Method for Producing High-Strength Shaped Parts from High-Carbon and High-Manganese Austenitic Steel Castings with TRIP/TWIP Properties

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The patent describes an economical method for manufacturing high-strength parts from austenitic cast steel that contains significant amounts of carbon and manganese and exhibits TRIP/TWIP effects (mechanisms that enhance both strength and ductility). The process involves casting the steel with a specified chemical composition, then shaping the parts by cold working (deforming at temperatures below 200°C) by more than 10%. This results in finished components that are particularly strong and resistant to wear and impact, making them suitable for critical applications like construction and crash-resistant parts.

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• Automotive industry: manufacturing of crash-resistant vehicle components such as body structures, beams, and reinforcement parts.
• Heavy machinery: production of wear-resistant parts like drive shafts, bearings, fastening elements, and structural members.
• Tool making: creation of cutting and striking tools that demand high strength and resistance to deformation.
• Railway and transportation: components subject to dynamic and static loads, such as couplings or joints.
• Cryogenic applications: parts used in low-temperature processes that require both toughness and strength.

BenefitsContent extracted from patent full text and abstract with AI.

• Cost-effective production by eliminating the need for energy-intensive hot working processes.
• The process delivers parts with high strength (up to 2100 MPa tensile strength) and good ductility (allowing for energy absorption in impacts).
• Cold working improves the structure, closing pores and reducing crack susceptibility, resulting in superior quality.
• Ability to create complex and slim geometries, supporting lightweight design and material savings.
• Enhanced wear resistance, leading to longer service life for components under demanding conditions.

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Patent Abstract

The invention relates to an inexpensive method for producing high-strength molded parts from austenitic cast steel with a carbon content of 0.4 to 1.2%, a manganese content of 12 to 25%, a phosphorus content of 0.01 to 1.5%, a silicon content of less than/equal to 3%, and an aluminum content of less than/equal to 3% by mass, groups of iron, and tramp elements due to the melting process. The molten steel is melted using conventional melting methods and cast into shapes or as semifinished products, and the unfinished cast parts are subsequently completed by means of a cold working process of more than 10% in a temperature range below 200 °C. The finished molded parts are used as construction, wear, or crash elements.