Raws li kev hloov pauv rau cov hlau, cov hlau nplaum tau tsim nyob rau xyoo 1949. Cov hlau nrum muaj tsawg dua 0.3 feem pua carbon, thaum cov hlau cam khwb cia thiab cov hlau nplaum muaj tsawg kawg yog 3 feem pua carbon. Cov ntsiab lus tsis tshua muaj carbon nyob rau hauv cam khwb cia hlau yog xws li cov pa roj carbon tam sim no li dawb graphite tsis tsim cov qauv flakes. Lub ntuj daim ntawv ntawm carbon nyob rau hauv cam khwb cia hlau yog nyob rau hauv daim ntawv ntawm dawb graphite flakes. Nyob rau hauv cov hlau ductile, cov graphite flakes no hloov mus rau hauv me me spheres los ntawm kev kho tshwj xeeb. Qhov kev txhim kho no ua rau cov hlau nplaum muaj lub cev zoo dua li cov hlau cam khwb cia thiab hlau. Nws yog qhov no spherical microstructure ntawm carbon uas ua rau cov hlau ductile ntau ductile thiab cuam tshuam resistant, thaum lub flake daim ntawv nyob rau hauv cam khwb cia hlau ua cam khwb cia hlau tsawg ductile. Qhov zoo tshaj plaws ductility yog tau los ntawm ib tug ferritic matrix, yog li ntawd tag nrho cov NIBCO Ductile Hlau siab loaded qhov chaw yog kho nrog ib tug ferritizing annealing voj voog. Cov qauv kheej kheej hauv cov hlau nplaum kuj tseem tuaj yeem tshem tawm qhov tshwm sim tawg uas cov flake graphite hauv cov hlau cam yog yooj yim los tsim. Hauv micrographs ntawm cov hlau nplaum, cov kab nrib pleb tuaj yeem pom tau mus rau cov pob graphite thiab xaus. Hauv kev lag luam hlau ductile, cov graphite nodules hu ua "crack stoppers" vim lawv muaj peev xwm tiv thaiv kev puas tsuaj. Ductile hlau yog qee zaum hu ua "zoo tshaj plaws ntawm ob lub ntiaj teb" hlau, txhais tau hais tias nws muaj lub zog ntawm cov hlau cam khwb cia thiab zoo heev corrosion kuj ntawm cam khwb cia hlau.
Kev sib piv ntawm Cov Hlau Hlau thiab Cam khwb cia hlau (Grey Iron) Piv nrog cov hlau cam khwb cia, cov hlau nplaum muaj qhov txiaj ntsig zoo ntawm lub zog. Lub zog tensile ntawm ductile hlau yog 60k, thaum lub cam khwb cia hlau tsuas yog 31k. Lub zog tawm los ntawm cov hlau nplaum yog 40k thaum cam khwb cia hlau tsis qhia lub zog tawm los thiab nws thiaj li tawg. Lub zog-rau-tus nqi piv ntawm cov hlau nplaum yog qhov zoo tshaj plaws ntawm cov hlau cam khwb cia. (saib nplooj 83 rau kev sib piv zoo ntawm cov khoom siv tshuab). Ductile hlau yog tib yam li cam khwb cia hlau nyob rau hauv cov nqe lus ntawm corrosion kuj.
Ductile Iron vs. Cam khwb cia hlau Lub zog ntawm ductile hlau yog piv rau cov cam khwb cia hlau. Cov hlau ductile muaj lub zog tawm los ntau dua, nrog rau qhov tsawg kawg nkaus lub zog ntawm 40k, thaum cam khwb cia hlau muaj lub zog tawm los tsuas yog 36k. (saib nplooj 83 rau kev sib piv zoo ntawm cov khoom siv tshuab). Hauv cov ntawv thov hauv nroog feem ntau, xws li: dej, dej ntsev, chav dej, thiab lwm yam, qhov kev tiv thaiv corrosion thiab oxidation tsis kam ntawm cov hlau ductile ntau tshaj cov hlau cam khwb cia. Vim lub spherical graphite microstructure ntawm ductile hlau, ductile hlau yog superior rau cam khwb cia hlau nyob rau hauv cov nqe lus ntawm kev co dampening peev xwm, yog li nws yog ntau conducive rau txo kev ntxhov siab. Ib qho laj thawj tseem ceeb rau kev xaiv cov hlau tsis zoo yog cov hlau nplaum yog pheej yig dua li cov hlau cam khwb cia. Tus nqi qis ntawm cov hlau nplaum ua rau cov khoom siv no nrov dua, casting ntau dua, thiab tsawg dua machining tus nqi ntawm cov hlau ductile.
