Flat Flange for Welding in DIN 2543 (PN16), DIN 2544 (PN25), and DIN 2545 (PN40) – Ladhani Metal Corporation

Flanges are essential components used in various industrial applications to connect pipes, valves, pumps, and other equipment, creating a secure and leak-proof seal. Flat welding flanges that comply with DIN 2543 (PN16), DIN 2544 (PN25), and DIN 2545 (PN40) standards are widely used due to their strength and versatility. These flanges are made from several materials, including Titanium, Inconel, Monel, Duplex, Super duplex, Carbon Steel, and Stainless Steel, which are selected based on their specific applications and required properties. This article provides an overview of these materials, their chemical compositions, uses, applications, and flange structures. For those looking for high-quality flanges and metal products, Ladhani Metal Corporation is a trusted supplier offering a wide range of materials and grades to meet the demands of various industries.

1. Introduction to Flat Flanges for Welding

A flange is a mechanical component used to join two sections of a pipeline, valve, or other equipment. Flat welding flanges are designed to be welded directly onto the pipe or equipment. Unlike raised-face flanges, flat flanges feature a smooth, flat surface and are commonly used in applications that require a uniform seal under moderate to low pressures.

At Ladhani Metal Corporation, we specialize in providing high-quality flat welding flanges in a variety of materials, such as Carbon Steel, Stainless Steel, Titanium, Inconel, and more, to meet the specific needs of our clients across industries.

2. DIN Flange Standards Overview

DIN 2543 (PN16): Rated for pressures up to 16 bar (for low-pressure systems such as water pipelines and general industrial piping).

DIN 2544 (PN25): Rated for pressures up to 25 bar (used for moderate-pressure systems like steam lines and industrial fluid systems).

DIN 2545 (PN40): Rated for pressures up to 40 bar (used in high-pressure applications like oil and gas pipelines and chemical processes).

3. Materials Used for Flat Welding Flanges

Flat welding flanges are made from a variety of materials, each offering distinct characteristics suited for different industrial applications. Below is a list of materials commonly used in the manufacture of these flanges, along with their grades and chemical compositions.

Carbon Steel Flanges

Material: ASTM A105, EN 10213-2

Applications: Carbon steel flanges are ideal for low-pressure systems, such as water pipelines, HVAC systems, and general-purpose fluid systems.

Properties: Carbon steel provides good strength, machinability, and cost-effectiveness but is vulnerable to corrosion in harsh environments.

Chemical Composition (ASTM A105)

        Carbon (C): 0.35% max

        Manganese (Mn): 0.60-1.05%

        Phosphorus (P): 0.035% max

        Sulfur (S): 0.035% max

        Iron (Fe): Balance

Stainless Steel Flanges

Material: ASTM A182 (Grades 304, 316, 321), EN 10213-4

Applications: Stainless steel flanges are commonly used in corrosive environments, including chemical processing, food processing, marine systems, and medical equipment.

Properties: Stainless steel is resistant to oxidation, corrosion, and staining. It is known for its strength, particularly in environments exposed to high temperatures or aggressive chemicals.

 (Grade 304 Stainless Steel, UNS S30400)

        Carbon (C): 0.08% max

        Manganese (Mn): 2.00% max

        Phosphorus (P): 0.045% max

        Sulfur (S): 0.030% max

        Chromium (Cr): 18.00-20.00%

        Nickel (Ni): 8.00-10.50%

        Iron (Fe): Balance

 (Grade 316 Stainless Steel, UNS S31600)

        Carbon (C): 0.08% max

        Manganese (Mn): 2.00% max

        Phosphorus (P): 0.045% max

        Sulfur (S): 0.030% max

        Chromium (Cr): 16.00-18.00%

        Nickel (Ni): 10.00-14.00%

        Molybdenum (Mo): 2.00-3.00%

        Iron (Fe): Balance

 (Grade 321 Stainless Steel, UNS S32100)

        Carbon (C): 0.08% max

        Manganese (Mn): 2.00% max

        Phosphorus (P): 0.045% max

        Sulfur (S): 0.030% max

        Chromium (Cr): 17.00-19.00%

        Nickel (Ni): 9.00-12.00%

        Titanium (Ti): 5x(C+N) to 0.60%

        Iron (Fe): Balance

Titanium Flanges

Material: ASTM B381 (Grade 2, Grade 5), UNS R50400, UNS R56400

Applications: Titanium flanges are ideal for highly corrosive environments, such as marine, aerospace, and chemical industries.

Properties: Titanium is lightweight, highly resistant to corrosion, and can perform well at high temperatures.

Chemical Composition (Grade 2 Titanium, UNS R50400)

        Carbon (C): 0.08% max

        Iron (Fe): 0.30% max

        Oxygen (O): 0.25% max

        Nitrogen (N): 0.03% max

        Titanium (Ti): Balance

Chemical Composition (Grade 5 Titanium, UNS R56400)

        Carbon (C): 0.08% max

        Iron (Fe): 0.30% max

        Oxygen (O): 0.20% max

        Nitrogen (N): 0.05% max

        Titanium (Ti): Balance

        Aluminum (Al): 4.0-6.0%

        Vanadium (V): 3.5-4.5%

Inconel Flanges

Material: Inconel 600, Inconel 625, Inconel 718, UNS N06600, UNS N06625, UNS N07718

Applications: Inconel flanges are used in extreme-temperature applications such as aerospace, nuclear reactors, and power plants.

