ArcelorMittal has filed a patent for a cold rolled, annealed, and partitioned steel sheet with specific composition and microstructure. The steel sheet includes elements such as carbon, manganese, molybdenum, boron, and optional elements like aluminum, silicon, titanium, niobium, chromium, and vanadium. The microstructure consists of ferrite, retained austenite, and partitioned martensite. The patent claim details have been canceled. GlobalData’s report on ArcelorMittal 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 ArcelorMittal, photovoltaic roof tiles was a key innovation area identified from patents. ArcelorMittal's grant share as of September 2023 was 64%. Grant share is based on the ratio of number of grants to total number of patents.
The patent filed is for a cold rolled steel sheet
A recently filed patent (Publication Number: US20230295782A1) describes a cold rolled, annealed, and partitioned steel sheet with specific composition and properties. The steel sheet is made of a steel alloy containing carbon (C) between 0.05% and 0.18%, manganese (Mn) between 6.0% and 11.0%, molybdenum (Mo) between 0.05% and 0.5%, boron (B) between 0.0005% and 0.005%, and sulfur (S) less than or equal to 0.010%, phosphorus (P) less than or equal to 0.020%, and nitrogen (N) less than or equal to 0.008%.
The patent claims specify various ranges for the composition and microstructure of the steel sheet. The carbon content is between 0.08% and 0.15%, while the manganese content is between 6.0% and 9.0%. The steel sheet may also contain aluminum (Al) between 0.2% and 2.2%. The microstructure of the steel sheet can consist of different proportions of ferrite, retained austenite, and partitioned martensite, ranging from 5% to 25% ferrite, 15% to 30% retained austenite, and 45% to 80% partitioned martensite. Alternatively, the microstructure can have no ferrite, 20% to 30% retained austenite, and 70% to 80% partitioned martensite.
The steel sheet has specific mechanical properties, including a tensile strength above or equal to 1270 MPa, uniform elongation (UE) above or equal to 10.0%, and total elongation (TE) above or equal to 14.0%. The steel sheet must also satisfy an equation involving tensile strength, elongation, carbon content, and silicon content. The hole expansion ratio of the steel sheet is above or equal to 15%, and the yield strength is above or equal to 1000 MPa. The LME index, which measures the susceptibility to liquid metal embrittlement, is below 0.36. The steel sheet also has a carbon equivalent (Ceq) lower than 0.4%, calculated based on the composition of the steel.
The patent also describes a resistance spot weld made of two steel parts using the cold rolled, annealed, and partitioned steel sheet. The resistance spot weld has a specific a value of at least 30 daN/mm2.
Additionally, the patent includes a press hardened and partitioned steel part with a composition similar to the steel sheet. The steel part may contain additional elements such as aluminum, silicon, titanium, niobium, chromium, and vanadium. The microstructure of the steel part consists of ferrite, retained austenite, partitioned martensite, and fresh martensite in specific proportions. The carbon and manganese content in the austenite is controlled to maintain a ratio below 18.0.
Overall, this patent describes a specific composition and microstructure for a cold rolled, annealed, and partitioned steel sheet with desirable mechanical properties and weldability. The steel sheet can be used in various applications that require high strength and ductility.
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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
