C72900 yog cu15ni8Sn raws li tooj liab-raws li kev ua kom zoo nkauj-muaj zog ntawm kev ua tau zoo.
* Ua tiav kev sib xyaw ua ke ntawm qhov siab thiab siab zog. Muaj peev xwm tiv taus kev cuam tshuam zoo ntawm kev cuam tshuam. Tuaj yeem ua tau raws li cov kev xav tau feem ntau ntawm cov kev tsim hluav taws xob zoo li qub thiab lub siab.
* Kev ua tau zoo heev ntawm kev tawm tsam cov kabmob, nrog cov khoom siv uas tseem ceeb rau kev sib txhuam ntawm cov dav hlau loj, thiab kuj yog qhov kev sib txhuam uas nyiam tshaj plaws ntawm cov roj sib txuas sib txuas
* Tsim nyog rau txhua hom ntawm cov acidic ib puag ncig lossis ntsev dej, kub corrosion tsis kam.

Nyob rau hauv kev lag luam roj, cunisn alloy kuj tseem tuaj yeem siv rau hauv cov roj tsheb hydraulic, Coupling ntawm sucker pas dej ntawm cov roj ua haujlwm, LWD), bearing bush thiab tshuab ntxhua khaub ncaws