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比较了两种加工１２．９级螺 栓的滚丝轮在材料使用、制造工艺方面的 差别，并分析了它们在使用过程中失效的 形式及原因。
The differences between the two kinds of materials used and the manufacturing process of 12.9 bolts are compared. The failure modes and reasons of their use in the process are also analyzed.