ASTM A333 GR3 cryogenic steel pipe is a seamless steel pipe for cryogenic pipelines, primarily used in pressure vessel pipelines and heat exchanger pipelines in cryogenic environments ranging from -45℃ to -195℃.
The available specifications for this steel pipe range from outer diameter 8-1240mm and wall thickness 1-200mm. By controlling the chemical composition and mechanical properties, it meets the requirements for cryogenic impact resistance and is suitable for manufacturing cryogenic equipment in fields such as liquefied natural gas and chemicals.
A333Gr3 is a low-temperature toughness seamless steel pipe under the ASTM standard. Its main component is carbon manganese steel, and the addition of nickel (approximately 3.5%) significantly improves its low-temperature impact resistance. Its core standard requirements include:
1. Low-temperature impact test: At -101℃, the Charpy V-notch impact energy must be ≥20J (according to ASTM A370) to ensure the material is not prone to brittleness in extremely cold environments.
2. Chemical composition control: Carbon content ≤0.19%, and sulfur and phosphorus impurities are extremely low (both ≤0.025%), reducing the risk of cold brittleness.
3. Manufacturing process: Normalizing treatment is required to refine the grain and enhance uniformity.
Applications
Due to its excellent cryogenic performance, A333 Gr3 is widely used in three core sectors: energy, chemical, and power.
Firstly, in the energy sector, it is used in liquefied natural gas (LNG) pipelines and cryogenic oil and gas extraction equipment.
Secondly, in the chemical sector, it is suitable for storage and transportation pipelines for cryogenic media such as ethylene and liquid ammonia.
Thirdly, in the power sector, it is used in auxiliary piping systems of nuclear power plants to withstand the cryogenic shock of coolants.