The invention provides 1700MPa-grade hot-formed steel with high cold bending performance and a preparation method and application thereof. The surface layer of the hot-formed steel has a soft-phase ferrite structure, the secondary surface layer of the hot-formed steel has a mixed structure of soft-phase ferrite and martensite, and the core layer of the hot-formed steel has a carbon-poor martensite structure. The preparation method comprises any one or a combination of at least two of the following conditions: (A) the coiling temperature after hot rolling is 650-700 DEG C; (B) the pickling speed is less than or equal to 150m/min; (C) the continuous annealing temperature is 780-830 DEG C; (D) the atmosphere in the furnace is mixed gas of nitrogen and hydrogen; and (E) the dew point temperature is-35 DEG C to-17 DEG C. Through fine component design and process integration, the contradiction between the strength and the toughness of the material is successfully solved, double guarantee of high strength and high toughness is achieved, meanwhile, the requirement for light weight is met, and the competitiveness of an existing product is improved.

    本发明提供一种1700MPa级高冷弯性能的热成型钢及其制备方法与应用,所述热成型钢的表层存在软相铁素体组织,次表层存在软相铁素体与马氏体的混合组织,心层存在贫碳马氏体组织。所述制备方法包括以下条件中的任意一种或至少两种的组合:(A)热轧后的卷取温度为650‑700℃;(B)酸洗速度≤150m/min;(C)连续退火的温度为780‑830℃;(D)炉内气氛为氮气与氢气的混合气;(E)露点温度为‑35℃至‑17℃。本发明通过精细的成分设计及工艺整合,成功解决了材料强度和韧性之间的矛盾,实现了高强度高韧性的双重保障,同时满足了轻量化要求,提高了现有产品的竞争力。


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    Titel :

    1700MPa-grade hot-formed steel with high cold bending performance as well as preparation method and application of 1700MPa-grade hot-formed steel


    Weitere Titelangaben:

    一种1700MPa级高冷弯性能的热成型钢及其制备方法与应用


    Beteiligte:
    CHAI ZHISONG (Autor:in) / LU QI (Autor:in) / SHU JUN (Autor:in)

    Erscheinungsdatum :

    28.02.2025


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Chinesisch


    Klassifikation :

    IPC:    C22C Legierungen , ALLOYS / B60J WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES , Fenster, Windschutzscheiben und bewegbare Dächer, Türen oder Ähnliches für Fahrzeuge / B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / B62D MOTOR VEHICLES , Motorfahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS



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