One simple way of describing strength is in terms of surface hardness.
描述强度的一种最简单方法是以表面硬度来表示。
Is hardness tested on a surface that has been ground to remove decarburization?
硬度检测是否在去除了氧化皮的表面上进行？
High temperature of roll surface cause burning phenomenon and lower the hardness of roll surface.
辊面高温会产生烧附现象，使辊面的硬度降低。
Suggestion: pump shaft or protective set of surface hardness to achieve 60hrc.
建议：泵轴或防护套的表面硬度要达到60hrc。
Suggestion: pump shaft or protective set of surface hardness to achieve 60hrc.
建议：泵轴或防护套的表面硬度要达到60hrc。
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