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Everything You Need to Know About Alloy 20 Flanges – Applications, Advantages, and Types

At Sandvik, we specialize in high-performance materials engineered for challenging environments. One of our top-performing products is Alloy 20 Flanges—a solution built to resist corrosion and deliver long-term durability in demanding industrial conditions. Designed for industries dealing with acidic and corrosive environments, these flanges offer unmatched reliability and strength. But what exactly are Alloy 20 flanges, and why are they such a crucial component across various sectors?

Alloy 20 Flanges are specialized pipe connection components made from a nickel-iron-chromium alloy with additional elements like copper and molybdenum. Known for its superior resistance to sulfuric acid, Alloy 20—also referred to as Carpenter 20—is a go-to material in chemical processing. These flanges are designed to maintain structural integrity in extreme environments, especially where traditional stainless steels might fail.

What sets Alloy 20 apart is its outstanding corrosion resistance, particularly against chloride stress corrosion cracking, pitting, and crevice corrosion. These features make it ideal for aggressive chemical applications. As one of the leading Alloy 20 Flanges Manufacturers, Sandvik delivers flanges that not only meet but exceed international standards, ensuring safety, quality, and longevity in every application.

The key advantages of Alloy 20 flanges include exceptional mechanical strength, excellent weldability, and a high resistance to acidic environments. The alloy’s stability at high temperatures also means it can withstand thermal cycling and pressure fluctuations without degrading. Whether you’re working with pipelines, pressure vessels, or heat exchangers, these flanges are designed to hold up under stress. This makes them a top choice among Alloy 20 Flanges Suppliers looking to offer premium products to their clients.

Alloy 20 flanges are used across a wide range of industries. In the chemical and petrochemical sectors, they’re a staple for transporting and processing sulfuric acid and other harsh substances. In the pharmaceutical and food processing industries, the alloy's resistance to contamination makes it ideal for hygienic systems. Power generation, paper and pulp, and marine environments also rely on Alloy 20 flanges due to their anti-corrosive properties. With increasing demand for materials that combine strength and safety, more Alloy 20 Flanges Stockists are turning to Sandvik for a dependable supply of these critical components.

There are several types of Alloy 20 flanges available, each designed for specific functions:

Weld Neck Flanges: Known for their long tapered hub and excellent stress distribution, ideal for high-pressure applications.

Slip-On Flanges: Easy to install and cost-effective, used in low-pressure systems with minimal risk of leakage.

Blind Flanges: Used to close off pipe ends, offering easy access for inspection or maintenance.

Socket Weld Flanges: Best suited for small diameter, high-pressure piping. Provide a strong weld and a smooth bore.

Threaded Flanges: Used in applications where welding is not possible, suitable for small-diameter, low-pressure pipelines.

As trusted Alloy 20 Flanges Exporters, Sandvik ensures every flange is precision-engineered to handle the toughest conditions while maintaining a leak-free seal. Whether you’re upgrading an existing system or building new infrastructure, Alloy 20 flanges from Sandvik offer the perfect blend of durability, corrosion resistance, and reliability.

In conclusion, Alloy 20 flanges are an indispensable component for industries that demand strength and resistance to harsh chemicals. With a full range of types and configurations available, Sandvik stands out as a reliable partner committed to delivering quality and performance. Choose Alloy 20 flanges when failure is not an option.

Specification of Alloy 20 Flanges

Alloy 20 Flanges Specification : ASTM B363 / ASME SB363
Dimension Standard : ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Standard : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Size : 1/2" (15 NB) to 48" (1200NB)
Class / Pressure : 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
DIN Flanges : DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673.
JIS Flanges : JIS B2220 5K, JIS B2220 10K, JIS B2220 16K, JIS B2220 20K
BS Flanges : BS4504 PN 6, BS 4504 PN 10, BS4504 PN 16, BS4504 PN 25, BS4504 PN 40, BS 4504 PN 64, BS 4504 PN 100, BS 4504 PN 160, BS 4504 PN 250, BS 10, BS Table D, BS Table E, BS Table F, BS Table H.

Equivalent Grades of Alloy 20 Flanges

STANDARD UNS WNR. EN AFNOR
Alloy 20 N08020 2.4660 NiCr20CuMo Z2NCUD31-20AZ

Chemical Composition of Alloy 20 Flanges

Grade C Mn Si S Cu Ni Cr Fe Mo P
Alloy 20 0.07 max 2.00 max 1.00 max 0.035 max 3.00 – 4.00 32.00 – 38.00 19.00 – 21.00 29.85 min* 2.00 – 3.00 0.045 max

Mechanical Properties of Alloy 20 Flanges

Element Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
Alloy 20 8.1 g/cm3 1443 °C (2430 °F) Psi -80,000, MPa -551 Psi - 35,000, MPa - 241 30 %