Inconel Flanges

Inconel flanges are premium-grade components widely used in high-temperature and highly corrosive environments such as chemical processing, power generation, and marine industries. These flanges are made from specialized nickel-based alloys designed to deliver superior strength, resistance to oxidation, and long-term durability under extreme operating conditions. Various grades of these alloys offer unique chemical and mechanical characteristics tailored for specific industrial applications.

Chemical Composition:

One of the common grades used in these flanges contains a minimum of 50.015% nickel, 20.00–22.50% chromium, 12.50–14.50% molybdenum, and up to 6.00% iron. The carbon content is kept very low (0.010% max), ensuring excellent weldability and minimal carbide precipitation. Other elements such as manganese (0.50% max), silicon (0.08% max), and cobalt (up to 2.50%) are controlled to enhance performance in corrosive environments.

Another alloy variant includes 50.99% minimum nickel, 14.50–16.50% chromium, and a higher molybdenum range of 15.00–17.00%, with 4.00–7.00% iron. This composition is ideal for applications exposed to reducing media. Sulfur and phosphorus levels are kept very low to maintain purity and prevent brittleness.

A third grade focuses on a high nickel base (65.0% min) with 28.5% molybdenum and smaller amounts of chromium (1.5%), iron (1.5%), and tungsten (up to 3.0%). Manganese, aluminum, titanium, and silicon are also present in controlled amounts to provide added stability and corrosion resistance.

A fourth alloy type features a balance of nickel with 20.50–23.00% chromium, 17.00–20.00% iron, and 8.00–10.00% molybdenum. It also includes cobalt (0.50–2.50%) and small quantities of manganese, carbon, silicon, phosphorus, and sulfur, optimized for high-temperature resistance.

Mechanical Properties:

These nickel-based alloys exhibit impressive mechanical strength. One variant has a tensile strength of 690 MPa and a yield strength of 310 MPa, with an elongation of 45%, and a density of 8.69 g/cm³. Another displays even greater tensile strength at 790 MPa and a yield strength of 355 MPa, along with 40% elongation and a density of 8.89 g/cm³.

Other alloys show tensile strengths between 655–760 MPa, with yield strengths ranging from 240–350 MPa and elongation around 35–40%, making them well-suited for forming and fabrication under pressure. Their melting points range from 1355°C to 1399°C, highlighting their ability to withstand extreme thermal conditions.

These performance-driven properties make Inconel flanges a trusted choice for reliability and durability in the most demanding settings.