Material Family

Nickel-Chromium-Iron-Aluminum Superalloy (Solid-Solution Strengthened)

Distinguished by its aluminum content, which enables superior high-temperature oxidation resistance.

Common Forms

Seamless Pipe (SMLS) & Welded Pipe

• Seamless: Preferred for high-integrity, high-temperature structural applications.
• Welded: Cost-effective for large diameters and non-critical thermal cycling applications.

Seamless pipe offers the most reliable performance under severe thermal cycling.

Chemical Composition (Typical wt.%)

Ni: 58.0-63.0 (Balance)
Cr: 21.0-25.0
Fe: ~14.2
Al: 1.0-1.7
C: ≤ 0.10

High Chromium & intentional Aluminum form a stable, protective alumina (Al₂O₃) scale at extreme temperatures.

Mechanical Properties (Annealed, Room Temp)

Tensile Strength (Rm): 655 - 895 MPa
Yield Strength (Rp0.2): 275 - 585 MPa
Elongation (A): 30 - 45%

Offers higher typical strength than Inconel 600, especially at elevated temperatures.

Physical Properties

Density: 8.11 g/cm³
Melting Range: 1360 - 1410 °C
Max Continuous Service Temp: 1250°C (2282°F) in oxidizing atmospheres.

Optimized for maximum temperature capability and thermal cycling resistance.

Key Performance Attributes

• Outstanding Oxidation & Carburization Resistance in furnace atmospheres.
• Excellent Thermal Fatigue & Creep Rupture Strength for cyclic heating/cooling.
• Good resistance to sulfur-containing atmospheres and chloride environments at high temperatures.

The premier alloy for the most severe, high-temperature, oxidizing, and cyclic heating applications in pipe form.

Key Standards (Pipe)

Seamless Pipe: ASTM B167 / ASME SB-167 (Grade UNS N06601)
Welded Pipe: ASTM B516 / ASME SB-516, ASTM B517 / ASME SB-517 (Welded, UNS N06601)

Procured under the same ASTM standards as Inconel 600 pipe, but to the N06601 composition.

Common Sizes & Schedules

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

Available in standard piping schedules. Heavy walls (SCH 80, 160) are common for radiant tubes and structural supports.

Fittings & Fabrication

Compatible with ASTM B366 wrought fittings. Good weldability using filler metal ENiCrFe-2 or ERNiCr-3.

Can be fabricated into complete high-temperature piping and structural systems.

Typical Applications

• Industrial Furnaces: Radiant tubes, retorts, muffles, thermocouple protection sheaths, fan shafts.
• Heat Treatment: Roller hearth furnace rolls, annealing covers, basket frames.
• Power Generation: Combustion cans, burner nozzles, flare tips.
• Chemical Processing: Catalyst support grids, reactor internals for high-temperature processes.

The dominant material for high-temperature furnace piping and internal components requiring long-term stability.