CITIC Group has patented a method for producing low-carbon, nitrogen-containing austenitic stainless steel bars. The process involves smelting, electroslag remelting with a specific slag composition, and forging techniques, resulting in high-strength steel with uniform chemical composition and high purity. GlobalData’s report on CITIC Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on CITIC Group, was a key innovation area identified from patents. CITIC Group's grant share as of June 2024 was 62%. Grant share is based on the ratio of number of grants to total number of patents.
The granted patent US12024754B2 outlines a method for manufacturing a low-carbon, nitrogen-containing austenitic stainless steel bar. The process begins with smelting to produce a steel ingot, followed by electroslag remelting using a specific slag composition that includes CaF2, Al2O3, CaO, and MgO in defined weight percentages. The crystallized steel ingot is then subjected to a soaking treatment at temperatures between 1130-1150°C, followed by a series of forging steps that include upsetting-and-drawing and radial forging. The forging process is characterized by specific temperature ranges and deformation methods, ultimately leading to air cooling to form a stainless steel bar with a diameter of 200 mm. The composition of the final product is meticulously defined, including controlled percentages of carbon, silicon, manganese, sulfur, phosphorus, chromium, nickel, copper, cobalt, nitrogen, boron, and niobium/tantalum.
Additional claims detail variations in the slag composition, the specific parameters for the electroslag remelting process, and the conditions for the forging steps. The method also includes pre-treatment steps such as cutting and surface-polishing the steel ingot to create an electrode bar for remelting. The patent specifies the mechanical properties of the resulting stainless steel bar, indicating that it achieves significant tensile and yield strengths at both room temperature and elevated temperatures. This comprehensive approach to manufacturing aims to enhance the performance characteristics of the stainless steel bar while maintaining low carbon and nitrogen content, which is critical for its intended applications.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
