[Chemical Equipment Powerful Country and Important Equipment] 455-2011 to achieve large-scale production of domestic nine-nickel steel
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This post was last edited by Swimming Fish in the Desert on 2022-7-27 07:06 Nine-nickel steel is a special steel that is not afraid of cold. 9% metallic nickel is added to it. It "serves" under ultra-low temperature conditions of -162°C and still has good toughness and strength. It is known as the "diamond in the steel world." China imports a large amount of natural gas every year. Only when it is cooled from gaseous state to liquid natural gas in an environment of -162°C can it be transported across the ocean and brought to China on special cargo ships. “At the extreme low temperature of -162°C, ordinary steel is as brittle as biscuits and breaks when touched. It cannot hold liquefied natural gas at all. Only storage tanks made of nine-nickel steel can be used. ”Xie Zhanglong said that this kind of high-end special steel could only be imported. Ten years ago, importing a ton of 9-nickel steel cost more than 20 times the price of ordinary steel plates. In order to overcome this "stuck neck" technology, the "Iron Man" began 15 years of continuous technical research. In September 2007, Nanjing Iron and Steel started serving * * Based on the overall strategic development situation, we concentrated on leveraging the advantages of the "production, marketing, research and application" mechanism, and established the "Nine-Nickel Steel R&D Project Team" to begin the research and development of Nine-Nickel Steel. However, the research and development requirements for nickel-9 steel are extremely high, and the entire process is extremely difficult. Xie Zhanglong said that after the nickel element is oxidized, it will stick to the surface of the steel, causing fish scale-like iron oxide scale to form on the surface of the steel, forming a large number of uneven and small gaps. If it is made into a storage tank and liquefied natural gas comes into contact with these gaps, it will cause cracks in the steel plate, leading to natural gas leakage and even an explosion. From the beginning of research and development, how to improve the purity of molten steel became one of the key difficulties. “Non-metallic inclusions doped in molten steel will affect the properties of the steel. ”Xie Zhanglong said that due to insufficient control, two furnaces of steel were directly scrapped, resulting in a loss of more than 6 million yuan. Faced with the huge investment, R&D personnel are worried that the research and development of this technology will be suspended as a result. However, Nangang's leadership showed full courage and believed that "failure is the mother of success" and must learn lessons from failures. In April 2009, Nanjing Steel successfully smelted the first batch of nine-nickel steel, and in December of the same year successfully rolled nine-nickel steel plates with a thickness of 6-40 mm. In December 2009, the identification of new nickel steel products was completed. “All indicators meet the requirements for the construction and use of LNG storage tanks, the product performance is stable, and the physical quality reaches the international leading level.” In early 2011, Nanjing Iron & Steel Co., Ltd. supplied supplies to PetroChina’s Dalian project, realizing large-scale production of Nickel-9 steel. Xie Zhanglong recalled that as a "rising star" in this field, the market has very strict requirements on the performance indicators of Nangang's products, and some standards are even much higher than those of imported products. However, they have won recognition with their excellent product quality. In May 2013, Nanjing Steel signed a contract with Nantong Pacific Ocean Engineering Co., Ltd. for 7,200 tons of nine-nickel steel for LNG ships, becoming the first domestic manufacturer to mass-produce nine-nickel steel plates for LNG ships. After arduous exploration, Nanjing Iron & Steel Co., Ltd. has successively overcome many difficulties in the industrialization of nickel-9 steel, and its product quality has generally reached the world's advanced level. It has successfully replaced imports and become a * * “"Industrial Strengthening Foundation Project" project. Today, Nangang has the most stable and mature nickel-based steel production technology and production lines in China, has formed a system solution for the production and engineering application of domestic nine-nickel steel plates, and has obtained 5 invention patents. It competes with the world's first-class steel companies and plays the role of "steel backbone".
In terms of 9Ni steel for LNG, Nanjing Steel is currently the only steel mill in China that has the performance of "three barrels of oil" and supplies land, offshore and marine products. It is understood that traditional hot-rolled ribbed steel bars cannot meet the requirements for the construction of cryogenic storage tanks for liquid natural gas below -162°C. Previously, domestic low-temperature steel bars for natural gas storage tanks were completely dependent on imports, and only one or two steel plants abroad could produce them. In June 2012, Nangang President Huang Yixin (then the deputy general manager in charge of R&D and sales) was cooperating with the "Three Major Oils" and learned that they were worried that there were no domestic companies producing low-temperature rebars and that imported products were expensive. The main reason was that many domestic steel companies did not have low-temperature mechanical inspection capabilities. Huang Yixin immediately arranged for the R&D team of Nangang R&D Center to conduct research. After analyzing product performance, process route discussion and inspection and testing capabilities, he believed that Nangang could develop low-temperature threaded steel bars. In the context of the rapid development of the domestic LNG industry, the large demand for steel types, and the lack of localization precedents, Nangang started by comprehensively digesting relevant foreign standards and the design specifications of various LNG receiving stations, and adopted reverse thinking, starting from determining user delivery standards, and working backward to formulate corresponding product standards. On May 21, 2013, Nanjing Iron and Steel Co., Ltd. developed hot-rolled low-temperature ribbed steel bars and passed the scientific and technological achievements appraisal of the China Iron and Steel Association and the China Iron and Steel Industry Association. During this period, Nangang has created a team of technical talents for LNG low-temperature steel and formed a research and development management system with ultra-low temperature as the representative steel type. This has provided production management experience for Nangang's subsequent development of high-quality steel products, and low-temperature steel products have also expanded from plates to long products. At the same time, Nangang also obtained three invention patents including "Ultra-low temperature ribbed steel bars for liquefied natural gas storage tanks and their preparation method", "A device for low-temperature tensile testing of metal materials" and "A low-temperature tensile testing system for threaded steel bars" and two utility model patents "A device for low-temperature tensile testing of metal materials" and "A low-temperature tensile testing system for threaded steel bars".
Like, steel varieties are also the basis for supporting domestic industrial development.
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Nangang already has the most stable and mature nickel-based steel production technology and production lines in China, has formed a system solution for the production and engineering application of domestic nine-nickel steel plates, and has obtained 5 invention patents. It competes with the world's first-class steel companies and plays the role of "steel backbone".