Tus nqi ntawm qhov kev ua zoo tshaj plaws tiv thaiv steel ntawv?
Cov qeb kawm ib txwm muaj ntawm arch Hlau Phaj
AR400- Kev tshem tawm nruab nrab ua tsis kam, haum rau kev hnav cov ntaub ntawv khaws cia .
AR450- Ntau dua hardness dua li ntawm AR400, siv nyob rau hauv ntau qhov kev mob hnyav .
AR500- nyuaj heev, zoo tagnrho rau kev hnyav-kev cuam tshuam thiab kev puas siab-Abrary ib puag ncig.
AR600- Qhov nyuaj tshaj plaws kev lag luam muaj ar steel, siv nyob rau hauv huab zoov tej mob (e {{} g}, mining khoom).
