Research on Secondary Cold Rolling (DCR) Products and Core Technology
Baosteel secondary cold rolling: high-strength and ultra-thin, energy-saving packaging, breaking foreign monopoly.
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Applicable industry
Applications
Key innovations
The innovation of this product lies in its "thinned-down" design, achieving higher strength and thinner thickness, significantly saving materials, filling domestic gaps and breaking foreign technology monopoly.
Potential economic benefits
This green technology product significantly reduces manufacturing costs and enhances product market competitiveness through material thinning and thickening and performance improvement. It broke the monopoly of foreign technology, filled domestic gaps, achieved product serialization, and successfully expanded the international market. In the past three years, 1.
Potential climate benefits
The "thinning" design reduces the amount of steel required per unit of packaging, significantly reducing energy consumption and carbon emissions for steel production. Lighter packaging also reduces the carbon footprint of product transportation and improves overall carbon reduction benefits.
Solution supplier
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Baoshan iron and steel Co., Ltd.
Baoshan Iron and Steel Co., Ltd. is the world's leading comprehensive steel company, providing high-quality steel and empowering many industrial fields such as automobiles, home appliances, and construction.
Shanghai，China
Solution details
- Project background:
With energy conservation and emission reduction requirements and increasingly fierce market competition, cold-rolled packaging materials continue to develop in the direction of conservation-oriented "thinning", especially secondary cold-rolled tinplate and chrome-plated plate. Compared with traditional one-cold-rolled products, its thickness is reduced, its strength is improved, and at the same time, it has good processability and is welcomed by users. Relying on the country's first professional secondary cold rolling production line, faced with product and process gaps, and in response to user needs, Baosteel has independently established a project to develop advanced steel products. After 10 years of independent development, this project not only broke the foreign technology blockade, but also broke through the secondary cold rolling process The key control technology of the process has formed a complete set of secondary cold rolling process and consistent technology suitable for Baosteel. It has been recognized as 42 technical secrets of Baosteel and authorized and accepted 16 national patents. Baosteel has added DR-7MCA, DR-8BA, DR-8CA, DR-8MCA, DR-9CA and other varieties to its tinned and chrome-plated plate products, achieving Baosteel's product goals of "the most complete varieties and specifications, the most stable quality, and the lowest cost., the most competitive cost performance ratio, and the best service and user use technology research" have also filled the gap in secondary cold rolling products in China. This product series was identified as a high-tech achievement transformation project in Shanghai City in 2014. - Technical principles and performance indicators:
Based on the specific properties of secondary cold rolled products, a certain amount of composition is designed with a certain range of hot rolling, primary cold rolling and annealing processes. After going through the secondary cold rolling mill (DCR), the strip steel is given the required mechanical properties suitable for its intended use., and the strip steel is rolled into the required finished surface.
The main technologies of this project include:
- The developed secondary cold rolling products have higher strength and thinner thickness, mastering DR7~The consistent production technology and application technology of the DR9 series;
- Mastered the production technology of controlling the isotropic products of DR materials and solved the problem of "ear making" for flushing cans;
- The material has been successfully developed with a strong baking hardening effect. The product is relatively easy to press in production and users. The hardness increases greatly after processing, coating and baking by users, which can meet the strength requirements of can-making products and solve the problem well. The contradiction between product strength and thinning;
- Production technology of consistent products to solve and improve the welding performance of three-piece cans: There is a type of steel in this series that uses nitrogen instead of carbon as a strengthening element. High hardness and weldability are achieved through consistent manufacturing process design and control;
- Pioneering the unwinding tension setting method, two-high tension roll tension amplification technology, winding tension and pressing roll technology suitable for secondary cold rolling mill production, suitable for the production of extremely thin and extremely hard strip steel;
- Developed unique comprehensive control technologies for cooling water flow, emulsion spraying, and cutting water adjustment that meet cooling, lubrication, and surface quality control, so that rolling stability and surface quality are simultaneously improved;
- Develop a unique plating surface control technology, which is especially suitable for the production of high-quality tin-plated and chrome-plated plate secondary cold rolling products.
- Main product performance indicators:
Hardness range of main secondary cold rolled products (HR30T) 6585. Yield strength range 520690Mpa; high elongation secondary cold rolling strength range 480~550Mpa, elongation greater than 5%; bake hardening value of bake hardening secondary cold rolling products is greater than 20Mpa; ear making rate is less than 5%. - Application situation
The secondary cold-rolled tinned steel sheet for this project is a new type of material that can be used in high-demand shallow drawing cans and unscrewing caps. This product was mass produced in Baosteel in 2007 and was used in 2010 for DRD cans and unscrewing caps. Sales of secondary cold-rolled materials such as low-making ears reached 6623 tons, and sales volume in 2013 was 173,800 tons. The products are exported to Europe, America, Asia-Pacific and other countries and regions, creating good economic benefits for Baosteel, with a profit of approximately 150 million yuan in the past three years. With the strengthening of domestic and foreign market development efforts, the sales volume of materials for this project will increase year by year, and it is expected that sales will exceed 200,000 tons in 2015.
At the same time, EVI is involved in domestic can-making and capping factories in advance, drawing on the technical experience of exporting foreign countries to promote the upgrading of domestic users 'can-making and capping levels, and drive the improvement of technology and quality in China's packaging industry.
Last updated
11:23:06, Nov 04, 2025
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