在一定磨损条件下，中硬度钢比高硬度钢耐磨。

Under certain wear condition the wear resistance of 45 steel with medium hardness is higher than that with high hardness.

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研究了一些高、中硬度耐磨焊条的抗裂情况，为耐磨堆焊的设计和研究，提供了一定的参考依据。

In the end we enumerate the studied cases of crack resistance of some high and medium hardness abrasion electrodes, which provides reference for the design and research of abrasion heap soldering.

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复合变质处理使该合金中硅相细化，使布氏硬度提高50%，硬度可达 HB84.9。

The hardness of the alloys which is modified is advanced by about 50%, appropinquity HB84.9.

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