MP (Mechanical polishing): feem ntau yog siv rau oxidation txheej, qhov, thiab khawb ntawm cov kav hlau. Nws brightness thiab nyhuv nyob ntawm seb hom kev ua. Tsis tas li ntawd, mechanical polishing, txawm tias zoo nkauj, tuaj yeem txo qhov kev tiv thaiv corrosion. Yog li ntawd, thaum siv nyob rau hauv corrosive ib puag ncig, kev kho mob passivation yog yuav tsum tau. Ntxiv mus, muaj feem ntau polishing cov khoom seem ntawm cov kav dej steel.