CBN含量低的材质等级和CBN含量高的相比更脆，但它们用于淬硬黑色金属加工更好。
CBN content of the material of low grade and high content of CBN compared more crisp, but they are used in hardened ferrous metal processing better.
CBN含量低的材质等级和CBN含量高的相比更脆，但它们用于淬硬黑色金属加工更好。
CBN content of the material of low grade and high content of CBN compared more crisp, but they are used in hardened ferrous metal processing better.
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