Muaj ntau hom khoom siv hlau, thiab cov hlau feem ntau muab faib ua ob pawg: cov hlau dub thiab cov hlau tsis muaj hlau.
Cov hlau dub
Hais txog hlau, manganese, chromium thiab lawv cov alloys, xws li npua hlau, ferroalloys, cam khwb cia hlau, hlau, hlau manganese, hlau chromium, thiab lwm yam.
Nonferrous hlau
Cov hlau thiab cov hlau tsis yog hlau dub, xws li tooj liab, txhuas, tin, txhuas, zinc, nrog rau tooj dag, tooj liab, dawb tooj liab, aluminium alloys, thiab bearing alloys. Tsis tas li ntawd, npib tsib xee, molybdenum, cobalt, vanadium, tungsten, titanium thiab lwm yam hlau alloys kuj siv nyob rau hauv kev lag luam los txhim kho cov khoom hlau, cov tungsten thiab cobalt feem ntau yog siv rau hauv kev tsim cov hlau alloys. Cov hlau tsis-ferrous tau hais saum toj no tau dhau los ua cov hlau ua lag luam kom paub qhov txawv ntawm cov hlau tsis tshua muaj nqi thiab tsis tshua muaj.
Peb kev lag luam feem ntau muaghlau dubcov khoom,aluminiumcov khoom siv alloy,tooj liabcov khoom, thiabtitaniumcov khoom.
