Cov chaw tsim khoom tsim cov hniav rau lub tshuab txiav nyom rotary hauv ntau.

Cov khoom siv hlau manganese: Cov khoom tseem ceeb yog forged los ntawm cov hlau manganese uas muaj zog heev, nrog rau qhov nyuaj tshaj 60 °. Lawv muaj kev tiv thaiv kev hnav thiab kev cuam tshuam zoo heev. Tom qab kev kho mob quenching, cov ntug txiav yuav ntse dua thiab ruaj khov dua.

Cov yam ntxwv ntawm cov khoom thiab cov txiaj ntsig
Siv tau ntev dua li cov riam txiav ib txwm muaj
Kev ua haujlwm siab thiab ruaj khov zoo
Haum rau cov nyom qhuav
Qhov dav ntawm kev plowing uas hloov kho tau
Kev ua haujlwm muaj kev nyab xeeb siab, nrog rau kev tiv thaiv npog