Production method of low temperature seamless steel pipe for liquefied natural gas
A technology of liquefied natural gas and seamless steel pipes, applied in temperature control, workpiece surface treatment equipment, metal rolling, etc., can solve the problems of welding bead tracking and feedback system research that have not yet started, and achieve low cost, high yield, and production The effect of simple process
Active Publication Date: 2016-05-04
PANGANG GROUP CHENGDU STEEL & VANADIUM
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Problems solved by technology
At present, relevant domestic manufacturing enterprises have carried out a lot of research and production process improvement on the application of 9Ni steel materials in the construction of large LNG storage tanks, and accumulated rich experience, but the research on welding bead tracking and feedback systems has not yet started. Especially in the production research of seamless steel pipe
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[0029] This embodiment mainly prepares the outer diameter of Φ273mm, the allowable tolerance of the outer diameter (-0.8, +2.4) mm; the wall thickness is 15mm, the allowable tolerance of the wall thickness is ± 12.5%, the length is greater than or equal to 6 mm, the ovality is less than or equal to 1.5%, and the wall thickness is not Cr.8 steel low-temperature seamless steel pipe for liquefied natural gas (LNG) with uniformity ≤2.8mm.
[0030] The process flow is as follows:
[0031] Φ280mmVD continuous casting billet → billet cutting → billet heating → piercing → 340mmMPM continuous rolling tube mill rolling tube billet → hot saw head and tail → cooling → straightening → finishing → size and surface quality inspection → packaging and storage;
[0032] Wherein, the billet heating is divided into a preheating section, a heating section and a soaking section. The preheating section is preheated at a temperature of 580~795℃ for ≥100min; the heating section is divided into heating secti...
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The invention discloses a production method of a low temperature seamless steel pipe for liquefied natural gas. The production method of the low temperature seamless steel pipe for liquefied natural gas comprises the following technological processes of: VD continuous billet casting, billet cutting, billet heating, perforation, rolling of tube blank by a continuous rolling-pipe unit, hot sawing of head and tail, cooling, straightening, finishing, size and surface quality inspection, packaging and warehousing. By studying the tube-making process of a Gr.8 low temperature pipe, the invention studies the pipe rolling process directed at service conditions and the large, medium and small size differences, ensures that the size accuracy of the produced seamless steel pipe meets the requirements of ASTM / ASME technical specifications, develops the LNG seamless steel pipe with dimensional accuracy and internal and external surface quality meeting the requirements of ASTM / ASME technical specifications, and realizes true nationalization research of LNG seamless steel pipes.
Description
Technical field [0001] The invention relates to the field of ultra-low temperature seamless steel pipes, in particular to a production method of low-temperature seamless steel pipes for liquefied natural gas. Background technique [0002] With the rapid development of my country's economy, the domestic petroleum, chemical and other energy industries need a large amount of low-temperature steel to manufacture various liquefied petroleum gas, liquid ammonia, liquid oxygen, and liquid nitrogen production and storage equipment. Because LNG has flammability and ultra-low temperature, compared with general low-temperature pressure vessels, steel pipes for storage and transportation must have comprehensive characteristics such as strength, thermal stress and strain, welding performance, and corrosion resistance. The material is also required to resist brittle crack propagation. Performance, the metallurgical quality and heat treatment process requirements of the steel pipe are extremely...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21C37/06B21B19/04B21B37/74B21B45/00
CPCB21B19/04B21B37/74B21B45/004B21C37/06
Inventor 郭元蓉胡茂会涂露寒吴红
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM