Inconel718 alloy is a precipitation hardening nickel-chromium-iron alloy containing niobium and molybdenum. It has high strength, good toughness and corrosion resistance in high and low temperature environments below 650 °C. The state may be solution treated or precipitation hardened.
Product Features
Ease of processing
High tensile strength, fatigue strength, creep strength and rupture strength at 700ºC
High oxidation resistance at 1000ºC
Stable chemical properties at low temperature
Good welding performance
Application field
Due to its high temperature strength at 700°C, excellent corrosion resistance and easy processability, it can be widely used in various high-demand occasions. Steam turbine Liquid fuel rocket
Cryogenic engineering
Acid environment
Nuclear Engineering
chemical composition
Similar grades
GH4169, GH169 (China), NC19FeNb (France), NiCr19Fe19Nb5, Mo3 (Germany), NA 51 (UK) Inconel718, UNS NO7718 (USA) NiCr19Nb5Mo3 (ISO)
chemical composition
Ni Cr Fe C Mn Si Mo Cu Co Al Ti Nb B P S
minimum 50 17 2.8 0.2 0.65 4.75 0
maximum 55 21 margin 0.08 0.35 0.35 3.3 0.3 1.0 0.8 1.15 5.50 0.006 0.01 0.01
physical properties
Density ρ=8.24g/cm3
Melting temperature range 1260~1320ºC
Machining and Heat Treating
Inconel718 alloy is a difficult-to-machine material in the field of machining.
warm up
The workpiece must be surface cleaned before and during heating to keep the surface clean. If the heating environment contains sulfur, phosphorus, lead or other low melting point metals, Inconel718 alloy will become brittle. Impurities originate from marked paint, chalk, lubricating oil, water, fuel, etc. The sulfur content of fuel should be low, for example, the impurity content of liquefied gas and natural gas should be less than 0.1%, the sulfur content of city gas should be less than 0.25g/m3, and the sulfur content of petroleum gas should be less than 0.5%.
The heated electric furnace should preferably have a more accurate temperature control ability, the furnace gas must be neutral or weakly alkaline, and the fluctuation of the furnace gas composition in oxidizing and reducing properties should be avoided.
Thermal processing
The suitable hot working temperature of Inconel718 alloy is 1120-900ºC. The cooling method can be water quenching or other rapid cooling methods. After hot working, it should be annealed in time to ensure the best performance. During hot processing, the material should be heated to the upper limit of the processing temperature. In order to ensure the plasticity during processing, the final processing temperature when the deformation amount reaches 20% should not be lower than 960 °C.
cold working
Cold working should be carried out after solution treatment. The work hardening rate of Inconel718 is greater than that of austenitic stainless steel, so the processing equipment should be adjusted accordingly, and there should be an intermediate annealing process during cold working.
heat treatment
Different solution treatment and aging treatment processes will result in different material properties. Due to the low diffusion rate of the γ" phase, the best mechanical properties of Inconel718 alloy can be obtained by long-term aging treatment.
polished
The oxides near the welds of Inconel718 workpieces are more difficult to remove than those of stainless steel. They need to be polished with a fine abrasive belt. Before pickling in a mixed acid of nitric acid and hydrofluoric acid, sandpaper should also be used to remove oxides or salt bath pretreatment. deal with.
machining
Machining of Inconel718 needs to be carried out after solution treatment, taking into account the work hardening of the material. Unlike austenitic stainless steel, Inconel718 is suitable for low surface cutting speeds.
welding
The precipitation hardening Inconel 718 alloy is very suitable for welding and has no tendency to crack after welding. Solderability, ease of processing, and high strength are several advantages of this material.
Inconel718 is suitable for arc welding, plasma welding, etc. Before welding, the surface of the material should be clean, free of oil stains, chalk marks, etc., and the bright metal should be polished within 25mm around the weld.
Recommended Soldering Materials for Inconel 718:
GTAW/GMAW
Nicrofer S 5219
W.-Nr. 2.4667
SG-NiCr19NbMoTi
AWS A 5.14 ERNiFeCr-2
BS 2901 Part 5: NA 51
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