United States Steel has patented a high-strength rolled steel sheet product featuring a specific composition and a two-step annealing process. This innovation results in favorable mechanical properties, including high tensile strength and formability, making it suitable for industries like automotive manufacturing. GlobalData’s report on United States Steel 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 United States Steel, Anti-corrosive metal tyre reinforcements was a key innovation area identified from patents. United States Steel's grant share as of June 2024 was 91%. Grant share is based on the ratio of number of grants to total number of patents.
High strength rolled steel sheet with controlled compositions
The granted patent US11993823B2 describes a high strength rolled steel sheet product characterized by specific chemical compositions and microstructural features. The steel sheet contains carbon (C) in the range of 0.12 to 0.5 weight percent, manganese (Mn) from 1 to 3 weight percent, and a combination of silicon (Si) and aluminum (Al) totaling 0.8 to 3 weight percent, with the balance being iron (Fe). The product undergoes a two-step annealing process, resulting in a microstructure that includes ferrite, equiaxed retained austenite grains with an average aspect ratio of less than 2.0:1, and minimal fresh, untempered martensite. The steel sheet exhibits a combination of ultimate tensile strength (UTS) and total elongation (TE) exceeding 25,000 MPa % and a hole expansion ratio of at least 30 percent.
Further claims detail additional compositional parameters, including specific ranges for Si, Al, titanium (Ti), and niobium (Nb). The retained austenite is specified to have an average grain size of less than 10 microns, with some claims narrowing this to less than 0.5 microns. The ultimate tensile strength is noted to range from 720 to 1,100 MPa, with total elongation of at least 20 percent. The patent also mentions the potential for a zinc-based coating on the steel sheet and specifies that the product can be hot rolled. Overall, the claims emphasize the unique combination of mechanical properties and microstructural characteristics that contribute to the high strength and ductility of the rolled steel sheet product.
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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.
