Names and identification, applications of inconel alloy

INCONEL® 600 alloy:

Inconel 600 - UNS N06600/W.Nr. 2.4816 is a standard engineering material for applications requiring resistance to corrosion and heat. The alloy also features excellent mechanical properties and presents the desired combination of high strength and good workability. The high nickel content gives the alloy corrosion resistance as it is virtually immune to chloride-ion stress corrosion cracking.

Chromium is resistant to sulfur compounds and also provides resistance to oxidizing conditions at high temperatures or in corrosive solutions. The alloy does not precipitation harden; it hardens and is only strengthened by cold working.

The versatility of INCONEL 600 alloy has led to its use in a wide range of applications involving temperatures from cryogenic to above 2000°F (1095°C). The alloy is widely used in the chemical industry because of its strength and corrosion resistance. Applications include heaters, electrostatics, bubble towers, and condensers for fatty acid processing; tube, tube sheet, and flake tray evaporators for sodium sulfide production; and abietic acid treatment equipment in the pulp industry.

The alloy's strength and resistance to oxidation at high temperatures make it useful for many applications in the heat treating industry.

In the aerospace industry, INCONEL 600 alloy is used for a variety of engine and airframe components that must withstand high temperatures.

Examples include locking wires, exhaust pipes, and turbine seals.

INCONEL 600 alloy is used in the electronics industry for components such as cathode ray tube spiders, thyratron grids, tube supports and springs.

The alloy is the standard material for nuclear reactor construction. It has excellent corrosion resistance with high purity water and no evidence of chloride ion stress corrosion cracking in the reactor water system has been detected. For nuclear applications, the alloy is manufactured to exacting specifications and is specified

Inconel 718 alloy:

(UNS N07718) also known as alloy 718 is a nickel-iron-chromium-niobium (columbium)-molybdenum-titanium-aluminium alloy developed to combine excellent strength with good fabrication properties in the annealed condition. Although limited to applications below 1200°F (650°C), at lower temperatures it is significantly stronger than materials such as Waspaloy, R-41, or X-750. It is also much more weldable than these alloys and is less susceptible to the stress aging cracking problems common to gamma-strengthened materials. At temperatures above 1200°F (650°C), alloy 718 is being replaced by other alloys with better hardness, heat resistance, and corrosion resistance.

Inconel alloys are oxidation and corrosion resistant, and have good heat resistance. It is commonly used in high temperature environments above 1000°C.

Difference between incoloy 925 & inconel 718

Alloy 925 and Alloy 718 have quite different compositions. However, since Alloy 925 achieves similar tensile strength as Alloy 718, it is increasingly used as a lower cost alternative in many Oil & Gas related applications.

Alloy 925 is a nickel-based alloy, meaning the largest element present is nickel, which makes up 38-46% of the total. It also contains iron, chromium, and molybdenum, but in lower proportions. Meanwhile, Alloy 718 contains 50-55% nickel, with similar amounts of chromium and molybdenum. Since nickel is an expensive alloying additive, the increased nickel content in Inconel 718 increases its price compared to Incoloy 925 by up to 20%.

The mechanical properties of Incoloy 925 are quite similar to Inconel 718, as both achieve high strength through precipitation strengthening. The addition of small amounts of titanium, aluminum, and niobium combine to form fine precipitates throughout the metal when the metal undergoes secondary heat treatment. These precipitates help to “pin” the microstructure of the metal when subjected to external loads, enhancing the strength and toughness of the metal.

Difference between alloy inconel 725 & Inconel 625:

The difference between Alloy 725 and 625 is small in composition, but much more significant in tensile strength.

Inconel 725 is a nickel-based alloy, primarily alloyed with chromium. Its composition is very similar to Inconel 625, except for the addition of titanium, which, when subjected to additional heat treatment, results in significantly higher strength.

