Low-temperature seamless pipe is a seamless steel pipe used in low-temperature environment. It has good toughness and strength, will not become brittle due to low temperature, and is widely used in industrial fields that require low-temperature transportation and storage.
The production of low-temperature seamless pipe mainly includes the following steps:
Raw material selection: Select high-quality low-temperature steel, such as low-temperature carbon steel and low-temperature alloy steel.
Heating: Heat the steel billet to a suitable temperature to make it easy to form.
Piercing: The heated steel billet is perforated into a hollow tube billet by a piercing machine.
Rolling: Through multiple rolling, the wall thickness of the tube billet is gradually reduced to achieve the required size and shape.
Cooling: Use appropriate cooling process to ensure the low-temperature performance of the steel.
Heat treatment: Heat treatment (such as annealing, normalizing, quenching and tempering) is carried out to improve the mechanical properties and low-temperature properties of the pipe.
Inspection: The finished pipe is subjected to non-destructive testing, chemical composition analysis and mechanical property testing to ensure that it meets the standard requirements.
Commonly used production materials for low-temperature seamless pipes:
Low-temperature carbon steel: such as A333 Gr.1, A333 Gr.6, A333 Gr.8, etc.
Low-temperature alloy steel: such as 9Ni steel, low-temperature nickel steel (such as A334 Gr.1, A334 Gr.6), 15NiCuMoNb, etc.
Stainless steel: such as 304L, 316L and other stainless steel materials with low-temperature toughness.
Common low-temperature seamless pipe steel grades include:
ASTM A333 Gr.1, Gr.3, Gr.6, Gr.8, Gr.9, Gr.10, Gr.11
ASTM A334 Gr.1, Gr.6
ASTM A312 TP304/304L, TP316/316L
The production and use of low-temperature seamless pipes need to comply with specific industry standards and specifications, including but not limited to:
American standards: ASTM A333, ASTM A334, ASTM A312
Japanese standards: JIS G3460, JIS G3461, JIS G3462
German standards: DIN 17175
International standards: ISO 15590-1
Low-temperature seamless pipes are widely used in the following fields:
Petroleum and natural gas industry: used for pipelines and equipment in low-temperature environments.
Chemical industry: used for the transportation and storage of cryogenic liquids (such as liquefied natural gas, liquid nitrogen, liquid oxygen, etc.).
Refrigeration and refrigeration engineering: used for pipes and equipment in refrigeration systems.
Liquefied Natural Gas (LNG) Transportation: Cryogenic piping systems for LNG ships and storage tanks.
Aerospace: Structural components and equipment for cryogenic environments.
Cryogenic seamless pipes are widely used in various industrial fields that require cryogenic transportation and storage due to their excellent performance and reliability in cryogenic environments. Their production requires strict control of materials, processes and quality to ensure safety and stable performance under cryogenic conditions.
