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Alloy 718 / Inconel 718 / N07718 / 2.4668
Inonel Alloy 718 is a high-quality, high-temperature alloy, designed and
developed specifically for operation at temperatures up to 980 ¡ã C (author and
developer Eiselstein). Almost immediately after its release, it began to be in
great demand, and already in the 70s of the last century in the USA it accounted
for more than 50% of the total gross production of industrial heat-resistant
alloys. To this day, Inconel 718 is considered one of the most demanded
materials of the Inconel group, the patent for it today belongs to the Special
Metals Corporation.
Russian analogue of inconel 718- §·§¯45§®§£§´§À§¢§² according to GOST 5632.
The unique formulation of Inconel 718 provides enhanced strength and corrosion
resistance, combined with simple machinability and easy weldability. Its main
advantages are resistance to corrosion damage in the areas of welded joints and
high tensile strength at temperatures up to 700 ¡ã C.
According to the NACE MR0175 standard, alloy 718 is regulated as type 4d, which
makes it possible to use it when exposed to different combinations of chlorides,
hydrogen sulfide with different concentrations (but with a yield point of 1034
MPa).
The first purpose of this alloy was to manufacture a special material for the
skin of supersonic aircraft.
In modern production, the alloy is actively used for the manufacture of parts of
gas turbines, elements and assemblies of rocket and aircraft engines (compressor
blades), and spacecraft. Inconel alloy 718 is indispensable for the creation of
nuclear reactors and is actively in demand in the petrochemical and gas-oil
industries.
An improved modification of Inconel 718 is Inconel alloy 718SPFTM, endowed with
high ductility (N0771).
Corrosion resistance
Due to its high chromium and molybdenum content, Nicrofer 5219 Nb has excellent
resistance to localized corrosion, such as pitting, in many environments, both
at high and low temperatures. Due to its high chromium content, Nicrofer 5219 Nb
also has a high resistance to stress corrosion cracking, making it one of the
outstanding materials for use in oilfield applications, H2S sour gas and marine
applications.
Nicrofer 5219 Nb is mainly used for temperatures up to 700 ¡ã C (1300 ¡ã F). Its
corrosion resistance up to 1000 ¡ã C (1830 ¡ã F) is remarkable compared to that of
other ¦Ã-phase-hardened superalloys.
Welding
Nicrofer 5219 Nb can be welded by all conventional welding methods:
non-consumable, consumable, hot-electrode, plasma, active gas, submerged arc and
arc welding. If gas-electric welding is used, the pulse technique is preferred.
The following welding consumable is recommended:
Stick electrodes:
NicroferS5219 FM718
op. no. 2.4667
SG-NiCr19NbMoTi
AWS A5.14: ERNiFeCr-2
BS 2901 Part 5: NA51
Main features and advantages of the alloy:
Good technological properties in the state of diffusion annealing;
Good mechanical short-term and long-term properties and high strength;
Good creep resistance at 700 ¡ã C;
Good corrosion resistance up to 1000 ¡ã C;
Excellent mechanical properties at low temperatures;
Excellent corrosion resistance at high and low temperatures as well as good
resistance to stress corrosion cracking and pitting;
Good weldability with arc and resistance welding without a tendency to weld
cracking.
Main areas of use:
With its high temperature strength up to 700 ¡ã C (1300 ¡ã F), excellent corrosion
resistance and good machinability, Nicrofer 5219 Nb has a wide range of
applications. It was originally used for turbine impellers in aircraft jet
engines, where creep strength and fatigue strength are critical.
Due to its properties, good machinability and cost-effectiveness, the material
is widely used in a wide variety of applications:
high-voltage rotating and non-rotating components in gas turbines and rocket
engines;
high strength screws, dowels and fasteners, components in nuclear reactors and
spaceships;
heat-resistant tools for tube presses.
Important new applications include pump shafts and other high-stress components
for offshore and offshore drilling rigs. Especially this alloy has proven to be
suitable for sour gas (H2S, CO2 and chloride) drilling rigs in oil and gas
production.
Various products are produced from this alloy according to ASTM standards:
B637 - Bars, forgings, forging;
B670 - flat products for high temperatures.
Other materials
Steel X1NiCrMoCuN25-20-7 - 1.4529
Steel 41Cr4KD - 1.7035
Steel C60D - 1.0610
Steel EN-JM1160
Steel 120 Cr 5 - 1.2059
Steel G-X 120 Mn
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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
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