ASTM A333-1.6 (i.e., ASTM A333 Gr.6) cryogenic seamless steel pipe is a seamless steel pipe specifically designed for cryogenic environments. It possesses excellent low-temperature toughness and strength, and is suitable for applications such as cryogenic pressure vessel piping and heat exchanger piping in temperatures ranging from -45℃ to -195℃. The following is a detailed introduction to this steel pipe:
First, what are the chemical compositions of ASTM A333 Gr.6 seamless steel pipe?
Carbon: ≤0.30%, helps reduce the brittleness of the steel.
Manganese: 0.29%~1.06%, improves the strength and toughness of the steel.
Silicon: ≥0.10%, aids in the deoxidation process of the steel and enhances its strength.
Phosphorus: ≤0.025%, high content reduces the toughness and weldability of the steel.
Sulfur: ≤0.025%, similarly, high content reduces the toughness and weldability of the steel.
Other elements: The content of elements such as chromium, nickel, molybdenum, and copper is strictly limited to ensure the low-temperature performance of the steel pipe.
Second, what are the mechanical properties of ASTM A333 Gr.6 seamless steel pipe?
Tensile strength: ≥415MPa, ensuring the steel pipe maintains structural integrity under pressure.
Yield strength: ≥240MPa, representing the minimum stress at which the steel pipe begins to undergo plastic deformation under stress.
Elongation: ≥30%, reflecting the plastic deformation capacity of the steel pipe, which is particularly important for use in low-temperature environments.
Impact toughness: At a specified low temperature (e.g., -45℃), the impact energy must meet certain requirements to ensure that the steel pipe does not undergo brittle fracture under low-temperature impact.
Third, what are the manufacturing processes for ASTM A333 Gr.6 seamless steel pipe?
Steelmaking process: Advanced steelmaking technologies are used, such as electric arc furnace steelmaking or converter steelmaking, precisely controlling the chemical composition, removing impurity elements, and adjusting the content of alloying elements.
Steel pipe forming: Mainly includes hot extrusion and cold drawing processes. Hot extrusion makes the internal structure of steel more uniform and eliminates minor defects; cold drawing improves the dimensional accuracy and surface quality of steel pipes.
Heat treatment: Normalizing or normalizing and tempering are commonly used to refine the grain, improve the strength and toughness of the steel, and enhance its machinability.
Fourth, what are the application areas of ASTM A333 Gr.6 seamless steel pipes?
Petrochemical industry: Used in low-temperature chemical storage and transportation systems, such as pipelines in low-temperature separation and ammonia synthesis processes.
Refrigeration industry: Used for low-temperature piping sections of refrigeration equipment, such as refrigerant transport pipelines in large cold storage facilities.
Liquefied natural gas (LNG) sector: Used for LNG transport pipelines to ensure safe and reliable operation under extremely low temperature conditions.
Polar research facilities: Used in the manufacture of various equipment and pipelines in low-temperature environments such as polar regions.
Fifth, what are the ASTM A333Gr.6 seamless steel pipe standards and certifications?
Standard: ASTM A333/A333M, a standard published by the American Society for Testing and Materials (ASTM), specifically specifies the technical requirements for seamless and welded steel pipes used at low temperatures.
Certification: This steel pipe must pass a series of quality tests and certifications to ensure it meets the requirements specified in the standard and has excellent resistance to brittle fracture under low-temperature conditions.
Post time: Jan-15-2026