Hyundai Steel. has been granted a patent for a method of manufacturing hot-stamped parts. The process involves heating a blank in a furnace with specific temperature conditions, resulting in low diffusion hydrogen levels (under 0.45 ppm) and a corrosion rate of 3×10-6 A or less. GlobalData’s report on Hyundai 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 Hyundai Steel, Hydrogen fuel cells was a key innovation area identified from patents. Hyundai Steel's grant share as of July 2024 was 63%. Grant share is based on the ratio of number of grants to total number of patents.
Hot-stamped part with controlled heating and low corrosion
The patent US12070785B2 outlines a novel manufacturing method for producing hot-stamped parts, emphasizing a specific heating process that enhances the material properties of the final product. The method involves inserting a blank into a heating furnace designed with distinct heating and soaking sections. During the manufacturing process, the blank undergoes step heating as it traverses the heating sections, followed by a soaking phase at temperatures ranging from Ac3 to 1,000° C. A critical aspect of the method is the temperature condition defined by the formula 0<(Tg-Ti)/Lt<0.025° C./mm, where Tg is the soaking temperature, Ti is the initial temperature of the furnace, and Lt is the total length of the heating sections. The resulting hot-stamped part exhibits low diffusion hydrogen levels (less than 0.45 ppm) and a corrosion rate of 3×10-6 A or less, indicating enhanced durability.
The claims further specify the mechanical properties of the hot-stamped parts produced through this method. The parts can achieve varying tensile strengths depending on their composite structures: between 500 MPa and 800 MPa with a ferrite and martensite structure; between 800 MPa and 1,200 MPa with a bainite and martensite structure; and between 1,200 MPa and 2,000 MPa with a full martensite structure. This range of tensile strengths and composite structures suggests that the patented method allows for the production of high-performance materials suitable for various applications, particularly in industries requiring robust and corrosion-resistant components.
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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.
