Material Family

Nickel-Chromium-Molybdenum-Niobium Superalloy (Solid-Solution & Niobium Strengthened)

Niobium (Nb) provides significant strengthening without precipitation hardening, offering stability.

Common Designations

UNS N06625, Inconel 625, EN 2.4856, W.Nr. 2.4856, NCF 625

The global standard for extreme corrosion resistance and high strength.

Chemical Composition (Typical wt.%)

Ni: ≥ 58.0 (Balance)
Cr: 20.0 - 23.0
Mo: 8.0 - 10.0
Nb (+Ta): 3.15 - 4.15
Fe: ≤ 5.0
Al: ≤ 0.40
Ti: ≤ 0.40
C: ≤ 0.10

Molybdenum (Mo) provides resistance to reducing acids and pitting. Niobium (Nb) imparts strength and stabilizes against sensitization.

Mechanical Properties (Annealed Plate)

Tensile Strength (Rm): 830 - 1030 MPa
Yield Strength (Rp0.2): 415 - 690 MPa
Elongation (A): 30 - 55%

Noticeably higher strength than Inconel 600/601 at all temperatures due to niobium strengthening.

Physical Properties

Density: 8.44 g/cm³
Melting Range: 1290 - 1350 °C
Max Continuous Service Temp: ~1000°C (1832°F) for oxidation resistance.

Maintains excellent mechanical properties over a very wide temperature range.

Key Performance Attributes

• Exceptional Corrosion Resistance (pitting, crevice, stress corrosion cracking)
• Excellent Resistance to A Wide Range of Acids, Salts, and Sea Water• High Fatigue Strength & Good Fabricability• Resistance to Chloride-Ion Stress-Corrosion Cracking

The go-to alloy for combating the most aggressive chemical and marine environments.

Key Standards (Plate)

ASTM B443 / ASME SB-443, AMS 5599 (Aerospace), DIN 2.4856

ASTM B443 is the primary specification for plate, sheet, and strip.

Form Availability

Plate, Sheet, Bar, Wire, Pipe, Tube, Forging Stock

Widely available; excellent weldability for complex fabrications.

Typical Applications

• Marine & Sea Water Components (propeller blades, submarine fittings)
• Chemical Processing Reactors, Vessels, & Piping
• Aerospace Ducting, Engine Exhaust Systems
• Pollution Control & Flue Gas Desulfurization Systems
• Oil & Gas Downhole & Wellhead Components

The universal solution for applications where extreme corrosion is the primary challenge.