Inconel 718 Tee Ni-Cr-Fe Alloy With High-Temperature Strength
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Inconel 718 Tee Ni-Cr-Fe Alloy With High-Temperature Strength
Inconel 718 tee is a high-performance nickel-based alloy pipe
fitting that plays a crucial role in extreme working
conditions. I. Material Basis: Properties of Inconel 718 AlloyInconel 718 is a precipitation-hardening nickel-chromium-iron alloy (UNS N07718). It features a high nickel content (50 - 55%), high
chromium content (17 - 21%), and high niobium content (4.75 -
5.5%), along with elements such as molybdenum (2.8 - 3.3%) and
titanium (0.65 - 1.15%):
1.Matrix Strengthening: Nickel forms a face-centered cubic austenitic matrix, ensuring high-temperature toughness and providing an antioxidant base. 2.Precipitation Strengthening: Niobium and titanium form γ′′ (Ni₃Nb) and γ′ (Ni₃(Al,Ti)) strengthening phases. After aging heat treatment, they significantly enhance strength and creep resistance. 3.Corrosion Resistance Assurance: Chromium forms a dense chromium oxide film, resisting high-temperature oxidation and sulfide corrosion; molybdenum optimizes resistance to pitting and crevice corrosion.
II. Core Performance of the Tee (Compared with Conventional Alloy Tees)
III. Typical Application Scenarios1.Aerospace ▶Scenarios: Turbine manifold pipes of aero-engines, fuel manifolds of rocket propulsors ▶Requirements: High temperature (800 - 900℃), high vibration, lightweight ▶Value: The specific strength (strength/density) of Inconel 718 tee exceeds that of titanium alloy, reducing weight by 15 - 20%; excellent thermal fatigue resistance, capable of withstanding more than 1000 thermal cycles (common alloy tees < 200 cycles). ▶Scenarios: Coolant manifolds of primary circuits of pressurized water reactors, helium transportation pipelines of high-temperature gas-cooled reactors ▶Requirements: Radiation resistance, resistance to high-temperature and high-pressure water corrosion (300 - 350℃, 15 - 16MPa) ▶Value: Inconel 718 contains niobium, which can inhibit irradiation swelling; in high-temperature and high-pressure water, the corrosion allowance > 2mm (design life 60 years), far exceeding that of carbon steel/stainless steel tees. 3.Marine Engineering ▶Scenarios: Riser manifold tees for deep-sea oil and gas exploitation, high-pressure reverse osmosis (RO) systems for seawater desalination ▶Requirements: Resistance to seawater erosion corrosion, resistance to stress corrosion cracking (SCC) in marine environments ▶Value: In a seawater environment with 3.5% salt content, the pitting potential of Inconel 718 tee > 1.2V (about 0.3V for 316L), avoiding local corrosion caused by chloride ions; SCC resistance improved by more than 5 times.
IV. Processing and Adaptability1.Hot Working Difficulties ▶Due to high alloying (high niobium and molybdenum contents), forging requires strict temperature control (950 - 1050℃); otherwise, hot cracking is likely to occur. A "small deformation, multiple passes" process is required to ensure uniform structure. 2.Welding Characteristics ▶Suitable for arc welding and plasma welding, with no post-welding cracking tendency (due to the delayed precipitation of γ′′ phase, avoiding welding stress concentration); it is recommended to use matching welding materials (such as ERNiFeCr - 2), and the strength of welded joints can reach more than 90% of the base metal. 3.System Adaptability ▶It can be seamlessly connected with Inconel 718 pipes, flanges, etc., to form an "all-alloy system", avoiding galvanic corrosion from dissimilar material connections; it can also be surface-treated (such as silver plating, nitriding) to adapt to higher cleanliness (such as high-purity gas transportation in the semiconductor industry) or more wear-resistant scenarios (such as powder transportation pipelines). SummaryInconel 718 tee is a "customized pipe fitting for extreme working conditions". With its all-round advantages of high-temperature high strength,
creep resistance, and corrosion resistance, it has become a
"necessary component" in high-end fields such as aerospace, nuclear
energy, and marine engineering. Its value is not only in physical
connection but also in being the core support for ensuring the
"safe, long-life, and high-performance" operation of systems in
high-temperature, high-pressure, and strong-corrosion environments.
DINGSCOHunan Dinghan New Material Technology Co., Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.We are dedicated to providing our customers with best quality products, fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars, rods, forged flanges, valve parts (Ball, Stem, Seat Ring, etc), forged shapes (shafts, discs, blocks, hubs, rings, cylinders and other custom shapes) according to ASTM, ASME, API, AMS, NACE and other industry standards.
PROFESSIONAL NICKEL ALLOY MANUFACTURER
CORE VALUE
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