High-toughness non-quenched and tempered steel, hot-forged part and preparation method thereof

CN118345311BActive Publication Date: 2026-10-16DONGFENG COMML VEHICLE CO LTD
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Patent Information

Application Number
CN202410514529.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-26
Publication Date
2026-10-16
Estimated Expiration
2044-04-26

AI Technical Summary

Technical Problem

[0004]本申请提供一种高强韧非调质钢、热锻零件及其制备方法，以解决相关技术中零件强度等级不足的问题

Benefits of technology

[0029] The high-strength and high-toughness non-quenched and tempered steel of this application ensures uniform cross-sectional properties of the manufactured parts through the matching of different alloying elements such as C, Mn, Cr, and Si, with a tensile strength ≥1100MPa. By adding composite microalloying elements such as Ti, Nb, Al, N, and B, a large number of dispersed carbonitride particles are formed in the material matrix to refine the grains and mitigate the risk of reduced plasticity and toughness under high strength. The addition of trace amounts of V forms vanadium carbonitride, which refines the grains and improves the strength after tempering. At the same time, it meets the requirements of a carbon equivalent Ceq of 0.8-1.2% and a microalloying matching coefficient I of 0.08-0.15%, ensuring a yield strength of ≥800MPa and an impact energy of ≥50J for hot forgings, thus solving the problem of insufficient strength grades of parts in related technologies.

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Abstract

The application relates to a high-toughness non-quenched and tempered steel, a hot-forged part and a preparation method thereof, and relates to the technical field of non-quenched and tempered steels. The high-toughness non-quenched and tempered steel comprises the following components in percentage by weight: C: 0.15-0.35 wt.%, Si: 0.5-1.5 wt.%, Mn: 1.5-3.0 wt.%, P: 0-0.035 wt.%, S: 0-0.08 wt.%, Cr: 0.3-1.5 wt.%, V: 0.01-0.20 wt.%, Ti: 0.005-0.045 wt.%, Nb: 0.005-0.035%, Al: 0.010-0.040%, B: 0.001-0.005%, N: 0.005-0.020%, and the balance of Fe and inevitable impurities, and satisfies the conditions of a carbon equivalent Ceq of 0.8-1.2% and a microalloy matching coefficient I of 0.08-0.15%. The application can guarantee that the cross-section performance of the prepared part is uniform, the tensile strength is greater than or equal to 1100 MPa, the yield strength is greater than or equal to 800 MPa, and the impact energy is greater than or equal to 50 J, so as to solve the problem of insufficient part strength grade in the related art.
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