The grinding burn causes the surface hardness falling off and wear speeding up.

磨削烧伤使表面硬度下降，磨损加剧。

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Diamond CVD coating process is introduced to increase the surface hardness of cutting tools.

为增加切削刀具表面硬度引入了钻石化学蒸发沉淀涂层工艺。

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The laser hardening material can effectively improve the surface hardness and wear resistance.

认为激光硬化处理能够有效地改善材料的表面硬度和耐磨性。

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The screen with 7H surface hardness ensures high durability and touch accuracy, even in high traffic environments.

ENGADGET: ViewSonic outs three Windows 8-certified touchscreen displays

The non-scratch touch surface is made of reinforced glass with a hardness of 5.5 Mohs, to ensure it has the durability to withstand use in schools, hospitals, and public access areas.

ENGADGET: Eizo rolls out 17-inch FlexScan T1751 multitouch monitor

So does the material's hardness, and especially its surface condition.

ECONOMIST: Aircraft fatigue