JFE. has been granted a patent for a high-ductility, high-strength electrolytic zinc-based coated steel sheet. The innovation features a specific steel composition and microstructure, achieving a tensile strength of 1.320 MPa or more, with significant percentages of martensite and bainite, enhancing its mechanical properties. GlobalData’s report on JFE 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 JFE, Polymer electrolyte fuel cells was a key innovation area identified from patents. JFE's grant share as of June 2024 was 54%. Grant share is based on the ratio of number of grants to total number of patents.
The patent US12043884B2 describes a high-ductility, high-strength electrolytic zinc-based coated steel sheet characterized by specific mechanical properties and a defined chemical composition. The steel sheet exhibits a tensile strength of at least 1.320 MPa and an elongation of 7.0% or more, with a ratio of tensile strength to elongation (TS/El) of 12.000 MPa-% or greater. The base steel sheet's composition includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), aluminum (Al), nitrogen (N), and antimony (Sb), with the balance being iron (Fe) and incidental impurities. The microstructure of the steel is predominantly martensite and bainite, with specific requirements for carbide particle size and distribution, as well as a low diffusible hydrogen content.
The patent also outlines a method for producing this coated steel sheet, which involves several steps: hot-rolling a steel slab at high temperatures, followed by controlled cooling, annealing, and electrolytic zinc-based coating. The process includes specific temperature ranges and cooling rates to achieve the desired microstructure and mechanical properties. Additionally, the method may incorporate a cold-rolling step and a tempering step to further enhance the material's characteristics. The claims emphasize the importance of precise control over the composition and processing conditions to produce a steel sheet that meets the specified performance criteria.
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