Inconel 625 consists of at least 58% nickel, 20-23% nickel, 8-10% molybdenum, 3.15-4.15% niobium and small amounts of other elements. Inconel 725 consists of 55-59% nickel, 19-22.5% chromium, 7-9.5% molybdenum and 2.75-4% niobium and is therefore very similar to Inconel 625 and has almost identical physical properties. However, 1.00-1.75% titanium is added. This contributes to the formation of very fine precipitates throughout the metal during additional heat treatment. These precipitates help to "pin" the microstructure of the metal when subjected to external loads, increasing the strength and toughness of the metal. The so-called precipitation hardening means that Inconel 725 has twice the strength of Inconel 625. This makes it suitable for a wide range of load-bearing applications in the Oil & Gas industry where resistance to H2S corrosion is also required. In addition to high strength fasteners, it will be used in other components such as hangers, landing knobs, mandrels and polished drill bases.

Apmetal supplies Alloy 725 as round bar in diameters ranging from 1”-4” (25.4-101.6mm).

What is Inconel 625 used for?

Inconel 625 is used in a multitude of applications, perhaps more than any other alloy we have available. With its superior corrosion resistance, wide operating temperature range and ease of fabrication.

Because Inconel 625 readily withstands pitting and crevice corrosion in seawater, it has found use in marine applications ranging from submarine propellers and propulsion systems, to exhaust pipes, bellows, seals, fasteners, and instrumentation.

Aerospace applications take full advantage of Inconel 625’s resistance to oxidation, creep, and fatigue, which, coupled with its availability in sheet form and ease of welding/brazing, opens up a wide range of applications. These include aircraft piping and exhaust systems, fuel lines, bellows, and turbine components. It is also widely used in rocket engines.

Inconel 625’s superior corrosion resistance and versatility over a wide temperature and pressure range are key reasons for its widespread acceptance in the chemical processing industry. Its ease of fabrication means Inconel 625 is used in a wide range of components for plant equipment. Its high strength allows for use, for example, in vessels or tubes with thinner walls than other materials, thus improving heat transfer and reducing weight. Some applications that require the combination of strength and corrosion resistance of Inconel 625 include bubble caps, tubing, reactor vessels, distillation columns, heat exchangers, piping, and valves.

In the nuclear sector, Inconel 625 may be used for reactor core components and control rods in nuclear water reactors. This material may be selected for its high strength, excellent uniform corrosion resistance, stress cracking resistance, and excellent pitting resistance in water at temperatures of 500°-600°F (260-316°C). Alloy 625 is also being considered in advanced reactor concepts due to its high allowable design strength at elevated temperatures, particularly between 1200°-1400°F (649-760°C).

Apmetal supplies alloy 625 in round bar form up to 10” (254mm) in diameter.

Apmetal Co., Ltd. supplies Inconel Alloy steel materials imported from Europe and Japan,

- Solid round bar Inconel Alloy 600, inconel 718

- Inconel 625 plate

- Inconel alloy X-750 wire

- Inconel Alloy 800 and Alloy 800HT pipes

- Pipe fittings

Difference between incoloy 925 & inconel 718

Alloy 925 and Alloy 718 have quite different compositions. However, since Alloy 925 achieves similar tensile strength as Alloy 718, it is increasingly used as a lower cost alternative in many Oil & Gas related applications.

Alloy 925 is a nickel-based alloy, meaning the largest element present is nickel, which makes up 38-46% of the total. It also contains iron, chromium, and molybdenum, but in lower proportions. Meanwhile, Alloy 718 contains 50-55% nickel, with similar amounts of chromium and molybdenum. Since nickel is an expensive alloying additive, the increased nickel content in Inconel 718 increases its price compared to Incoloy 925 by up to 20%.

The mechanical properties of Incoloy 925 are quite similar to Inconel 718, as both achieve high strength through precipitation strengthening. The addition of small amounts of titanium, aluminum, and niobium combine to form fine precipitates throughout the metal when the metal undergoes secondary heat treatment. These precipitates help to “pin” the microstructure of the metal when subjected to external loads, enhancing the strength and toughness of the metal.

Difference between alloy inconel 725 & Inconel 625:

The difference between Alloy 725 and 625 is small in composition, but much more significant in tensile strength.

Inconel 725 is a nickel-based alloy, primarily alloyed with chromium. Its composition is very similar to Inconel 625, except for the addition of titanium, which, when subjected to additional heat treatment, results in significantly higher strength.

Contact Apmetal Co., Ltd. for product advice and quotation support

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