管表面有极大的硬度(60钢筋混凝土。)，良好的耐磨性和耐腐蚀性，低摩擦系数。
The tube surface has extreme hardness (60 RC.), excellent wear and corrosion resistance, and low coefficient of friction.
透明管和泵体的材料一致，硬度相当，具有同样的寿命。
Transparent tube and pump body of material consistent, hardness, have the same life.
通过分析超声波硬度传感器的特点，提出采用超声波硬度传感器技术实现对管件镀层硬度进行现场无损测量的方法。
By analyzing the characteristic of the ultrasonic hardness sensor, a nondestructive testing method that using the ultrasonic hardness sensor technology for pipe coat is put forword.
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