High-strength and high-toughness medium manganese steel and preparation method thereof

By employing specific chemical compositions and processes, a dual-phase microstructure of ferrite and austenite with high strength and toughness is formed, solving the toughness problem of medium manganese steel in low-temperature environments, achieving a balance between strength and plasticity, and reducing the risk of central segregation and delayed cracking.

CN121592969APending Publication Date: 2026-03-03SHANDONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202511980470.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-03-03

AI Technical Summary

Technical Problem

Traditional medium manganese steel is difficult to meet the toughness requirements of cold regions such as B-pillars and anti-collision beams in low-temperature environments, and increasing the Mn and C content will lead to the risk of central segregation and delayed cracking.

Method used

By employing specific chemical compositions and processes, including electric furnace smelting, vacuum degassing, controlled rolling, ultra-fast cooling and laminar flow cooling, critical zone annealing and low-temperature tempering, a dual-phase structure of ferrite and austenite with high strength and toughness is formed, and the microstructure ratio is controlled and the grain size is refined.

Benefits of technology

It significantly improves the strength and toughness of medium manganese steel, meeting the safety requirements of cold regions, while reducing the risk of center segregation and delayed cracking, ensuring the stability of plate shape and dimensions.

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Abstract

The invention relates to the technical field of medium manganese steel, in particular to high-strength and high-toughness medium manganese steel and a preparation method thereof.The preparation method is characterized by comprising the steps that S1, smelting is conducted through an electric furnace according to the chemical component ratio of the medium manganese steel, then refining is conducted through a ladle refining furnace, then vacuum degassing treatment is conducted through a vacuum circulation degassing method, and then continuous casting is conducted to form a plate blank with the thickness being 200-300 mm; s2, the plate blank is heated to 1150-1250 DEG C in a walking beam furnace, heat preservation is conducted for 2-4 hours, and then a controlled rolling technology is adopted to machine the plate blank into a steel plate within the range of 4-20 mm; s3, after rolling is completed, the steel plate is treated through a composite cooling technology of ultra-fast cooling and laminar cooling; s4, the cooled steel plate is heated to 750-850 DEG C, heat preservation is conducted for 10-60 minutes, and a ferrite and austenite double-phase structure is formed; the comprehensive performance is greatly improved, and excellent strength, plasticity, low-temperature toughness and welding adaptability are shown.
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