Group 1 - Nanjing Steel Co., Ltd. has applied for a patent for a type of steel plate designed for icebreaking ships in extremely cold environments, with a yield strength of ≥390MPa and tensile strength of ≥510MPa [1] - The chemical composition of the steel plate includes specific percentages of elements such as C, Si, Mn, P, S, V, Ni, Cr, Nb, Al, Ti, Ca, and N, ensuring its mechanical performance at temperatures as low as -60°C [1] - The patent application was filed on April 2025, and the publication number is CN120272838A [1] Group 2 - Nanjing Steel Co., Ltd. was established in 1999 and is primarily engaged in the smelting and rolling processing of ferrous metals [2] - The company has a registered capital of approximately 616.51 million RMB and has invested in 58 enterprises [2] - Nanjing Steel has participated in around 5000 bidding projects and holds 4537 patents along with 18 trademark registrations [2]