Alloy 617 belongs to the group of nickel-chromium alloys with additions of molybdenum and cobalt.
The combination of these metals provides the alloy with excellent performance, strength and resistance to corrosion. In addition, it is neutral to the effects of a large number of chemicals and aggression, it lends itself well to processing and welding.
Inconel 617 analog - material 56 according to GOST 5632.

Nickel-chromium-cobalt-molybdenum material has unique characteristics, especially high resistance to oxidation processes at high temperatures. And the introduction of molybdenum and cobalt into the alloy provides it with good hardness, machinability and weldability (using any types of welding).

The scope of the alloy is very wide - elements of combustion chambers of gas turbines, liners and adapters, pipes and fittings for pipelines transporting aggressive liquids and gases, heat exchangers. This material is actively used in the petrochemical and oil and gas industries.
Inconel 617 is in demand for the production of special equipment, units for the processing of nitric acid and other acids.
Corrosion resistance
Nicrofer 5520 Co exhibits excellent high temperature corrosion resistance against oxidation and carburization under thermally constant or variable conditions up to 1100 C (2000T). These properties, combined with extreme toughness, make the alloy suitable for high temperature applications.
Nicrofer 5520 Co can be welded to similar and many other metals using conventional welding methods. This includes the following types: welding, consumable electrode, plasma, electron beam and electric welding. In gas-electric welding, the use of pulse technology is preferable.
Welding rods
Nicrofer S5520-FM 617 (Order No. 2.4627)
Wire electrodes
AWSA5.14: ERNiCrCoMo-1
DIN EN ISO 18274:
S Ni 6617 (NiCr22Co12Mo)
Rod electrodes
op. no. 2.4628
AWSA5.11: ENiCrCoMo-1
DIN EN ISO 14172:
ENi6617 (NiCr22Co12Mo)
Main features and advantages of the alloy:
Good short-term and long-term mechanical properties up to 1100 C (2000 F);
Excellent resistance to oxidation up to 1100 C (2000 F);
Excellent resistance to carburization up to 1100 C (2000 F);
Good weldability.
Main areas of use:
Components for stationary and flying gas turbines such as combustion chambers and other parts in high temperature areas;
Air heaters;
Furnace parts and steel pipes;
High temperature heat exchangers;
Gas cooled high temperature reactors, especially for helium / helium heat exchangers in high temperature areas using nuclear process heat (PNP);
Components for plants in the chemical industry (CPI), eg styrene production, coils in the petrochemical industry.
Various products are produced from this alloy according to ASTM standards:
B166 - circles, rods, wire;
B167 - seamless pipes;
B168 - plates, sheets, strips;
B366 - fittings;
B546 - welded pipes;
B564 - forgings;
B924 - Seamless welded tubes for heat exchangers and condensers with integrated fins.
Other materials

Steel 316L
Steel DD14 - 1.0389
Steel Fe 360 ​​C - 1.0114
Steel P265T1 - 1.0258

Steel B500B - 1.0439
Steel PH 122 - 1.4939
Steel A403 Grade WPS31725 / SA403 Grade WPS31725 / CRS31725 / S31725

Inconel 625 / N06625 / 2.4856   Inconel 601 / N06601 / 2.4851   Inconel 718 / N07718 / 2.4668    Inconel 690 / N06690 / 2.4642

Inconel 617 / N06617 / 2.4663   Inconel X-750 / N07750 / 2.4669  Inconel 600 / N06600 / 2.4816    1.4876 / 1.4958

​​Incoloy 800HT / ​​N08811 / 1.4959     Incoloy 825 / N08825 / 2.4858   Incoloy 800H / N08810 / 1.4958     Incoloy 20 / N08020 / 2.4660

Incoloy 925 / UNS N09925            Hastelloy B-2 / N10665 / 2.4617   Hastelloy C-276 / N10276 / 2.4819   Hastelloy C-22 / N06022 / 2.4602

Hastelloy B-3 / UNS 10675 / 2.4600       Hastelloy C-4 / N06455 / 2.4610    Hastelloy X / N06002 / 2.4665        Monel 400 / UNS N04400 / 2.4360

 Monel K-500 / N05500 / 2.4375      Monel R-405 / N04405