Views: 0 Author: J-VALVES Publish Time: 2025-01-03 Origin: Site
ASTM A351 is a standard specification for austenitic steel castings used in valves, flanges, fittings, and other pressure-containing parts. It is particularly designed for applications requiring high corrosion resistance and high-temperature performance.
Key Grades and Corrosion Resistance
• CF8 (Equivalent to 304 Stainless Steel): Offers good corrosion resistance and is suitable for general applications.• CF8M (Equivalent to 316 Stainless Steel): Enhanced corrosion resistance due to molybdenum content, making it suitable for more corrosive environments.
• CF3 and CF3M: Low-carbon versions of CF8 and CF8M, respectively, with improved weldability and reduced susceptibility to intergranular corrosion.
• Heat Treatment: All castings must undergo heat treatment followed by quenching in water or rapid cooling.
• Chemical and Mechanical Requirements: The steel must conform to specified chemical compositions and mechanical properties.
• Applications: Widely used in chemical processing, food processing, and petrochemical operations.
GB/T 12230 is a Chinese national standard that specifies the materials for gate valves, focusing on corrosion resistance and mechanical properties suitable for various industrial applications.
Key Materials and Corrosion Resistance
• Stainless Steel (e.g., 304, 316): These grades offer good to excellent corrosion resistance, depending on the specific alloy.
• Carbon Steel: Suitable for less corrosive environments but may require additional protective coatings.
• Alloy Steel: Enhanced mechanical properties and corrosion resistance for specific applications.
• Chemical Composition: The materials must meet specified chemical requirements.
• Mechanical Properties: Tensile strength, yield strength, and elongation must conform to standard requirements.
• Surface Quality: Visual inspection to ensure the casting is free from defects such as cracks and hot tears.
| Feature | ASTM A351 Ball Valves | GB/T 12230 Gate Valves |
| Material Grades | CF8, CF8M, CF3, CF3M | 304, 316, Carbon Steel, Alloy Steel |
| Corrosion Resistance | Excellent, especially CF8M | Good to excellent, depending on grade |
| Heat Treatment | Required, quenching in water or rapid cooling | As specified by material grade |
| Applications | High-temperature, corrosive environments | Various industrial applications |
