challenges. Drawing and rolling processes work-harden the material substantially-cold-drawn Inconel 625 can reach microhardness of 522 HV0.5 with elongation dropping to just 4.37% . This work-hardening behavior is critical to understand because it affects how the wire performs in spring winding, fastening, and welding applications.
Technical Specifications
| Item | Specification |
| Standard | ASTM B446, AMS 5666 |
| Diameter Range | 0.5mm – 12.7mm (0.020″ – 0.500″) Custom diameters available on request |
| Mechanical Properties | Annealed: Tensile 830-1100 MPa, Yield 415-620 MPa, Elongation 30-45% Spring Temper: Tensile 1380-1655 MPa, Yield 1205-1515 MPa, Elongation 4-8% Hardness: Annealed 30-35 HRC / Spring Temper 42-48 HRC |
| Surface Finish | Bright (standard), pickled, or coated (copper/lubricant) |
| Item | Value |
| Nickel (Ni) | 58.0% min (balance) |
| Chromium (Cr) | 20.0 – 23.0% |
| Molybdenum (Mo) | 8.0 – 10.0% |
| Niobium+Tantalum (Nb+Ta) | 3.15 – 4.15% |
| Iron (Fe) | 5.0% max |
| Cobalt (Co) | 1.0% max |
| Manganese (Mn) | 0.50% max |
| Silicon (Si) | 0.50% max |
| Aluminum (Al) | 0.40% max |
| Titanium (Ti) | 0.40% max |
Key Properties That Drive Specification
- Corrosion Resistance
The high molybdenum content provides exceptional resistance to pitting and crevice corrosion, making Inconel 625 wire suitable for seawater applications . The alloy is essentially immune to chloride-ion stress-corrosion cracking . This is particularly important for wire rope used in mooring cables, submarine components, and undersea communication cable sheathing .
- Fatigue Strength
Inconel 625 offers good fatigue strength and stress-corrosion cracking resistance to chloride ions. The niobium addition helps prevent creep under applied stress at elevated temperatures . This makes it suitable for flexure devices, bellows, and spring applications where cyclic loading is expected .
- Non-Magnetic Properties
The alloy maintains essentially non-magnetic properties across its operating temperature range, which is relevant for instrumentation and underwater applications .
Typical Applications
- Springs and Seals
- Welding Filler Metal
- Aerospace Components
- Marine Hardware
- Nuclear Reactor Components
- Additive Manufacturing
Our Strengths
- Multiple Temper Conditions
Spring performance depends heavily on temper. We supply annealed wire (830-1100 MPa) for forming, and spring temper wire (1380-1655 MPa) for finished springs. If you need a specific tensile range for your coiler, we can supply accordingly.
- Flexible Spool Sizes
Samples, repair quantities, or production runs – we can accommodate. Standard spool weights from 1 kg sample spools to 100+ kg production spools.
- In-House Drawing Capability
Need a non-standard diameter not listed in our catalog? We have wire drawing capability to produce custom diameters from 0.5mm up to 12.7mm. Surface finish options include bright, pickled, and coated.
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