Properties: Inconel provides excellent strength and resistance to oxidation, particularly in high-temperature and corrosive environments.

Chemical Composition (Inconel 600, UNS N06600)

        Nickel (Ni): 72.00-76.00%

        Chromium (Cr): 14.00-17.00%

        Iron (Fe): Balance

        Manganese (Mn): 1.00% max

        Silicon (Si): 0.50% max

        Carbon (C): 0.15% max

Chemical Composition (Inconel 625, UNS N06625)

        Nickel (Ni): 58.00-70.00%

        Chromium (Cr): 20.00-23.00%

        Molybdenum (Mo): 8.00-10.00%

        Iron (Fe): Balance

        Niobium (Nb): 3.15-4.15%

        Titanium (Ti): 0.40-1.15%+

Chemical Composition (Inconel 718, UNS N07718)

        Nickel (Ni): 50.00-55.00%

        Chromium (Cr): 17.00-21.00%

        Iron (Fe): Balance

        Molybdenum (Mo): 2.80-3.30%

        Titanium (Ti): 0.90-1.30%

        Aluminum (Al): 0.20-0.80%

Monel Flanges

        Material: Monel 400, Monel K-500, UNS N04400, UNS N05500

        Applications: Monel flanges are used in marine environments, chemical plants, and other highly corrosive environments.

        Properties: Monel provides excellent resistance to corrosion, especially in seawater, acids, and alkalis.

Chemical Composition (Monel 400, UNS N04400)

        Nickel (Ni): 63.00-70.00%

        Copper (Cu): 28.00-34.00%

        Iron (Fe): 2.5% max

        Manganese (Mn): 2.0% max

        Carbon (C): 0.30% max

Duplex Stainless Steel Flanges

Material: UNS S31803 (2205), UNS S32205

Applications: Duplex stainless steel flanges are used in oil and gas, chemical, and marine industries, offering both high strength and corrosion resistance.

Properties: Duplex steels provide excellent resistance to stress corrosion cracking and pitting, while maintaining high strength.

Chemical Composition (Duplex 2205, UNS S31803)

        Chromium (Cr): 22.00-23.00%

        Nickel (Ni): 4.50-6.50%

        Molybdenum (Mo): 3.00-3.50%

        Iron (Fe): Balance

        Manganese (Mn): 1.50-2.50%

        Nitrogen (N): 0.08-0.20% 

Super duplex Stainless Steel Flanges

Material: UNS S32750, UNS S32760

Applications: Super duplex stainless steel flanges are used in highly corrosive environments, such as chemical processing, desalination, and offshore oil and gas industries.

Properties: Super duplex flanges are resistant to pitting, stress corrosion cracking, and maintain high strength under pressure.

Chemical Composition (Super duplex 2507, UNS S32750)

        Chromium (Cr): 24.00-26.00%

        Nickel (Ni): 6.00-8.00%

        Molybdenum (Mo): 3.00-4.00%

        Iron (Fe): Balance

        Manganese (Mn): 1.00-2.00%

        Nitrogen (N): 0.24-0.32%

4. Uses and Applications of Flat Welding Flanges

        Carbon Steel Flanges: Used in water pipelines, low-pressure gas systems, and HVAC systems.
        Stainless Steel Flanges: Ideal for food processing, chemical processing, pharmaceutical industries, and marine environments.
        Titanium Flanges: Best for aerospace, marine, and chemical processing industries.
        Inconel Flanges: Used in high-temperature environments like power plants, aerospace, and nuclear reactors.
        Monel Flanges: Suitable for marine environments and chemical plants.

        Duplex & Super duplex Flanges: Applied in offshore oil rigs, chemical processing, and seawater desalination.

5. Structure of a Flat Flange

A typical flat flange has the following components:

Flange Face: The smooth, flat surface that mates with the gasket.

Bolt Holes: Positioned around the flange perimeter, used for bolting the flange to another flange or equipment.

Flange Bore: The central hole matching the pipe or equipment’s internal diameter.

Flange Thickness: The overall thickness ensures strength and pressure endurance.

Raised Ring (if applicable): Some flanges may feature a small raised lip to help with gasket sealing.

6. Conclusion

Flat welding flanges made from materials like Carbon Steel, Stainless Steel, Titanium, Inconel, Monel, Duplex, and Super duplex are essential in various industries for creating reliable, high-strength connections under different pressures and environmental conditions. Ladhani Metal Corporation provides a wide selection of high-quality flanges, helping engineers and industries choose the best materials and designs for their applications. Understanding the material compositions and their applications ensures engineers can select the best flange material for their specific needs, optimizing performance and longevity in industrial systems.

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