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Steel is currently the most widely used and widely used engineering structural material. For steel structures with ultra long service life, such as cross sea bridges, offshore platforms, and ocean going vessels, due to the limitations of in-service online maintenance, corresponding technical means are urgently needed to ensure the anti-corrosion effect of engineering projects.
Corrosion of metal structural components in marine environmental engineering is a global problem, and anti-corrosion technology has become a global focus. It can be roughly divided into: firstly, adjusting the alloy composition in steel to make it corrosion-resistant. The second is to form an anode protection layer by coating with a metal layer, and to protect the steel substrate from corrosion by sacrificing the anode protection layer. In order to address this technical challenge, the Science and Technology Management Department of the Human Resources and Planning Department of Hebei Xinda Iron and Steel Group Co., Ltd. organized the scientific and technological research and development personnel of the two steel companies to implement a patent layout in the technical research and development of the project. 60 patents were laid out in the field of metal coating technology for long profiles, achieving market control through patents.
Hot rolled H-shaped steel and hot-rolled ribbed steel bars for reinforced concrete have become the main construction steel used in modern architecture. Xinda researchers are committed to producing continuous hot-dip galvanized H-beams and hot-rolled ribbed steel bars through the "continuous rolling and plating process" based on surface hydrogen reduction technology; At the same time, the technology of electroplated ribbed steel bars has also been developed. The above technology has applied for 8 invention patents and 32 utility model patents.
The production process of hot-rolled ribbed steel bars by continuous rolling and plating is achieved through sequentially setting up hot rolling equipment, high-pressure water descaling equipment, alkali washing degreasing equipment, online surface hydrogen reduction galvanizing equipment, cooling equipment and chemical passivation equipment, and finished product finishing equipment, etc., to achieve the "continuous rolling and plating" process of hot-rolled ribbed steel bars and online galvanizing. The core point of this technology lies in the surface reduction of hydrogen nitrogen mixed gas and non oxidized galvanizing, eliminating the technical bottleneck problem of high-temperature oxidized iron sheets affecting galvanizing of ribbed steel bars after rolling, which is a huge technological progress in the industry. At the same time, this technology utilizes the high-temperature residual heat energy of hot-rolled products to reduce the unit energy consumption of galvanized products and achieve carbon reduction, which belongs to the low-carbon green product production process.
In addition to technical layout, Xinda researchers also focus on metal coated product testing, making product performance more scientific and reliable. We have developed a series of patents for the method and device of simulating corrosion experiments on hot-rolled H-beams in marine environments, a series of patents for the method and device of soil corrosion testing on hot-rolled H-beams, a series of patents for the method and device of accelerating simulated seawater alternating corrosion and free falling impact testing on reinforced concrete structures after corrosion, and a series of patents for the corrosion simulation testing device of reinforced concrete composite materials. The above technology has applied for 5 invention patents and 15 utility model patents.
Among them, the method and device for simulating corrosion experiments on hot-rolled H-beams in marine environments have achieved the ability to simulate real marine environments in the laboratory and conduct corrosion resistance experiments on hot-rolled H-beams, ultimately obtaining accurate corrosion resistance experimental data of hot-rolled H-beams in marine environments. During the process, the hot-rolled H-shaped steel sample is welded to the experimental base, and then the experimental base is fixed to the base inside the experimental container using fastening bolts; Inject the sampled seawater into the experimental container, use a wave making device to simulate the erosion of hot-rolled H-shaped steel samples by waves, use an incandescent lamp to simulate ocean lighting, use an oxygenation device to simulate the adjustment of oxygen and carbon dioxide content in the seawater in the experimental container, use a temperature control device to simulate the temperature of seawater in the ocean day and night, and use the experimental container in conjunction with an underground storage tank to achieve control of the tidal ocean environment. Conduct experiments on alternating dry and wet seawater erosion.
Hebei Xinda Group has always adhered to placing scientific and technological innovation and intellectual property management in a strategic position, and attaches great importance to cultivating and supporting innovative scientific and technological personnel. In 2023, the technical team achieved remarkable results in the layout of core product patents. Among them, Hebei Xinda Steel authorized 7 high-value invention patents, including "An H-shaped Steel Production Process", "A Strip Cooling Device", and "An Environmentally Friendly Sintering System and Sintering Method". The company has now achieved independent research and development results in iron, steel, and rolling processes, overcoming industry bottlenecks and filling industry gaps in technology. In terms of core patent applications, 16 invention patents have been accepted, 115 utility model patents have been accepted, and 6 core technology patents have been laid out. Hebei Rongxin Steel has implemented a series of patent layouts for the production of continuous hot-dip galvanized hot-rolled ribbed steel bars using surface hydrogen reduction technology. It has applied for 3 invention patents and 9 utility model patents.
In the future, Hebei Xinda Group will adhere to scientific and technological innovation as the focus, accelerate the research and development of core technologies and common technologies in the steel industry, target "high precision and shortage", vigorously promote innovation and efficiency, expand the series of advantageous varieties, and improve the market competitiveness of Xinda products. Strengthen quality upgrading, utilize technological upgrades to achieve innovation led by the production of high-precision and cutting-edge products, continuously stimulate development vitality, and further improve profitability and sustainable development level!
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