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Inconel 625 AMS 5599, Inconel 625 UNS N06625) is a nickel-based superalloy with excellent corrosion and oxidation resistance. Through solid solution strengthening, molybdenum and niobium are alloyed with the nickel-chromium matrix of this material to reinforce it. With this process, Inconel 625 can maintain high strength and toughness at temperatures ranging from cryogenics to 1800°F (982°C). With its high tensile strength, fabricability, and traceability, it is nonmagnetic and austenitic. In thin-walled seawater applications, such as heat exchangers, fasteners, and cable sheathing, this alloy is virtually immune to chloride ion stress corrosion cracking and pitting due to its high nickel content. Inconel Sheets, coils, Inconel 625 plates, and round bars of 625 alloy are available from us.

The majority of standard methods can be used in cold form, hot work, and machine alloy 625. In addition, cold working and machining should be done with caution, as it hardens more quickly than austenitic stainless steels. When forming, the temperature should range between 1700 and 2150°F (927-1177°C). To maintain sharpness, it is recommended to use rigid, powerful machines with sharp tools at positive rake angles. All 625 can be welded through typical gas-shielded processes with heavy constant feeds.

There are three primary heat treatments for this alloy: solution annealing at 2000-2200°F (1093 - 1204°C) with air or rapid quenching, annealing at 1600-1900°F (927-1038°C) with air or rapid quenching, and stress relieving at 1100-1600°F (593 - 900°C) with air quenching. A high-temperature annealing process is used for applications above 1500°F for creep resistance. Medium temperature annealing provides optimal tensile and ruptures properties up to 1900°F (1038°C), while stress relieved state is recommended for applications under 1200°F (649°C), where maximum fatigue, hardness, and yield strength are required. We can also discuss the Inconel 625 specifications and Inconel 625 price, etc.

Inconel 625 sheets

Designed to survive in a cryogenic environment, Inconel 625 Sheets & Inconel 625 Plates offer resistance to fatigue corrosion, stress corrosion cracking, chloride ions, pitting, etc. It is a versatile product that offers resistance to corrosion, stress corrosion cracking, chloride ions, pitting, etc. With its combination of molybdenum and chromium-nickel raw materials, Inconel 625 Sheets & Inconel 625 Plates are suitable for exhaust systems, duct systems, marine environments, and many more. The material is thermally stable, formable, weldable, corrosion-resistant, and non-magnetic.

High strength, heat resistance, and corrosion resistance make Inconel 625 one of the most popular nickel-chromium-molybdenum alloys. Nickel constitutes the majority of this superalloy (58% min. ), followed by chromium, molybdenum, niobium, iron, tantalum, cobalt, manganese, silicon, aluminum, and titanium. Haynes 625, Altemp 625, Nickelvac 625, and Nicrofer 6020 are also common names for Inconel 625.

The strength of Inconel 625 can be determined by measuring its tensile strength, corrosion resistance, and even melt resistance. Inconel 625 has a tensile strength range of 103 - 160 ksi compared to the 73.2 ksi of stainless steel. 

Though exact measurements vary, reported statistics state the range of the Inconel melting point between 2,350°F and 2,460°F (1,290°C and 1,350°C). While the Inconel melting point is lower than that of stainless steel, Inconel 625 is stronger than stainless steel at high temperatures while being more resistant to oxidation and scaling as well.

Inconel is considered a superalloy due to being well suited for extreme pressure and heat environments as well as being corrosion resistant. However, stainless steel alloys are often more suitable for sterile manufacturing or medical applications. A superalloy like Inconel tends to be better for heat-treating applications and other high-temperature processes. 

Inconel 625 Sheets & Plates Special Features:

  • Each bundle is covered with plastic for protection against extreme weather
  • End of 625 Inconel Plate protected by plastic Strip
  • End of 625 Inconel Plate protected by plastic Strip
  • Each radius of the U-Bend tube separated by a separator
  • Packaging list (laminated) placed with box/crate

In the high-nickel superalloy Inconel family, Inconel 625 is between Inconel 330 and 600 when it comes to nickel content. This combination, along with columbium and molybdenum, allows for this type of Inconel melting point to be very high and perform well in high heat. Inconel 625 is especially resistant to chloride pitting, and fatigue stress, and has a particularly high creep rupture strength and high oxalic resistance. Additionally, Inconel 625 is very easy to weld when compared to other Inconel variations.

Due to its high chemical and temperature-resistant qualities, the superalloy Inconel 625 can be used in a variety of applications, including jet engine exhausts, flare stacks, seawater equipment, and chemical plant equipment.

Inconel 625

Inconel is ideally used in the oil and gas extraction industries due to its high-temperature resistance and oxidation-resistant properties. The oil and gas industries need a superalloy metal, like Inconel, that can withstand extreme environments and volatile, corrosive gases.

The superalloy Inconel 625 is especially useful for the processing systems required for natural gas production. Due to Inconel 625’s particularly strong thermal fatigue strength and oxidation resistance, it’s often used for the separation of extracted fluids or in-line steel transfer piping. 

Inconel is famously resistant to extreme temperatures and retains enough tensile strength at high temperatures to continue holding moderate loads (Inconel 625 retains 13.3 ksi tensile strength at 2,000°F). This makes Inconel the ideal basket material for heat treatment applications—comparing favorably to stainless steel alloys such as Grade 304, 316, and 330 SS.

Compared to most stainless steel alloys, a basket made from a superalloy like Inconel won’t lose shape as easily when holding parts through a rigorous heat treatment application.

Some manufacturing processes may combine high and low-temperature processes in rapid succession. Most Inconel alloys retain excellent oxidation resistance at high and low temperatures, allowing a single basket made from Inconel to be used in processes where temperatures vary between near-cryogenic lows and heat treatment highs.

Inconel is often used in marine applications because of its extraordinary resistance to sodium chloride (salt) at a variety of temperatures. So, for processes that use salt or factory locations near the ocean, Inconel can be ideal for a parts washing basket.

However, some stainless steel alloys also exhibit excellent resistance to saltwater. So, when would Inconel be considered preferable?

Generally speaking, this superalloy would only be much more useful than grade 316 stainless steel if extreme temperatures in excess of 1,000°F would be a concern as well. Inconel would retain its oxidation resistance better at high temperatures than 316 SS would.

Common Applications of 625

  • Aerospace components
  • Fasteners
  • Chemical Processing
  • Propeller blades
  • Submarine propulsion motors
  • Utility boat exhaust ducts
  • Steam-line bellows
  • Heat Exchangers
  • Flue gas desulfurization scrubbers
  • Chemical processing equipment for oxidizing and reducing acids
  • Marine components exposed to seawater, such as fasteners and cable connectors