Tus naj npawb ntawm cov siv lead ua nuclei raug txo thaum lub eutectic crystallization ntawm cam khwb cia hlau yog melted nyob rau hauv lub induction melting rauv.

Hauv cupola smelting, lub sij hawm los ntawm melting ntawm tus nqi mus rau lub outflow ntawm molten hlau los ntawm lub cub tawg yog luv heev, txog 10 feeb. Thaum smelting hauv ib induction melting rauv, nws yuav siv sij hawm tsawg kawg yog 1 teev los ntawm qhov pib ntawm tus nqi mus rau tapping hlau, thiab nws kuj muaj qhov tshwj xeeb stirring nyhuv ntawm induction cua sov, uas zoo heev txo cov khoom nyob rau hauv lub molten hlau uas yuav siv tau raws li txawv teb chaws nucleus ntawm graphite. Thaum lub sij hawm eutectic crystallization. . Piv txwv li, SiO2, uas tuaj yeem siv los ua cov siv lead ua txawv teb chaws, tuaj yeem ua rau cov pa roj carbon monoxide hauv cam khwb cia hlau yooj yim thiab ploj mus thaum kub siab heev thiab muaj cov nyhuv nplawm:

SiO2＋O2 → Si＋2CO↑

Yog li ntawd, thaum smelting grey cam khwb cia hlau nyob rau hauv ib tug induction melting rauv, tshwj xeeb mloog yuav tsum tau them rau cov kev kho mob inoculation. Tus nqi ntawm inoculant yuav tsum yog me ntsis ntau tshaj li qhov hauv cupola smelting. Nws yog qhov zoo tshaj plaws los ua pre-incubation (pre-inoculation) nyob rau hauv lub cub tawg ua ntej tso tawm. Txhawm rau txhim kho cov xwm txheej nucleation ntawm cam khwb cia hlau eutectic crystallization.