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    c型钢的开发还存在哪些问题?
    发布来源:http://affordabLe-Louisvuittonbags.com/  2019-5-15 15:50:03 发布人:济南坚固fun88安装
    我国铁路货车上应用C型钢固然已有十多年的历史,但与俄罗斯、美国等国度相比,在种类和数量上都相差很多,在C型钢的制造工艺和产品装车运用上存在以下问题:
    Although the application of C-section steel on railway freight cars in China has a history of more than ten years, compared with other countries such as Russia and the United States, there are many differences in types and quantities. There are the following problems in the manufacturing process of C-section steel and the application of product loading:
    一是C型钢作为废品存在较大的内应力。在C型钢加工前期,开卷、滚剪、闭卷再开卷、平板后停止冷弯,增加了内应力。在冷弯过程中,其加工方式属于机械强迫变形,成形后势必存在很大的内应力。冷弯后固然有校正工序,但也只是对型钢外形尺寸予以准确,抵消除内应力效果并不大。其废品寄存一段时间后时效变形很明显,这阐明C型钢的确有很大的内应力存在。
    First, C-section steel as a waste product has a large internal stress. In the early stage of C-section steel processing, uncoiling, rolling shearing, uncoiling after closing, and stopping cold bending after flat plate increase the internal stress. In the process of cold bending, its processing mode belongs to mechanical forced deformation, and there must be a great deal of internal stress after forming. Although there is a correction procedure after cold bending, it is only accurate for the shape and size of section steel, and the effect of eliminating internal stress is not great. The aging deformation of waste products is obvious after storage for a period of time, which indicates that there is a great internal stress in C-section steel.
    二是装车前的处置使C型钢产生较大变形。由于 C型钢交货状态下是没有预涂底漆的,这就请求装车前要停止抛丸除锈处置。
    Second, the disposal before loading causes large deformation of C-section steel. Since there is no pre-coated primer for C-section steel on delivery, it is required that shot blasting and rust removal be stopped before loading.
    在除锈、钝化了C型钢外表的同时,也将其内应力停止了释放,形成了弯曲和改变变形。对那些启齿不对称构造,变形尤为明显。

    While removing rust and passivating the appearance of C-section steel, the internal stress of C-section steel stops releasing, forming bending and changing deformation. For those asymmetric structures, the deformation is particularly obvious.

    三是固然我国研制的耐候钢力学性能、抗腐蚀性及焊接性良好,但其冲压性能不如普通碳素钢。其制件在弯曲后回弹较大,因而在冷弯时应研讨采用合理的工艺参数,以保证产质量量。
    Third, although weathering steel developed in China has good mechanical properties, corrosion resistance and weldability, its stamping performance is not as good as that of common carbon steel. The springback of the parts is large after bending, so reasonable technological parameters should be discussed and adopted in cold bending to ensure the quality of the products.
    四是应尽快完善新型C型钢的技术条件。铁路货车在应用C型钢时,应针对各种C型钢的加工制造、运用工况、变形特性等制定相应的技术规范,以顺应消费、运用及检验。在现行铁路货车的检验规范上目前还没有针对C型钢的标准。这在一定水平上障碍了C型钢在铁路货车上应用及开发的进程。
    Fourthly, the technical conditions of new type C-section steel should be improved as soon as possible. When applying C-section steel to railway freight cars, corresponding technical specifications should be formulated for the processing, manufacturing, operating conditions and deformation characteristics of various C-section steel in order to conform to consumption, application and inspection. At present, there is no standard for C-section steel in the current inspection specifications for railway freight cars. To a certain extent, this hinders the application and development of C-section steel in railway freight cars.