Daido Steel patented a mold steel with specific composition for improved performance. The steel has high hardness (58-61 HRC), good thermal conductivity (20 W/(m·K) or more), and defined crystal grain size (5 or more). The steel is designed for molds, offering enhanced durability and efficiency. GlobalData’s report on Daido 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 Daido Steel, Hydrogen fuel cells was a key innovation area identified from patents. Daido Steel's grant share as of March 2024 was 37%. Grant share is based on the ratio of number of grants to total number of patents.

Steel for mold with specific composition, hardness, and thermal conductivity

Source: United States Patent and Trademark Office (USPTO). Credit: Daido Steel Co Ltd

A recently granted patent (Publication Number: US11952640B2) discloses a unique steel composition designed for molds, particularly suited for hot stamping molds. The steel composition includes specific percentages of carbon, silicon, manganese, chromium, molybdenum, tungsten, vanadium, nitrogen, niobium, zirconium, tantalum, and cobalt, along with certain impurity limits. The steel, after quenching and tempering, exhibits a hardness between 58 HRC and 61 HRC, a thermal conductivity of 20 W/(m·K) or more, and a crystal grain size of 5 or more. Additionally, the steel may contain additives like niobium, zirconium, tantalum, and cobalt within specified ranges to enhance its properties.

Furthermore, the patent claims cover the steel's characteristics post-quenching and tempering, including a grain size of crystallized carbide of less than 25 km. The patent also extends to the use of this specialized steel in molds, particularly highlighting its application in hot stamping molds. The steel's composition, which also includes specific carbon and nitrogen percentages, is crucial in achieving the desired properties for molds, ensuring optimal performance and longevity. Overall, the patent provides a detailed insight into the development and application of this innovative steel composition for molds, emphasizing its unique properties and potential benefits in various industrial applications.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

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.