Material Family

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

Distinguished by its high molybdenum and niobium content for unparalleled corrosion resistance and strength.

Common Forms (Bar)

Hot Finished, Forged, or Cold Finished Rounds, Hexagons, Squares, Rectangles. Also supplied as Billet for forging.

Available in a wide range of diameters and cross-sections. Forged bar offers superior grain structure for critical parts.

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
C: ≤ 0.10

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

Mechanical Properties (Annealed, Room Temp)

Tensile Strength (Rm): 830 - 1030 MPa
Yield Strength (Rp0.2): 415 - 690 MPa
Elongation (A): 30 - 55%
Hardness: Typically 95-110 HRB

Noticeably higher strength than Inconel 600/601 at all temperatures. Excellent for high-stress components.

Physical Properties

Density: 8.44 g/cm³
Melting Range: 1290 - 1350 °C
Max Continuous Service Temp: ~1000°C (1830°F) for oxidation resistance.

Maintains excellent mechanical properties over a very wide temperature range.

Key Corrosion Resistance

• Exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride solutions.

• Excellent resistance to a wide range of acids, alkalis, and salts, including seawater, sulfuric, and phosphoric acids.

• Good oxidation resistance at high temperatures.

The universal solution for combating the most aggressive chemical and marine environments in bar form.

Key Standards (Bar)

ASTM B446 / ASME SB-446 (Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy Rod and Bar), AMS 5666 (Aerospace)

ASTM B446 is the primary specification for bar products.

Common Sizes & Conditions

Diameter/Thickness: 5mm (0.2") up to 500mm (20")+ for forged rounds.
Condition: Annealed (Solution Annealed), Hot Finished, or Cold Drawn. Can be supplied in strain-hardened tempers.

The Annealed condition is standard for most machining. Cold drawn bar offers better surface finish and tighter tolerances.

Machinability & Fabrication

Machinability Rating: ~30% (slightly better than 600/601 due to higher strength reducing gumminess). Still work-hardens; requires rigid setups, positive rake carbide tools, and heavy, continuous feeds.
Weldability: Excellent, using matching filler metal (ERNiCrMo-3).

Machining is challenging but manageable with correct parameters. Post-machining stress relief may be needed for complex parts.

Typical Bar Applications

• Marine & Offshore: Shafts, valve stems, fasteners, pump components for seawater systems.
• Chemical Processing: Agitator shafts, mixer blades, reactor internals, valve trim for aggressive media.
• Aerospace: Engine mounts, fasteners, exhaust components, landing gear parts.
• Oil & Gas: Downhole tool components, wellhead parts, non-magnetic drill collars.
• Power Generation: Turbine blades, heat exchanger parts, scrubber components.

The go-to alloy bar for manufacturing high-integrity parts for the most corrosive and high-strength environments.