Common low-temperature carbon steel pipe grades include ASTM A333 Gr.1, A333 Gr.3, A333 Gr.6, which represent different material specifications and performance parameters to meet various low-temperature usage requirements. For example, ASTM A333 Gr.6 maintains good toughness and strength at extremely low temperatures, making it suitable for pipeline transportation in deep cold environments.
Additionally, domestic standards for low-temperature carbon steel pipes include Q345B/C/D/E, 09MnD, 09MnNiD, 16MnDG, which also exhibit excellent performance in low-temperature environments and are widely used in petrochemical and refrigeration industries.
Key Features of ASTM A333 Grades
ASTM A333 Gr.6: A nickel-free low-temperature steel with fine-grained ferrite microstructure, typically delivered in normalized or normalized + tempered condition.
ASTM A333 Gr.3: Similar to Gr.6 but with slightly different chemical composition, also suitable for cryogenic applications.
ASTM A333 Gr.1: A general-purpose grade for low-temperature service with basic toughness requirements.
Domestic Standards (GB/T)
09MnNiD/16MnDG: Contain nickel (Ni) to enhance low-temperature toughness, ideal for LNG storage tanks and cryogenic pipelines.
Q345 Series (B/C/D/E): Offer varying levels of low-temperature impact performance, with Q345E being the most suitable for extreme cold conditions.
Applications
ASTM A333: Used in LNG plants, refrigeration systems, and cryogenic pipelines.
Domestic Grades (09MnNiD, 16MnDG): Applied in petrochemical equipment, low-pressure vessels, and cryogenic storage
