Inconel Alloy 625

Inconel 625 is a nickel-based high-temperature alloy with a variety of excellent characteristics, and has a wide range of applications in many fields.

Chemical composition

Mainly composed of nickel, chromium, molybdenum, niobium and other elements. Nickel is the main component, chromium, molybdenum, niobium and other elements added to strengthen a variety of roles, such as molybdenum, niobium for the main strengthening elements.

Performance characteristics

Magnetic properties

At room temperature

At 20 ℃, the magnetic permeability of Inconel 625 is close to 1.0. and the magnetic permeability of air is close to the performance of non-magnetic materials, will not be magnetized, and will not have a significant impact on the magnetic field.

Melting point

Mechanical properties

Low temperature conditions

Even at low temperatures of minus 200°C it still maintains its non-magnetic properties, which gives it an obvious advantage in applications requiring low magnetic interference, such as the aerospace and nuclear industries.

The melting point ranges from 1290°C to 1350°C, which is slightly lower than that of common stainless steels (e.g. 304 stainless steel with a melting point of 1400 - 1450°C), but still at a high level compared to most nickel-based alloys. The high melting point is mainly due to the strong internal bonding of nickel and chromium with other alloying elements such as molybdenum and niobium. The addition of molybdenum (content of about 8 - 10%) and niobium (content of about 3.15 - 4.15%) significantly improves the high temperature stability of the alloy. Molybdenum increases the creep strength of the alloy at high temperatures, and the combination of niobium and nickel is able to form stable intermetallic compounds, which further improves the thermal stability and oxidation resistance of Inconel 625.

In terms of the minimum mechanical properties at room temperature

There are tensile strength, yield strength, Brinell hardness and other indicators, although no specific values are given here.

Tensile and fatigue properties

From low temperature to 980 ℃ have good tensile properties and fatigue properties, in the low temperature to high temperature (such as 980 ℃) range shows stable mechanical properties, and even in the salt spray atmosphere can resist stress corrosion.

Corrosion resistance

To oxidizing and reducing environments

It has excellent corrosion resistance to various corrosive media in oxidizing and reducing environments.

Resistance to pitting and crevice corrosion

It has excellent resistance to pitting and crevice corrosion, and does not produce stress corrosion cracking caused by chlorides.

Resistance to inorganic acid corrosion

It has excellent resistance to inorganic acid corrosion, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and mixed acid of sulfuric acid and hydrochloric acid, etc. At the same time, it can show very good corrosion resistance in hydrochloric acid solution of various concentrations at a temperature of 40℃, and it shows excellent corrosion resistance in many mediums, and it has excellent resistance to pitting corrosion, crevice corrosion, intergranular corrosion and erosion in chloride medium, and it also has the performance of resistance to corrosion of alkali and organic acid, and it has effective resistance to corrosion caused by chloride. Organic acid corrosion performance, effective resistance to chloride ion reductive stress corrosion cracking, in the static or cyclic environment are resistant to carbonization and oxidation, and resistance to corrosion of gases containing chlorine.

The field of application

Aerospace field

In the aerospace industry plays a pivotal role. Because of its ability to maintain excellent performance in high temperature, high pressure and corrosive environments, often used in the manufacture of key components of aircraft engines, such as turbine blades, combustion chamber parts and jet engine motorized blades, etc., but also in the astronautics structural components to occupy a place, to ensure that cosmic exploration is carried out smoothly. In addition, it is used in the manufacture of aircraft and rocket engine parts, as well as gas turbine blades and shafts. Its high-temperature strength and fatigue resistance make it ideal for these applications.

Chemical industry field

Can remain stable in harsh chemical environments, is used in the manufacture of a variety of corrosive media processing equipment, such as acidic solution distillation tower and brine corrosive environment of the heat transfer equipment, etc., can also be used in the manufacture of reactors and piping systems, as well as distillation towers and heat exchanger components, its corrosion resistance and high-temperature strength so that it can withstand the corrosion of chemical substances and high temperature.

Oil and gas industry

In the process of oil and gas extraction and processing, the equipment needs to cope with high temperature, high pressure and corrosion of the extreme conditions, Inconel625 is the ideal material to cope with these challenges, often used in the manufacture of oil well pipelines, valves, oil and gas separators and submarine equipment.

Nuclear industry

In the reactor core and control rod components and other key parts, this alloy with its excellent performance to ensure the safety and stable operation of nuclear facilities.

Automobile manufacturing field

It is used in automobile manufacturing, especially for high-performance cars and racing cars. Its high strength and corrosion resistance enable it to withstand high-speed and high-temperature driving conditions.