Method for Producing Thin Sheet from a Stainless Austenitic Crmnni Steel

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This patent introduces a method for producing thin sheets (fine sheet) made from a special composition of stainless, austenitic CrMnNi steel (with controlled amounts of manganese, chromium, nickel, molybdenum, nitrogen, carbon, and other elements). The method involves precise melting, casting, hot rolling, pickling, annealing, and cold rolling processes, which are tailored to achieve a fine-grained, highly formable, and corrosion-resistant material. The process allows for the production of ultra-thin, high-strength, and cost-effective stainless steel sheets without copper alloying, making the material competitive with currently available stainless steels, yet at lower material cost.

Use CasesContent extracted from patent full text and abstract with AI.

• Manufacturing of heat exchanger plates and fins, where high strength, good formability, and corrosion resistance are needed.
• Production of components for containers or housings that are exposed to corrosive aqueous environments, such as in the chemical or food industry.
• Automotive parts requiring thin, strong, and corrosion-resistant steel sheets.
• Household appliances (e.g., washing machines, dishwashers) using durable and thin stainless steel sheets.
• Architectural applications where robust, thin, and corrosion-resistant panels are required.

BenefitsContent extracted from patent full text and abstract with AI.

• Reduced cost due to lower nickel content and omission of copper, compared to traditional CrNi stainless steels.
• High formability and processability, allowing thinner sheets with fewer processing steps needed.
• Improved or comparable corrosion resistance compared to standard grades (e.g., 1.4301 and 1.4404), suitable for demanding environments.
• High strength and variable mechanical properties depending on processing, enabling flexible application.
• Efficient, resource-saving production process with minimized need for trimming and annealing, reducing waste and energy.
• Improved recyclability due to absence of copper and other alloying elements that complicate recycling.

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Patent Abstract

The invention relates to a method for producing sheets and strips, in particular fine sheet, from stainless austenitic CrMnNi steel having the following composition: Mn: 7.6 to 8.7 wt%; Cr: 16.5 to 16.99 wt%; Ni: 3.8 to 4.3 wt%; Mo: 0.51 to 1.0 wt%; N: 0.18 to 0.45 wt%; C: