ASTM A105 vs. A350 LF2 vs. A516 Gr.70: How to choose the right flange material?

Selecting the right flange material is crucial for ensuring safety, durability, and performance in industrial piping systems. The choice depends on factors such as operating temperature, pressure rating, and environmental conditions. Among the most commonly used materials are ASTM A105, ASTM A350 LF2, and ASTM A516 Gr.70, each designed for specific applications.

This article will help you understand the differences between these materials and determine which one is best suited for your project.

ASTM A105: Carbon Steel for High-Temperature and High-Pressure Applications

What is ASTM A105?

ASTM A105 is a forged carbon steel used for manufacturing flanges, fittings, and piping components for high-temperature and high-pressure systems. It is widely used in oil & gas pipelines, power plants, and petrochemical refineries.

Key Properties of ASTM A105:

Temperature Range: -29°C to 425°C (-20°F to 800°F)

Mechanical Strength: High tensile and yield strength, ensuring durability in pressurized environments

Application: Suitable for high-pressure pipelines, valves, and industrial piping systems

Cost-Effectiveness: More affordable than stainless steel and alloy materials

When to Use ASTM A105?

If your pipeline or flange system operates at room temperature to high temperatures and does not require low-temperature resistance, ASTM A105 is an ideal choice.

ASTM A350 LF2: The Best Choice for Low-Temperature Applications

What is ASTM A350 LF2?

ASTM A350 LF2 is a low-temperature carbon steel designed to withstand cold environments where standard carbon steel may become brittle. This material is commonly used in cryogenic piping, refrigeration systems, and offshore oil & gas applications.

Key Properties of ASTM A350 LF2:

Temperature Range: -46°C to 345°C (-50°F to 650°F)

Toughness: Excellent impact resistance, making it suitable for cold environments

Application: Used in cryogenic and low-temperature pipeline systems

Standards Compliance: Meets ASTM and ASME standards for low-temperature applications

When to Use ASTM A350 LF2?

If your pipeline operates in cold climates or handles cryogenic substances, A350 LF2 is the best material to prevent brittle fractures and ensure safety.

ASTM A516 Gr.70: Designed for Pressure Vessels, Not Flanges

What is ASTM A516 Gr.70?

ASTM A516 Gr.70 is a carbon steel plate primarily used for manufacturing pressure vessels and boilers rather than flanges. It offers high strength and excellent impact resistance, making it ideal for high-pressure storage tanks.

Key Properties of ASTM A516 Gr.70:

Application: Specifically used for pressure vessels and boiler construction

High Impact Strength: Ensures durability under extreme pressure conditions

Not Suitable for Flanges: Unlike ASTM A105 and A350 LF2, A516 Gr.70 is a plate material and is not designed for flange manufacturing.

When to Use ASTM A516 Gr.70?

If you are manufacturing a pressure vessel or boiler, A516 Gr.70 is the best choice. However, it should not be used for flanges, as it lacks the necessary forging properties.

Final Decision: Which Material Should You Choose?

Use ASTM A105 for high-pressure and high-temperature piping systems that do not require low-temperature toughness.

Use ASTM A350 LF2 for low-temperature pipelines or systems exposed to cold environments.

Use ASTM A516 Gr.70 for pressure vessels and boiler applications, but not for flanges.

At Haihao Group, we specialize in manufacturing high-quality ASTM A105 and A350 LF2 flanges, ensuring compliance with ASME B16.5, ASME B16.47, and other international standards. Our products undergo strict quality control, including chemical composition testing, mechanical property verification, and non-destructive testing (NDT), to guarantee durability and performance in your piping systems.

Looking for high-quality carbon steel flanges? Contact Haihao Group today! Email:sales@haihaogroup.com