Inconel 625 vs. Inconel 718 Tubing - Which is Best for Your Application
Inconel 625 pipe and Inconel 718 seamless round pipe are both high-temperature alloys with excellent comprehensive properties. The main difference between them is that the performance of Inconel 625 pipe is more inclined to corrosion resistance, while the performance of Inconel 718 round pipe is more inclined to high strength.
What is Alloy 625 Tube Made Of?
Alloy 625 Nickel Tube is made of a nickel-chromium-molybdenum alloy with the addition of niobium. High strength and toughness at cryogenic temperatures down to 1800°F (about 854°C). Good oxidation resistance, excellent fatigue strength, and good resistance to many corrosives.
Which grade does Inconel 625 pipe belong to?
Typically, cold worked Inconel 625 seamless pipes are supplied in two conditions, Gr. 1 and Gr. 2. ASTM B444 UNS N06625 Gr 1 pipes are supplied in the annealed condition, while Gr. 2 pipes are supplied in the solution annealed condition.
What is the ASTM standard for Inconel 625 pipe?
Nickel alloy 625 is a nickel-chromium-molybdenum-niobium alloy material with a primary nickel content of at least 58%. It is also known as Inconel 625 or UNS NO6625 according to ASTM B444 (pipe) or ASTM B443 (sheet and coil).
Difference in the Formability of Inconel 625 Tubing and Inconel 718 Tubing:
Due to the high nickel content, both Inconel alloy tubes have extremely high formability. Both Inconel 625 tube and 718 tube can be cold formed and stamped. Both materials have excellent tensile strength, but Inconel 718 tube has particularly good formability and maintains high strength in the annealed state because it resists post-weld cracking (or strain-age cracking) during heat treatment.
Due to the formability of Inconel alloy seamless tubes, these materials can be rolled through wire mills to provide different wire profiles for industries such as aerospace, oil and gas. In addition, they can be used to manufacture bellows, springs, seals, and honeycomb structures. In addition, they can be used as high-performance fastener alloys for harsh environments, such as where corrosion may be present.
Common Applications of Inconel 625 Tubing and 718 Tubing:
Inconel 718 round tubes and 625 seamless tubes are used in a variety of production applications. In addition to round, flat and square wire, product forms include strip, ribbon and bent wire. Interestingly, neither alloy is commonly used for deep drawing.
Both high-temperature alloys are used to manufacture many stamped parts, such as diaphragms for sensor measuring devices. They are particularly suitable where high temperature and high pressure resistance is required. Due to its excellent strength under high temperature and corrosive conditions and its oxidation resistance, Inconel 625 tube is often used to manufacture flexible metal hoses, heat exchangers, headers and ship components.
Industries that Use Inconel 625 Tubing and 718 Tubing:
Initially used in the aerospace industry, Inconel 718 Tube has since found widespread use across the industry. One study showed that the alloy accounts for more than 30% of the mass of finished components in modern aircraft engines. One notable application area for this superalloy, which is able to withstand extreme pressures, corrosive environments, and the thrust of jet fuel, is in aerospace engines.
Component alloys in automotive engines face similarly high stress environments. The nickel content gives Inconel 718 Tube superalloy excellent formability, benefiting a wide range of engine components. Inconel alloys are able to maintain the strong corrosion resistance required to ensure long-term durability while also meeting the unique shape requirements of automotive engine applications.
Inconel 625 Tube also has a wide range of uses in the marine industry due to its corrosion resistance, especially in environments containing sea salt. This covers requirements in the oil and gas industry, such as underwater pipeline tiebacks for downhole drilling. Other products such as telecommunications cables, propeller blades, and wire ropes can be made from Inconel 625 Tube and used in saltwater environments.
Gnee Steel is a supplier of Inconel 625 Pipe And Inconel 718 Tubing, covering pipes: seamless pipes: size: 4 - 219 mm; thickness: 0.5 - 20 mm; welded pipes: size: 5.0 - 1219.2 mm; thickness: 0.5 - 20 mm, plates: plate thickness 0.1 to 100 mm; plate width 10-2500 mm, strips, alloy round bar size: diameter 3-800 mm;, flat bar size: thickness 2-100 mm; width: 10-500 mm, hexagonal bar size: 2-100 mm;, wire and extruded profiles. We work with steel mills to provide customers with 625 alloy, and its products meet or exceed many leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN and BS standards.
Gnee Steel stocks and sells Inconel 625 Pipe And Inconel 718 Tubing, pipes, tubes, plates, strips, sheets, round bars, flat bars, forging billets, hexagons, wires and extruded profiles. You are welcome to contact us for a quote at any time at ss@gneesteel.com
