Nyob rau hauv cov txheej txheem tsim niaj hnub ntawm cov ntaub qhwv hlau manhole npog, peb tuaj yeem tsim cov hlau ductile los ntawm cam khwb cia hlau thiab forged steel, uas yog dav siv hauv kev lag luam kev lag luam niaj hnub no.Qhov tseeb, lub hauv paus ntsiab lus ntawm ductile hlau yog kom tau txais graphite nrog tib lub zoo li lub pob los ntawm cov txheej txheem ntawm spheroidization, uas zoo txhim kho cov kev ua tau zoo ntawm cam khwb cia hlau, tshwj xeeb tshaj yog nws plasticity thiab toughness, uas ua rau zoo dua carbo ...
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