Corrosion-resistant alloy steel bar and preparation method therefor

By optimizing the composition and processing of corrosion-resistant alloy steel bars to reduce Cr and Mo content and incorporating specific elements, the bars achieve excellent mechanical and corrosion-resistant properties at lower production costs, addressing the cost limitations of existing technologies.

EP4484600A1Pending Publication Date: 2025-01-01INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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Patent Information

Application Number
EP2023825756
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-06-22
Filing Date
2023-01-18
Publication Date
2025-01-01

AI Technical Summary

Technical Problem

The high content of Cr and Mo in existing corrosion-resistant steel bars results in high production costs, limiting their application in reinforced concrete structures.

Method used

A corrosion-resistant alloy steel bar composition with reduced Cr and Mo content, utilizing Si, Mn, Cr, Ni, O, S, Ti, Al, and V to maintain excellent mechanical properties and corrosion resistance, along with a smelting and rolling process that includes continuous casting and controlled cooling to achieve a ferrite and pearlite duplex structure, reducing production costs.

Benefits of technology

The solution achieves excellent mechanical properties and corrosion resistance while significantly reducing production costs, making the alloy steel bars more suitable for actual production and processing without the need for added Mo, and enhancing their durability and resistance.

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Abstract

Provided in the present application are a corrosion-resistant alloy steel bar and a preparation method therefor, wherein the corrosion-resistant alloy steel bar comprises, in percentage by weight: 0.05-0.25% of C, 1.05-2% of Si, 0.3-1.5% of Mn, 0.5-2.5% of Cr, 0.05-1% of Ni, 0.001-0.005% of O, 0.001-0.0035% of S, 0.005-0.1% of Ti, 0.005-0.1% of Al, 0.005-0.03% of V, and 0.005-0.03% of Nb, with the balance being Fe and inevitable impurities. The preparation method therefor comprises the successive steps of smelting, refining, continuous casting, rolling and cooling. In the present application, elements such as Si, Ti, Al and Mn are used for compensating for the reduction in corrosion resistance caused by a decrease in the content of Cr, such that the production cost of the corrosion-resistant alloy steel bar are greatly reduced.
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Citation Information

Patent Citations

  • A corrosion-resistant alloy steel bar and its preparation method

    CN114790532B