Realize 100%localization, Northeast University helps the Chinese shipping industry to achieve a new leap!

Recently, the world's largest 24,000teu super large container ship is delivered in Shanghai. Many domestic container ships under the same level are under construction at the same time, highlighting the new leap created by China. In the milestone breakthrough in the Chinese ship industry, the Rolling Technology and Rolling Automation National Key Laboratory (RAL) of Northeast University (RAL) in the large container ship is large thickness, high cracking tough steel plate (cracking steel) comprehensive domesticization road Contribute your own strength.

The world's largest 24000TEU super large container ship is delivered

Large thickness stoppersing steel is mainly used in key parts such as the middle of the hull, the top of the cabin on the top, and the top deck edge. It can ensure the safety of the hull structure, resist the spread of large crispy cracks, and prevent catastrophic accidents. However, the production of ships with excellent thickness, high strength, and cracking toughness is extremely difficult to produce: first, the use of linked steel plates to produce special thick steel plates with insufficient rolling compression ratio; second, rolling deformation, penetration and rolling rolling and rolling rolling The rear cooling is uneven in the thickness direction of the steel plate; the third is that the lower final rolling temperature greatly tests the rolling force and torque limit of the thick plate rolling machine.

The application location of large thickness stop steel

In 2013, the International Care Corporate Society proposed the £ 10 ° C cracking toughness ≥6000 n/mm3/2 stop cracking performance indicators, requiring new container vessels to use 50 ~ 75 mm thick anti -cracking steel plate − 10 ° C cracking toughness must be used. ≥6000N/mm3/2. 2. In 2021, the 80 ~ 100 mm thick steel plate − 10 ° C cracked toughness ≥8000N/mm3/2 was included in the international standards Essence Before 2020, only a foreign company could produce 100 mm thick EH47 -stop steel with ≥8000 n/mm3/2, which was able to produce − 10 ° C. ≥8000 n/mm3/2. Domestic products can only produce products with a maximum thickness of 92 mm, and the −10 ° C anti -cracking toughness is 8000 n/mm3/2. There is a significant gap between domestic cracking steel products and international advanced levels.

In this context, Northeast University cooperated with Nanjing Iron and Steel to develop the 50 ~ 92mm series of EH40 and EH47 -stop steel plates in 2018. In 2020, on the basis of the deep understanding of the essence of large thickness and cracking steel, it proposed that the new rolling process and crack-tip "multi-peak" of the new type of rolling process and cracks with a full thickness micro-tissue is refined, uniformly, and weaving control. The fault mode of distributed instructing Nanjing Iron and Steel has taken the lead in developing 100 MM thick EH47 and EH40 -stop steel plates in China. The level completely breaks the technical barrier of high -end cracking tough steel plates abroad.

Develop steel plate crack tip -tip "multi -peak" distribution fault mode and traditional process "single peak" distribution fracture characteristics

At present, Nandan 50 ~ 95mm thick EH40 and EH47 stoppersing steel have been applied to many world's largest 24000TEU container ships, and achieved the world's only supply in the world. In 2021, the China Iron and Steel Industry Association organized an evaluation of Nanjing Iron and Steel "High Cracking Tough Stewed Steel Plate". "International Leading".

The development of 100mm thick and stopped cracking steel nationwide nationwide

Affected by the epidemic, the efficiency of global shipping has been reduced, which has caused tight capacity and the global "buying ship fever" heating up. In 2021, my country's shipbuilding volume, new order volume, and handheld orders accounted for 47.2%, 53.8%, and 47.6%of the world's total, respectively, and continued to maintain the world's leading leadership, and the international competitiveness was further enhanced. According to statistics, the rapid growth of the domestic shipbuilding industry will continue. The high -speed development of the ship industry will have a lot of demand for high -tech cracking steel plates above 90mm. In this context, relying on independent innovation and accelerating core key technologies, it has become an opportunity to gradually improve the domestic industrial chain and support the sustainable development of the Chinese shipping industry. The super large container shipproof steel -stop steel in China to achieve 100%of domesticization in the crisis is the best proof, marking the transformation of the character transformation of "following, merging, and leading" in China. The ranks of advanced internationally, which reflects China's new heights.

In the next five years, the domestic shipbuilding industry has continued to grow high -speed growth

The new NEU-Rolling rolling process developed by RAL creative development, refine the full thickness of the thick steel plate, and break through the constraints of too low compression to the thickness of the steel plate. Related technologies can be promoted and applied to other products that have required to stop cracking properties such as hydropower, containers, etc., and solve the key common problems that restrict the development of high -strong toughness and thick steel plates in my country's steel industry.

In recent years, RAL's key common technology issues for the development of the metallurgical industry have carried out research on high -quality, low -cost green rolling technology and high -quality steel materials, and provided many original theory and key technologies for technological innovation in the rolling field. Reserve is the core force of China in the field of rolling from "following" to "leading".

Source | China Metallurgical Daily Metallurgical Media Rolling Technology and National Key Laboratory

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