Inconel 625 belongs to the group of nickel-chromium alloys with the addition
of niobium and molybdenum additives. Such a complex structural composition
contributes to a significant increase in the strength of the alloy, without the
need for its thermal strengthening.
The Russian analogue of Inconel 625 is KhN75MBTYu material in accordance with GOST 5632.
Products made of alloy 625 are capable of operating in wide temperature regimes - from minus to high, reaching 980 ¡ã §³. In addition, Inconel Alloy 625 has unique resistance to corrosive environments, especially in direct contact with acids. It is characterized by high resistance to gas corrosion damage (at high temperatures). The alloy is easily weldable of any type.
Density of alloy Inconel 625 (weight) - 8.44 g / cm3
Thermal properties N06625
In accordance with the provisions of the ANSI / NACE MR0175 standard, Inconel 625 is regulated as type 4d - annealed and cold worked materials, based on nickel. And it is a hard alloy intended for use in a wide range of equipment, units and parts.
Due to its composition, Inconel 625 N06625 is in demand and indispensable in modern production of the oil and gas, chemical industry, aviation, shipbuilding, instrument making, and when creating parts of reactors in the nuclear industry.
An improved modification of Inconel 625 is Inconel alloy 625LCF N06626, the main unique characteristic of which is fatigue strength under the influence of cyclical temperature drops reaching 650 ¡ã C.
Inconel 625 LCF is available in plates, fittings and tapes. Also rolled products from this alloy include Inconel 625 wire, Inconel 625 sheet, etc.
Optimum corrosion resistance is only observed when the material is provided for use in a clean, metallic luster condition. Nicrofer® 6020 hMo exhibits extreme corrosion resistance against a wide range of media;
excellent resistance to pitting and crevice corrosion in chloride-containing environments;
excellent resistance to chloride-induced stress corrosion cracking;
high resistance to corrosion from mineral acids such as nitric, phosphoric, sulfuric and hydrochloric; also from high concentrations of alkalis and organic acids, as well as under oxidizing and reducing conditions;
very good resistance to sea and brackish water, also at elevated temperatures;
high resistance to intercrystalline corrosion after annealing and welding;
high resistance to erosion corrosion.
The high carbon version is resistant to many corrosive gas atmospheres. He has:
good resistance to carburization and scale formation under static and variable conditions, suitable for use in air up to 1000 ¡ã C (1830 ¡ã F);
resistance to nitriding;
good resistance to halogens and hydrogen chloride.
Nicrofer 6020 hMo can be welded using all conventional welding methods: non-consumable, consumable electrode, hot-electrode, plasma, active gas, submerged arc and arc welding.
The following welding materials are recommended:
Nicrofer S6020-FM 625
Op material. No. 2.4831
Short designation SG-NiCr21Mo9Nb
Coated rod electrodes
Op.material. No. 2.4621
Short designation EL-NiCr20Mo9Nb
Nicrofer S / B 6020 / FM 625 / WS 625
Op.material No. 2.4831
Main features and advantages of the alloy:
Extremely resistant to pitting, crevice, erosion and intergranular corrosion;
Insensitivity to chloride-induced tensile stress corrosion cracking;
Good resistance to mineral acids such as nitric, phosphoric, sulfuric and hydrochloric acids;
Good resistance to alkalis and organic acids;
Good mechanical properties.
Main areas of use:
installations for the production of superphosphoric acid;
installations for the enrichment of radioactive waste;
production pipe systems and risers for oil production;
shipbuilding sea water pipelines;
expansion joints resistant against cracking corrosion;
wet flue gas cleaner;
flare pipes for burning in oil refineries;
expansion joints for hot exhaust gases;
boiler pipes in waste incineration plants;
hard facing by cladding in incinerators.
Various products are produced from this alloy according to ASTM standards:
B366 - fittings;
B443 - Plates, sheets, strips;
B444 - pipes;
B446 - rods;
B564 - forgings;
B704, B705 - welded pipes;
B751 - welded pipes;
B834 - pipe flanges, fittings, valves;
B924 - Seamless welded tubes for heat exchangers and condensers with integrated fins.
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