Acid-resistant steel and preparation method and application thereof
By controlling the content of elements such as C, Mn, Cr, and Sb and using hot and cold rolling processes, high-strength acid-resistant steel was prepared, solving the problem of poor acid resistance of existing acid-resistant steel and improving the corrosion resistance and service life of the car body.
CN117845130BActive Publication Date: 2026-06-19SHOUGANG GROUP CO LTD +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHOUGANG GROUP CO LTD
- Filing Date
- 2023-12-29
- Publication Date
- 2026-06-19
AI Technical Summary
Technical Problem
The existing acid-resistant steel has poor acid resistance, which makes the carriage body susceptible to corrosion in corrosive media, affecting its service life.
Method used
By controlling the content of elements such as C, Mn, Cr, and Sb, a Cr2O3 protective film is formed to inhibit the anodic reaction. Combined with reasonable hot rolling and cold rolling processes, acid-resistant steel with high strength and acid resistance is prepared.
Benefits of technology
The yield strength of acid-resistant steel is ≥1000MPa, tensile strength is ≥1100MPa, elongation is ≥5%, and the resistance to sulfuric acid corrosion is improved by more than 50%, thus extending the service life of the carriage.
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Figure CN117845130B_ABST
Abstract
This application relates to an acid-resistant steel, its preparation method, and its application. The chemical composition of the acid-resistant steel includes: C, Si, Mn, P, S, Al, Nb, V, Cr, Sb, Ni, N, and Fe; wherein, by mass fraction, the content of C is 0.010%–0.025%, the content of Mn is 0.2%–0.4%, the content of Cr is 1.3%–2.0%, the content of Sb is 0.03%–0.07%, and the content of Ni is 0.05%–0.10%; and satisfies the following relationship: [Ni] / [Sb]≥1.0. The acid-resistant steel has a yield strength of over 1000 MPa, a tensile strength of over 1100 MPa, and an elongation of over 5%, while its sulfuric acid corrosion resistance is improved by over 50% compared to Q345, and it does not crack when bent at a small angle of 90°d=1a.
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Citation Information
Patent Citations
A hot-rolled steel plate resistant to atmospheric corrosion for railway freight cars and its manufacturing method
CN102268613A