Material specifications for cryogenic tubing vary depending on the specific application needs. Generally speaking, the commonly used materials for cryogenic pipes include 16MnDG, 10MnDG, 09DG, 09Mn2VDG, 06Ni3MoDG, etc., as well as different grades of Grade1 to Grade11 under the ASTM A333 standard. These materials have excellent low-temperature properties and can maintain a stable working state in a low-temperature environment of -45°C~-195°C.
As for the specifications, the spot specifications of seamless steel pipes for cryogenic pipes are usually 8-1240×1-200mm, and there are other specifications such as seamless pipes with a diameter of 16-426mm and a wall thickness of 2-40mm, or welded pipes with a diameter of 219-3500mm and a wall thickness of 6-30mm. These specifications can be customized to meet specific engineering needs.
Please note that the selection of materials and specifications for cryogenic pipes needs to be comprehensively considered according to the actual working environment, pressure, temperature and other conditions to ensure the safety and stability of the pipeline. Therefore, when choosing cryogenic piping material specifications, it is recommended to consult a professional engineer or supplier for more accurate advice.
What factors to consider in the selection of cryogenic pipe material specifications
When selecting cryogenic piping material specifications, the following factors need to be considered:
Low-temperature properties
The low-temperature toughness, ductility, and crack resistance of the material are key. At low temperatures, these properties of materials can be compromised, so it is important to select materials that maintain sufficient strength and stability at specific low temperatures.
Corrosion resistance
At low temperatures, pipes may be exposed to more corrosive substances. Therefore, the corrosion resistance of the material is an important consideration. For specific corrosive environments, it may be necessary to select materials with specific corrosion resistance.
Thermal expansion
Thermal expansion or contraction of the pipe material due to temperature changes. When selecting a material, its coefficient of thermal expansion needs to be considered to ensure that the pipe does not develop excessive stress or deformation when the temperature changes.
Thermal insulation performance
The thermal insulation performance of low-temperature pipelines has an important impact on energy consumption and pipeline operation efficiency. Therefore, it is necessary to choose materials with excellent thermal insulation properties to reduce heat loss.
Tightness
The sealing performance of cryogenic pipes is critical to the safe operation of pipelines. Therefore, it is necessary to choose materials with good sealing properties to prevent leakage.
Ease of construction: Ease of construction, such as processing, welding, and installation of materials, is also a factor to consider. Choosing materials that are easy to apply can reduce the difficulty and cost of construction.
Economy
On the premise of meeting the above requirements, the economy of the material also needs to be considered. It is necessary to comprehensively compare the price, performance and service life of different materials and other factors to choose the most cost-effective material.
Design temperature and pressure
The design temperature and pressure of the pipe are important criteria for selecting material specifications. It is necessary to ensure that the selected material will work properly within the expected temperature and pressure range.
To sum up, the above factors need to be comprehensively considered when selecting the material specifications of cryogenic pipes to ensure the safety, stability and economy of the pipeline. In the actual project, it is recommended to consult a professional engineer or supplier to get more accurate advice.
