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    • 5. 发明授权
    • Production process for producing hollow steel tube of high strength
    • 生产高强度空心钢管的生产工艺
    • US5405459A
    • 1995-04-11
    • US137363
    • 1993-10-18
    • Noritaka MiyamotoMasazumi Onishi
    • Noritaka MiyamotoMasazumi Onishi
    • C21D7/04C21D7/06C21D8/10C21D9/08
    • C21D8/10C21D9/08C21D2261/00C21D7/04C21D7/06
    • A production process for producing a hollow steel tube of a high strength includes the steps of a tube preparation step of producing a seamless steel tube of a heavy thickness containing flaws of less than 0.25 mm in depth in an inner periphery thereof, a tube inner periphery correction step of correcting at least the flaws having a width of 0.001 mm or less so as to have a depth of 0.15 mm or less, and a hardening step of hardening the seamless steel tube across a whole thickness thereof to a hardness of from 450 to 670 in Vickers hardness (Hv). The production process enables not only to produce a hollow steel tube of a high strength at a less production cost but also to adapt it to exhibit such a high torsional fatigue fracture resistance and a high impact strength that it is applicable to axles for large size automobiles producing high outputs.
    • 制造高强度中空钢管的制造方法包括以下步骤:制造在内周具有深度小于0.25mm的瑕疵的重层厚度的无缝钢管,管内周 至少将宽度为0.001mm以下的缺陷修正为0.15mm以下的深度的修正步骤,以及将无缝钢管整体厚度硬化至硬度为450〜450mm的硬化工序, 670维氏硬度(Hv)。 该制造方法不仅能够以较低的生产成本生产高强度的中空钢管,而且能够适应于具有如此高的抗扭转疲劳抗断裂性和高冲击强度,适用于大型汽车的车轴 产出高产量。