Everything You Need to know about Inconel 625 Flanges

Inconel 625 Flanges, or UNS N06625 or 2.4856, is a non-magnetic nickel alloy flange with exceptional oxidation and corrosion resistance. It has high strength and toughness in both temperatures ranging from cryogenic to 2000°F (1093°C) due to its excellent metallurgical stability and hardenability. It can be used in various applications due to these characteristics, such as chemical process industry components, pressure vessels, subsea hydraulic equipment and offshore oil platforms. The outstanding feature of Inconel 625 Flanges is its remarkable flexibility when subject to extreme temperatures or corrosive environments because of the presence of Niobium that helps it retain strength at any temperature range up to 2000°F (1093°C).

What are Inconel 625 Flanges?

INCONEL 625 flanges are a type of flange made from INCONEL 625 alloy. This alloy is designed to withstand high temperatures and corrosive environments, making INCONEL 625 flanges ideal for use in demanding applications such as oil and gas, chemical processing, and aerospace. These flanges are available in various sizes and can be customized to meet specific needs. Inconel 625 Flanges are fittings used in piping systems, specifically in connecting pipe sections. They are made from heat-resistant Nickel-Chromium alloy and have excellent corrosion resistance and high strength, making them ideal for chemical processing applications such as oil and gas production. In addition to their robust construction, they feature the bonus of being relatively lightweight, which makes installation easier than traditional steel flanges. Furthermore, they possess several properties that render them suitable for difficult conditions, such as exposure to extreme temperatures and pressurized environments. Their durability is further enhanced by the fact that they can be designed into any size or shape depending on the specific requirements of each application.

Why are Inconel 625 Flanges Used?

INCONEL 625 flanges are used in applications where strength, durability, and corrosion resistance are crucial. The high-temperature strength of INCONEL 625 makes it ideal for use in high-temperature applications, such as gas turbine exhaust pipes and heat exchangers. INCONEL 625 is also highly corrosion-resistant, making it the perfect choice in highly corrosive environments such as seawater and acidic compounds. Additionally, INCONEL 625 flanges are used in the aerospace industry due to their high strength-to-weight ratio. Inconel 625 Flanges are commonly used in industrial and commercial applications due to their superior physical and chemical properties. The material has excellent oxidation resistance, high strength, good formability, and weldability. It also has exceptional fatigue strength and can withstand high temperatures (up to 1093°C / 2000°F). In addition, it exhibits great corrosion resistance in various acidic and chloride-containing environments. These features make Inconel 625 the preferred choice for many challenging industrial flange applications, such as marine environments or offshore petroleum processing facilities.

How to select the right Inconel 625 Flange for your needs?

Selecting the right Inconel 625 flange for your needs depends on several factors. First, you should consider the pressure rating requirements for your application. This will ensure that the flange you choose can handle whatever type of pressure is necessary to meet your project’s specifications. Additionally, think about whether you need welded or slip-on connection points. Lastly, if corrosion resistance is important to you, ensure that the alloy material of your Inconel 625 flange is up to par – something like an ASTM B564 UNS N06625 working pressures and conditions should be sufficient for most applications requiring corrosion resistance. Ensuring these three criteria align with your requirements will help get you to the right Inconel 625 Flange effectively and efficiently.

Types of Inconel 625 Flanges

Inconel 625 Flanges are among the most popular and widely used in the piping industry. They are made from a nickel-chromium-molybdenum alloy, also known as an Inconel alloy. This benefit flanges because it provides superior strength, durability, corrosion resistance and heat resistance properties, making them ideal for high-temperature or extreme-pressure applications. The types of Inconel 625 Flanges include welding neck flange, slip-on flange, socket weld flange, lap joint flange, threaded (screwed) flange and blind (forged) flange. Welding neck flanges are designed to be welded to other components using full penetration butt-welds; slip-ons have a lower hub designed for easy installation; socket welds provide extra reinforcement when necessary – these require no additional backing ring; lap joints allow easier disassembly than welding necks; threaded ones require fewer bolts due to their holistic design; finally blinds allow a pipe plug with no access requirements.


INCONEL 625 flanges are a versatile and reliable component of many piping systems. Understanding what they are, why they are used, and how to select the right one for your needs is an important step in ensuring your pipe network’s safe and efficient operation. By considering factors such as size, pressure rating, and material compatibility, you can be sure to select the right INCONEL 625 flange for your specific needs.