Lub hardness ntawm tooj dag yog loj dua Aluminium alloys tab sis me dua cam khwb cia hlau thiab cam khwb cia hlau. Yog li nws yog ib qho yooj yim rau lo tej cuab yeej thaum lub sij hawm machining. Feem ntau lub siab hardness alloy steel yuav siv tau raws li cov ntaub ntawv ntawm tej cuab yeej rau tooj dag machining. Casting tooj dag muaj cov khoom siv ntau dua li tooj liab, tab sis tus nqi qis dua bronze. Cam khwb cia tooj dag feem ntau yog siv rau lub hom phiaj dav dav bearing bushings, gears thiab lwm yam hnav-resistant qhov chaw thiab li qub thiab lwm yam corrosion-resistant qhov chaw. Brass muaj zog hnav tsis kam. Brass feem ntau yog siv los ua cov li qub, cov kav dej, txuas cov kav dej rau cov cua txias sab hauv thiab sab nraud, thiab cov radiators.
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