ASTM 2507, also known as UNS S32750, is a super duplex stainless steel designed to meet the rigorous demands of applications requiring exceptional strength and corrosion resistance. This steel grade combines the beneficial properties of both austenitic and ferritic stainless steels, resulting in a material with superior performance across various industrial sectors. In this article, we will delve into the ASTM standard for 2507 and explore its unique features, applications, and composition.

1. ASTM Standard for 2507

The ASTM standard for 2507 is governed by ASTM/ASME A240, which outlines the specifications for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. The UNS (Unified Numbering System) designation for this steel is S32750, providing a standardized way to identify it globally.

2. Chemical Composition

ASTM 2507 stainless steel boasts a unique chemical composition that contributes to its exceptional performance. Key elements in its makeup include:

● Chromium (Cr): Approximately 25%, providing excellent resistance to oxidation and corrosion.

● Nickel (Ni): Approximately 7%, enhancing corrosion resistance and improving the steel's toughness.

● Molybdenum (Mo): Around 4%, significantly boosting resistance to pitting and crevice corrosion, especially in chloride-containing environments.

● Carbon (C): Up to 0.03%, ensuring good weldability and minimizing the risk of intergranular corrosion.

● Nitrogen (N): Between 0.24% and 0.32%, enhancing the steel's strength and corrosion resistance.

● Other elements such as manganese (Mn), silicon (Si), phosphorus (P), and sulfur (S) are present in controlled amounts to maintain the desired properties.

3. Mechanical Properties

ASTM 2507 stainless steel exhibits outstanding mechanical properties, making it suitable for high-stress applications. Key mechanical properties include:

● Tensile Strength: ≥90 ksi (620 MPa) to ≥110 ksi (800 MPa).

● Yield Strength (0.2% Offset): ≥65 ksi (450 MPa) to ≥80 ksi (550 MPa).

● Elongation: ≥25%, indicating good ductility.

● Impact Energy: ≥74 ft-lbs (100 J), demonstrating high toughness.

4. Corrosion Resistance

ASTM 2507 stainless steel is renowned for its exceptional corrosion resistance, particularly in chloride-containing environments. Its high chromium, molybdenum, and nitrogen content provide outstanding resistance to:

● Pitting and Crevice Corrosion: In various chloride solutions, 2507 demonstrates better resistance than other duplex stainless steels.

● Uniform Corrosion: It withstands uniform corrosion in organic acids like formic and acetic acids, as well as in inorganic acids containing chlorides.

● Intergranular Corrosion: The low carbon content minimizes the risk of carbide precipitation during heat treatment, resulting in high resistance to intergranular corrosion.

● Stress Corrosion Cracking (SCC): The duplex microstructure enhances its ability to resist stress corrosion cracking.

5. Applications

Due to its exceptional properties, ASTM 2507 stainless steel finds widespread applications across various industries, including:

● Petroleum and Natural Gas: Used in offshore platforms, heat exchangers, underwater equipment, and piping systems.

● Chemical Processing: Suitable for vessels, pipes, and desalination plants handling aggressive chemicals.

● Energy Industry: Utilized in FGD (Flue Gas Desulfurization) systems, industrial scrubbers, and absorption towers.

● Mechanical and Structural Components: High-strength, corrosion-resistant parts for various machinery and structures.

● Seawater Systems: Ideal for seawater desalination plants, high-pressure reverse osmosis units, and seawater piping.

6. Conclusion

ASTM 2507 stainless steel, also known as UNS S32750, is a super duplex stainless steel designed to meet the most demanding requirements for strength and corrosion resistance. Its unique chemical composition and duplex microstructure provide outstanding mechanical properties and resistance to various forms of corrosion, including pitting, crevice, uniform, intergranular, and stress corrosion cracking. With its broad range of applications across the petrochemical, chemical processing, energy, and mechanical industries, ASTM 2507 stainless steel stands as a testament to its versatility and performance.

7. Why Zhengkuan Steel?

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