At 7:58 am on April 13, 2023, with the order of Zhang Shujiang, the general manager of Jilin Xinda Steel Co., Ltd., the production of prestressed steel bars in the converter of the steelmaking plant officially began. A series of square and red bright cast billets were slowly sent out by the conveyor roller of the continuous casting machine. After testing by the spectrum room of the quality and accounting department, the composition and appearance of the steel billets fully comply with national standards and internal control standards, with a qualification rate of 100%, marking the successful production and development of prestressed steel bars for the first time! Subsequently, the Wire Rod Branch of the Steel Rolling Plant coordinated and cooperated with various departments to test roll prestressed steel bars φ 12 rounds achieved a one-time success, and all appearance and performance indicators meet the standards!

The company has established a pre-stressed steel bar development team, led by General Manager Zhang Shujiang. After technical exchange, the team introduced non refined slag washing technology and held three special meetings on pre-stressed steel bar development on February 16, February 21, and April 10 to determine the development direction, process route, formulate technical regulations, and development time. With the joint efforts of the technical department, steelmaking plant, supply department, quality control department, production department, sales department, and information automation department, as well as the active cooperation of the raw material factory and ironmaking plant, the development and smelting task of prestressed steel bars was completed in just two months.

It is understood that the smelting of this steel grade adopts processes such as adding slag washing material and implementing protective casting, electromagnetic stirring, etc., to ensure that the prestressed steel billet reduces non-metallic inclusions and total oxygen content, and improves the mechanical properties of the product.

To ensure the successful one-time smelting of prestressed steel bars, General Manager Zhang Shujiang and General Manager Assistant Lu Guangjun of the company went to the production site of the steelmaking plant to understand the production preparation situation, and focused on providing on-site guidance for processes such as converter smelting, argon blowing, protective casting, continuous casting water distribution, and electromagnetic stirring.

During the smelting process, the operators of each position in the converter workshop of the steelmaking plant strictly adhere to the requirements of operating points and process discipline, so that the steel smelting process is always under control, and the composition of the steel and all process indicators meet the expected requirements; Personnel from various positions such as the large ladle, middle ladle, and water distribution of the continuous casting machine carefully operate to fully control parameters such as casting speed and middle ladle temperature within the specified range. The leaders of relevant departments and offices of the company, as well as the technical personnel of the converter and continuous casting workshops, supervise and guide the production process control on site, and promptly coordinate and handle any problems found, ensuring that the various process parameters of the steel smelting and casting process meet quality requirements.

On April 14th, it was learned from the Wire Rod Branch of Jilin Xinda Steel Rolling Plant that the prestressed steel bars had been completed φ The 12 round trial rolling has high strength and toughness, low relaxation, and strong adhesion to concrete. It has good weldability, forging ability, and material saving characteristics, and is widely used in high-strength prestressed concrete centrifugal pipe piles, poles, elevated bridge piers, railway sleepers, and other prestressed components. It has a very broad market at home and abroad.

To ensure this φ Successfully rolled 12 gauge prestressed steel bars, under the guidance of the Beijing University of Science and Technology team, combined with the early stage φ 12 gauge HPB300 and φ 6.5 Specification Q195L production practice, carefully formulated production plan. During the trial rolling process, technical personnel from Beijing University of Science and Technology actively tracked the entire process on site, adjusted the size of the test material, ensured that the appearance and size of the steel meet the requirements, and established a suitable heating temperature range and strict furnace time control to ensure that the steel billet heating meets the rolling requirements and prevent the formation of too deep decarburization layer. Develop flow control for each section of the water tank to ensure that the inlet and outlet temperatures meet the process requirements. Adjusting fan parameters to weaken air cooling control, installing insulation covers to control cooling rate, and other measures to ensure good organization. In addition, based on the sample inspection results, the production process is quickly, accurately, and scientifically adjusted, and the optimal rolling process is adopted to ensure stable and qualified wire rod performance.

Diligent in sharpening, innovative tools that have remained strong over time. Faced with the new market situation and development requirements, Jilin Xinda Iron and Steel Co., Ltd. adheres to innovation as the primary driving force, plays the role of the research and development main body of the Jilin Provincial Enterprise Technology Center, deeply explores the integrated model of practical research, production and sales, grasps the key points and breakthroughs, and has achieved phased results in new product development, new market development, and new channel construction. The successful production of prestressed steel bars marks a new breakthrough in the variety development technology of Jilin Xinda Steel without refining conditions, achieving a historic transformation from building materials to processing materials.

Plan a game of chess, work hard, and achieve success with one mind! Jilin Xinda Iron and Steel Co., Ltd. will adhere to the path of advantages, carry forward the spirit of "traveling through countless mountains and rivers, trying every means, speaking a thousand words, and enduring countless hardships", concentrate on promoting manufacturing technology research, accelerating the development progress of potential varieties of steel, turning ordinary steel into high-quality products, moving from ordinary to high-end, improving the overall quality, sales, and efficiency of varieties of steel, with higher quality and faster speed Moving towards a higher level of industry benchmark!