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

Seamless Pipe (SMLS) & Welded Pipe• Seamless: Preferred for high-pressure, critical corrosion, and offshore applications.
• Welded: Cost-effective for large diameters and structural applications.

Seamless pipe is the benchmark for reliability in demanding services.

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%

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

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 pipe form.

Key Standards (Pipe)

Seamless Pipe: ASTM B444 / ASME SB-444 (Standard Specification for Ni-Cr-Mo-Columbium Alloy Pipe and Tube)
Welded Pipe: ASTM B705 / ASME SB-705 (Welded Pipe)

ASTM B444 is the primary specification for seamless pipe. ASTM B705 covers welded.

Common Sizes & Schedules

OD Range: 1/8" NPS to 24" NPS+
Wall Thickness: Sch 5S, 10S, 40S, 80S, 160, XXS (per ASME B36.19M)
Length: Random, Double Random, Cut to Length.

Widely available in a full range of standard pipe sizes and heavy-wall schedules.

Fittings & Fabrication

Compatible with ASTM B366 wrought fittings. Excellent weldability using matching filler metal (ERNiCrMo-3).

Forms complete, highly corrosion-resistant piping systems for critical processes.

Typical Applications

• Marine & Offshore: Seawater piping, risers, umbilicals, ballast systems.
• Chemical Processing: Reactor piping, heat exchanger tubes, pickling lines, acid recovery systems.
• Oil & Gas: Downhole tubing, wellhead components, sour service flowlines.
• Aerospace: Hydraulic lines, engine exhaust ducts, fire protection systems.
• Pollution Control: Flue gas desulfurization (FGD) scrubber spray headers, ducting.

The go-to alloy pipe for applications where extreme corrosion is the primary challenge, especially in chloride-bearing media.