abrasion hardness

By Make experiment of plunger case surface abrasion hardness, in the last, adopt high strength engineering plastic to act as anti-abrasive material, make the success, get great result.

通过对柱塞的表面耐磨层进行各种试验，最后采用了高强度工程塑料进行压注试验，取得了成功，效果显著。

Gray spot; the toughness matching between base metal and weld; lamination and seperation of steel and abrasion hardness, etc.

内容包括焊缝沟腐蚀问题、灰斑问题、母材与焊缝的韧性匹配问题，钢材分层及断口分离问题以及硬度偏低引起的耐磨性问题等。

Ceramics tile are widely used because they have many good characteristics sue has heat-resistance, abrasion hardness, wear-resistance, acid-proof, low-expansion and low-price.

陶瓷玻化砖具有耐高温、高硬度、耐磨损、耐腐蚀、低膨胀系数、价格便宜等特点，因而其用途非常广泛。