Hmoov metallurgy originated nyob rau hauv ntau tshaj 3000 BC. Thawj txoj kev ua hlau yog tseem ceeb hmoov metallurgy.
1) muaj ib txwm pores nyob rau hauv cov khoom;
2) lub zog ntawm cov hmoov metallurgy zoo tib yam yog qis dua li cov khoom sib txuam los yog castings (li 20% ~ 30% qis);
3) Vim tias qhov fluidity ntawm cov hmoov hauv cov txheej txheem tsim yog tsawg dua li cov kua hlau, cov qauv thiab cov duab ntawm cov khoom raug txwv rau qee yam;
4) lub siab xav tau rau kev tsim yog siab, yog li cov khoom raug txwv los ntawm lub peev xwm ntawm cov cuab yeej nias;
5) tus nqi siab ntawm nias tuag, feem ntau tsuas yog siv rau batch lossis ntau lawm.
Cov hmoov hlau: qhov zoo ntawm cov khoom kawg yog qhov nyuaj rau kev tswj hwm dawb; Cov hmoov hlau yog kim; hmoov tsis ua raws li txoj cai ntawm hydraulics, kom cov qauv ntawm cov khoom tsim muaj qee qhov kev txwv.