The invention discloses a light-weight automobile top cover rear cross beam lower plate, a preparation method and a rear cross beam assembly. The light-weight automobile top cover rear cross beam lower plate comprises the components of, in percentage by weight, 0.03%-0.10% of C, 1.3%-1.5% of Mn, less than or equal to 0.04% of Si, less than or equal to 0.02% of P, less than or equal to 0.01% of S, larger than or equal to 0.02% of Alt and the balance iron and inevitable impurities. According to the light-weight automobile top cover rear cross beam lower plate, the preparation method and the rear cross beam assembly, high-strength steel is combined with a variable-thickness plate, the light-weight automobile top cover rear cross beam lower plate is prepared by taking the service characteristics of parts into consideration, flexibly drawing materials and carrying out variable-thickness rolling, annealing, leveling and shearing, compared with a laser tailor-welded blank, the light-weight automobile top cover rear cross beam lower plate has the advantages that welding seams are replaced with the transition sections, the light-weight automobile top cover rear cross beam lower plate has better service performance, on the basis of high strength and weight reduction, the defects of tailor-welded welding seams are overcome, automobile light weight is achieved, and automobile industry material light weight is promoted to develop to a higher level.

    本发明公开了一种轻量化汽车顶盖后横梁下板、制备方法和后横梁总成,包含按重量百分数计的如下成分:C:0.03~0.10%、Mn:1.3~1.5%、Si≤0.04%、P≤0.02%、S≤0.01%、Alt≥0.02%,其余为铁和不可避免的杂质。本发明采用高强钢与变厚板结合,从零件服役特性考虑、柔性取材,通过变厚轧制、退火、平整、剪切制备而成;与激光拼焊板相比,该轻量化汽车顶盖后横梁下板以过渡段代替焊缝,具有更优的服役性能,在高强减重的基础上,弥补拼焊焊缝的不足,实现汽车轻量化,推动汽车工业材料轻量化向更高层次发展。


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    Title :

    Light-weight automobile top cover rear cross beam lower plate, preparation method and rear cross beam assembly


    Additional title:

    一种轻量化汽车顶盖后横梁下板、制备方法和后横梁总成


    Contributors:
    CAO DONGJIE (author) / WANG QIANG (author) / XU YUZHI (author)

    Publication date :

    2021-11-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    C22C Legierungen , ALLOYS / B22D CASTING OF METALS , Gießen von Metallen / B23P Sonstige Metallbearbeitung , OTHER WORKING OF METAL / B62D MOTOR VEHICLES , Motorfahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS



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