Amapayipi ensimbi eyi-nodular cast iron empeleni angamapayipi e-iron ductile, anomongo wensimbi kanye nezakhiwo zensimbi, yingakho igama lawo. I-graphite emapayipini e-iron ductile ikhona ngendlela eyindilinga, enosayizi ojwayelekile wamamaki ayi-6-7. Ngokwekhwalithi, izinga le-spheroidization lamapayipi ensimbi ensimbi liyadingeka ukuthi lilawulwe emazingeni angu-1-3, ngezinga le-spheroidization lika-≥ 80%. Ngakho-ke, izakhiwo zemishini yezinto ngokwazo zithuthukisiwe, eziphethe ingqikithi yensimbi kanye nezakhiwo zensimbi. Ngemuva kokufakwa kwe-annealing, i-microstructure yamapayipi e-iron ductile i-ferrite enenani elincane le-pearlite, enezici ezinhle zemishini, ngakho-ke ibizwa nangokuthi amapayipi ensimbi yensimbi.