Low-carbon micro-nano structure bainite steel based on chemical heterogeneity regulation and control and preparation method of low-carbon micro-nano structure bainite steel

The method for preparing low-carbon micro/nano-structured bainitic steel by controlling chemical heterogeneity utilizes Mn and Cr elements to regulate the driving force of bainitic phase transformation, combined with rapid heating technology of cold-rolled pearlite, to solve the problems of high cost and complex process of low-carbon micro/nano-structured bainitic steel alloys in the prior art, and achieves high strength and toughness matching and shortened preparation cycle.

CN120989506APending Publication Date: 2025-11-21GUANGDONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202511146282.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-15
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

Existing technologies for preparing low-carbon micro/nano-structured bainitic steel suffer from high alloy costs, complex processes, and difficulty in achieving a high strength-toughness balance, which restricts its industrial production. Furthermore, existing methods are not effective in shortening the preparation cycle.

Method used

A method for preparing low-carbon micro/nano-structured bainitic steel based on chemical inhomogeneity regulation is adopted. The original austenitic grains are refined by cold-rolled pearlite rapid heating technology, and the micro-chemical inhomogeneity is controlled to accelerate the isothermal phase transformation of bainite. The driving force of bainite phase transformation is controlled by heterogeneous regulation of Mn and Cr elements. Combined with the refinement of the original austenitic grains after cold rolling, austenite nucleation is promoted to form metastable residual austenite with heterogeneous Mn/Cr distribution.

Benefits of technology

This study achieved efficient preparation of low-carbon micro/nano-structured bainitic steel, significantly shortening the preparation cycle, improving strength and toughness, increasing production efficiency, and reducing alloy costs.

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Abstract

The invention particularly relates to low-carbon micro-nano structure bainite steel based on chemical heterogeneity regulation and control. The low-carbon micro-nano structure bainite steel comprises the following components of 0.25%-0.45% of C, 1.4%-2.2% of Si, 1.5%-3.0% of Mn, 1.0%-3.0% of Cr, 0.7%-2.0% of Ni, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S and the balance Fe. The preparation method of the low-carbon micro-nano structure bainite steel comprises the following steps: sequentially carrying out smelting, hot rolling, homogenization, pearlisation and cold rolling treatment on the alloy steel containing the components to obtain a cold-rolled pearlitic initial structure with heterogeneous Mn / Cr distribution. And the cold-rolled sheet is rapidly heated to be austenitized for short-time heat preservation, and then isothermal quenching is conducted to complete isothermal phase change of the micro-nano structure bainite. According to the invention, the cold-rolled pearlite rapid heating technology is utilized to refine the original austenite grains and regulate and control the microchemical heterogeneity, so that the double targets of short preparation period and excellent obdurability matching of the low-carbon micro-nano structure bainite steel are achieved.
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