Nruam casting graphite pwm yog hais txog cov khoom siv graphite siv hauv kev nrum nruam pwm. Cov hlau nruam casting tshuab yog thev naus laus zis tshiab uas hloov ncaj qha hlau molten rau hauv cov khoom los ntawm kev nruam casting pwm. Vim tias nws tsis yauv yob thiab ua cov khoom siv ncaj qha, cov cua sov thib ob ntawm cov hlau raug zam, yog li ntau lub zog tuaj yeem txuag tau.