Ductile hlau tsis yog ib qho khoom siv xwb tab sis yog ib feem ntawm cov khoom siv uas tuaj yeem tsim kom muaj ntau yam khoom los ntawm kev tswj hwm ntawm microstructure. Lub ntsiab lus txhais cov yam ntxwv ntawm pawg ntawm cov ntaub ntawv no yog cov duab ntawm graphite. Hauv cov hlau nplaum, cov graphite yog nyob rau hauv daim ntawv ntawm nodules es tsis yog flakes li nws yog nyob rau hauv grey hlau. Lub ntsej muag zoo nkauj ntawm cov flakes ntawm graphite tsim cov ntsiab lus kev ntxhov siab nyob rau hauv cov hlau matrix thiab cov duab sib npaug ntawm cov nodules tsawg dua, yog li inhibiting kev tsim cov kab nrib pleb thiab muab cov ductility zoo dua uas muab cov hlau nws lub npe. Qhov tsim ntawm nodules yog ua tiav los ntawm kev sib ntxiv ntawm cov ntsiab lus nodulizing, feem ntau yog magnesium (nco ntsoov magnesium boils ntawm 1100 ° C thiab hlau melts ntawm 1500 ° C) thiab, tsis tshua muaj tam sim no, cerium (feem ntau nyob rau hauv daim ntawv ntawm Mischmetal). Tellurium kuj tau siv. Yttrium, feem ntau yog ib feem ntawm Misch hlau, kuj tau kawm raws li qhov ua tau nodulizer.
