AISI 4130 Flange is a forged steel component made from AISI 4130, a low-alloy steel that contains chromium and molybdenum as strengthening agents. AISI 4130 is widely known for its combination of toughness, strength, and weldability, making it suitable for high-pressure and high-temperature applications. These flanges are commonly used in oil and gas industries, petrochemical plants, and various machinery, where resistance to corrosion and extreme stress is essential.

Key Features of AISI 4130 Flange:

1. High Strength and Toughness: AISI 4130 flanges provide excellent tensile and yield strength, making them ideal for use in high-stress environments.

2. Good Weldability: The low carbon content of AISI 4130 makes it easier to weld compared to other high-strength alloys without losing its mechanical properties.

3. Corrosion Resistance: The chromium content enhances the flange’s resistance to oxidation and corrosion, making it suitable for harsh environments, including oil, gas, and chemical applications.

4. Wear and Fatigue Resistance: AISI 4130 flanges are resistant to wear and fatigue, offering long service life even in challenging conditions.

5. Heat Treatment Compatibility: These flanges can be heat-treated to enhance their hardness and strength further, depending on the specific application requirements.

Common Types of AISI 4130 Flanges:

• Weld Neck Flange: Designed to withstand extreme pressure and temperature, often used in pipeline applications.
• Slip-On Flange: Easier to install than weld neck flanges, commonly used in low-pressure applications.
• Blind Flange: Used to close the end of a pipe, offering flexibility in systems that may need expansion or modification.
• Socket Weld Flange: Used in high-pressure systems and smaller pipe sizes, with a socket fit for easy welding.
• Threaded Flange: Ideal for connections that do not require welding, offering easy assembly and disassembly.
• Lap Joint Flange: Often used with stub-end fittings, allowing for easy installation and rotation.

Applications:

• Oil and Gas Industry: AISI 4130 flanges are widely used in oil and gas pipelines, particularly for high-pressure and high-temperature applications like drilling rigs, wellhead components, and production manifolds.
• Petrochemical and Refining: These flanges are essential in chemical processing plants and refineries, where resistance to corrosion and high temperatures is required.
• Aerospace: Due to its high strength-to-weight ratio, AISI 4130 is used in aerospace applications, including structural components and assemblies.
• Power Generation: AISI 4130 flanges are used in power plants, especially in high-pressure steam systems and turbines.
• Automotive and Racing: The toughness and lightweight properties make it ideal for high-performance automotive parts like suspension systems and chassis components.

Mechanical Properties:

• Tensile Strength: Approximately 560 MPa (81,200 Psi)
• Yield Strength: Around 460 MPa (66,700 Psi)
• Elongation: 21% in 50 mm
• Hardness: Brinell Hardness of approximately 197 HB
• Impact Strength: Excellent impact toughness, especially after heat treatment.

Advantages:

• High Performance: AISI 4130 flanges are designed to perform under extreme pressure and temperature conditions, offering durability and safety in critical applications.
• Versatility: Available in various types and configurations, AISI 4130 flanges can be customized to fit specific requirements and applications.
• Cost-Effective: The alloy’s balance between cost and performance makes it an economical choice for high-strength applications compared to other high-alloy materials.
• Compatibility with Heat Treatment: The ability to further enhance its properties through heat treatment makes it adaptable for different engineering applications.

Sizes and Standards:

AISI 4130 flanges are available in a wide range of sizes and conform to various international standards like ASTM, ASME, ANSI, DIN, and EN. They are typically available in sizes ranging from ½ inch to 36 inches or even larger, depending on the application requirements.

Heat Treatment Options:

• Annealing: For increased softness and machinability.
• Normalizing: To refine the grain structure and improve mechanical properties.
• Quenching and Tempering: To achieve the highest strength and toughness balance.

Surface Treatment:

AISI 4130 flanges can be coated or treated with various surface finishes, including:

• Galvanization: For enhanced corrosion resistance.
• Black Oxide: To improve wear resistance and appearance.
• Polishing: For improved aesthetics and reduced friction in certain applications.

AISI 4130 Flanges offer a perfect combination of strength, toughness, and corrosion resistance, making them suitable for various high-pressure and high-temperature industrial applications.