Ngokuvamile, impahla yomshini wokusika ihlukaniswe: 1. I-HSS (I-Speed Speed Steel) ivame ukubizwa ngokuthi insimbi yesivinini esikhulu.Izici: hhayi ukumelana nokushisa okuphezulu kakhulu, ubulukhuni obuphansi, intengo ephansi kanye nokuqina okuhle.Isetshenziswa ngokujwayelekile kuma-drill, ama-milling cutters, ompompi, ama-reamer nokunye ...
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