Low temperature pipe
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High-performance cryogenic pipes are designed for the transportation of ultra-low temperature media such as liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, and liquid hydrogen. The products' core advantages are their excellent low-temperature resistance, high sealing performance, and impact toughness. They are widely used in the energy, chemical, aerospace, military, and medical research fields, providing safe and reliable pipeline solutions for extremely cold conditions.
Product name：
Martensitic precipitation hardening stainless steel
Material：
15-5PH
Warehouse：
Tianjin
Surface treatment：
Polishing/Grinding/brushing/pickling/passivation/electroplating
Category：
Keyword：
Low temperature pipe
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Details description
Execution Standard
Domestic Standard: GB/T 18984-2003, which stipulates the technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of seamless steel pipes for low-temperature pipelines.
International Standards: such as ASTM A333/SA333M "Seamless and Welded Nominal Steel Pipes for Low Temperature Service" and ASTM A334/SA334M "Seamless and Welded Carbon and Alloy Steel Pipes for Low Temperature Service", which make detailed provisions on the material, dimensions, and performance of low-temperature pipes.
Product Material
Low-alloy high-strength structural steel: such as 16MnDG, 10MnDG, 09DG, etc. Among them, 16MnDG is a commonly used material, which has the advantages of high strength and good comprehensive performance. By adding a small amount of alloying elements, the toughness and strength of the steel at low temperatures are improved.
Specifications and Dimensions
Small-diameter steel pipes: The outer diameter is usually between Φ10-219mm, the wall thickness is 1-15mm, and the length is generally 3-12.5m.
Large-diameter steel pipes: The outer diameter ranges from Φ323.8-720mm, the wall thickness is 6.35-40mm, and the length is 6-14m.
Mechanical Properties
The mechanical properties of low-temperature pipes of different materials vary, but overall, they are required to have good strength, toughness, and fatigue resistance at low temperatures. Taking common materials as an example, the tensile strength of 16MnDG is 490-665MPa, the yield strength ≥325MPa, and the elongation ≥30%; the tensile strength of A333 Grade 6 ≥415MPa, the yield strength ≥240MPa, and the elongation ≥30% (longitudinal), ≥16.5% (transverse).
Production Process
Smelting: Using electric furnaces or converters for steelmaking, strictly selecting and proportioning raw materials, precisely controlling chemical composition, removing impurities and harmful components such as gases through refining processes, and improving the purity of molten steel.
Rolling: Generally using hot continuous rolling technology, the heated steel billet is rolled multiple times to achieve the specified dimensions and performance requirements. By controlling parameters such as rolling temperature, speed, and reduction, the steel structure is adjusted to improve the strength and toughness of the steel pipe.
Heat Treatment: According to material and performance requirements, the steel pipes undergo normalizing, tempering, and quenching heat treatments to refine grains, eliminate residual stress, and improve the low-temperature toughness, strength, and plasticity of the steel.
Surface Treatment: In order to improve the corrosion resistance and service life of the steel pipes, surface treatment processes such as pickling, passivation, and painting are usually performed on the steel pipes.
Product Applications
Low-temperature pressure vessels: such as liquefied natural gas (LNG) storage tanks, liquid oxygen storage tanks, liquid nitrogen storage tanks, etc., used to store low-temperature liquids, requiring low-temperature pipes to connect various components to ensure the safe transportation and storage of the medium.
Low-temperature pipeline systems: Widely used in low-temperature process pipelines in the petrochemical, natural gas, and air separation industries, used to transport low-temperature media such as ethylene, propylene, liquid nitrogen, and liquid argon.
Low-temperature heat exchangers: As the pipeline material for low-temperature heat exchangers, it can achieve heat transfer and exchange in a low-temperature environment, ensuring the normal operation of the heat exchanger.
Quan Ge Pipe Industry——Tempered by the "cold," safeguarding against extreme cold challenges!
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