Cov hlau ductile zoo tagnrho rau cov khoom siv valve, vim nws muaj ntau yam zoo. Ua ib qho hloov pauv rau hlau, cov hlau ductile tau tsim nyob rau xyoo 1949. Cov pa roj carbon ntawm cov hlau cam khwb cia yog tsawg dua 0.3%, thaum cov hlau cam khwb cia thiab cov hlau ductile yog tsawg kawg 3%. Cov pa roj carbon tsawg ntawm cov hlau cam khwb cia ua rau cov pa roj carbon uas muaj nyob ua cov graphite dawb tsis tsim cov flakes. Cov pa roj carbon ntuj hauv cov hlau cam khwb cia yog cov graphite dawb flakes. Hauv cov hlau ductile, graphite yog nyob rau hauv daim ntawv ntawm cov nodules es tsis yog flakes zoo li hauv cov hlau cam khwb cia. Piv nrog cov hlau cam khwb cia thiab cov hlau cam khwb cia, cov hlau ductile muaj cov khoom zoo dua. Nws yog cov nodules puag ncig uas tiv thaiv kev tsim cov kab nrib pleb, yog li muab cov ductility zoo dua uas muab cov hlau nws lub npe. Txawm li cas los xij, cov flake hauv cov hlau cam khwb cia ua rau tsis muaj ductility ntawm cov hlau. Qhov zoo tshaj plaws ductility tuaj yeem tau txais los ntawm ferrite matrix.

Piv nrog cov hlau cam khwb cia, cov hlau ductile muaj qhov zoo tshaj plaws hauv lub zog. Lub zog tensile ntawm cov hlau ductile yog 60k, thaum cov hlau cam khwb cia tsuas yog 31k. Lub zog yield ntawm cov hlau ductile yog 40k, tab sis cov hlau cam khwb cia tsis qhia lub zog yield thiab thaum kawg yuav tawg.

Lub zog ntawm cov hlau ductile zoo ib yam li cov hlau cam khwb cia. Cov hlau ductile muaj lub zog tso zis siab dua. Lub zog tso zis qis tshaj plaws ntawm cov hlau ductile yog 40k, thaum lub zog tso zis ntawm cov hlau cam khwb cia tsuas yog 36k xwb. Hauv feem ntau ntawm cov ntawv thov hauv nroog, xws li dej, dej ntsev, pa dej, qhov kev tiv thaiv corrosion thiab oxidation tsis kam ntawm cov hlau ductile zoo dua li cov hlau cam khwb cia. Cov hlau ductile kuj tseem hu ua spheroidal graphite hlau. Vim yog lub spheroidal graphite microstructure, cov hlau ductile zoo dua li cov hlau cam khwb cia hauv kev co, yog li nws zoo dua rau kev txo kev ntxhov siab. Ib qho laj thawj tseem ceeb rau kev xaiv cov hlau ductile ua cov khoom siv valve yog tias nws tus nqi qis dua li cov hlau cam khwb cia. Tus nqi qis ntawm cov hlau ductile ua rau cov khoom siv no nrov dua. Dhau li ntawm qhov ntawd, kev xaiv cov hlau ductile tuaj yeem txo cov nqi machining.