ISO/TR 15608 Material Group 46 such as alloy 617:
Nickel-chromium-cobalt alloys (Ni-Cr-Co) with Ni ≥ 45 % and Co ≥ 10 %
Features of Nickel-chromium-cobalt alloys such as Alloy 617
These alloys are solid-solution-strengthened nickel-cobalt-chromium-silicon alloys with outstanding resistance to various forms of high-temperature corrosion attack. They have an excellent resistance to sulfidation and chloride attack in both reducing and oxidizing atmospheres. The alloys also have exceptionally good resistance to oxidation, hot corrosion, carburisation, metal dusting, nitridation, and corrosion attack by low melting point compounds such as those formed by phosphorus, vanadium, and other impurities.
The combination of high strength and oxidation resistance at temperatures over 980°C makes Alloy 617 an attractive material for such components as ducting, components of power-generating plants, combustion cans, and transition liners in both aircraft and land-based gas turbines. That characteristic, combined with good resistance to oxidizing and carburizing atmospheres, makes the alloy especially suitable for long-term, high-stress use at elevated temperatures. Alloy 617 has excellent weldability.
Applications of Nickel-chromium-cobalt alloys
The alloys are especially suited for applications in high temperature corrosive environments generated by combustion of low grade fuels or processing of chemical feed stocks with corrosive contaminants such as sulfur, chlorine, fluorine, vanadium, phosphorus, and others. The alloys are capable of withstanding temperatures up to 1200 °C. It is widely used in recuperators, heat exchangers and waste heat recovery systems. Alloys are also suitable for utility boilers, sulfur plants, high-temperature furnaces, kilns, calciners, resource recovery units, cement kilns, pulp and paper recovery boilers, coal gasification systems, and fluidized-bed combustion systems.
Typical materials in group 46
| Name / Grade | Number | Standard | Product | Alloy/Trademark | Remarks |
|---|---|---|---|---|---|
| NiCr20Co18Ti – | 2.4632 N07090 | – – | – – | NIMONIC® Alloy 90 | EN 13445-10: PMA – |
| NiCo20Cr20MoTi – | 2.4650 N07263 | – – | – – | NIMONIC® Alloy 263 Nicrofer 5020CoTi | EN 13445-10: PMA – |
| NiCr20Co13Mo4Ti3Al – | 2.4654 N07001 | EN 10269 – | Fasteners/Bar – | HAYNES® Waspalloy alloy | EN 13445-2/-10 – |
| NiCr23Co12Mo – – – – | 2.4663 N06617 N06617 N06617 N06617 | EN 10302 ASTM B-166 ASTM B-167 ASTM B-168 ASTM B-564 | – Bar Smls. pipe & tube Plate Forging | INCONEL® Alloy 617 Nicrofer 5220Co | EN 13445-10: PMA ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
| NiCr25Co20TiMo | 2.4878 | – | – | – | – |
| NiCo29Cr28Si – – – – – – – | 2.4880 N12160 N12160 N12160 N12160 N12160 N12160 N12160 | – ASTM B-366 ASTM B-435 ASTM B-564 ASTM B-572 ASTM B-619 ASTM B-622 ASTM B-626 | – Fittings Plate Forging Rod Welded pipe Smls. pipe & tube Welded tube | – HAYNES® HR-160® alloy | – ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |