Cov khoom tseem ceeb ntawm cov kav hlau kav yog carbon, silicon, manganese, sulfur, phosphorus thiab magnesium. Kev siv tus qauv GB/T13295-2003 ISO2531/2003
Cov yeeb nkab hlau txhais lus: Cov kav dej ua los ntawm kev kub ceev centrifugal casting ntawm cam khwb cia hlau saum toj no 18 tom qab ntxiv tus neeg sawv cev spheroidizing los ntawm centrifugal ductile hlau casting tshuab yog hu ua ductile hlau kav (Ductile Cast Iron Pipes), hu ua ductile pipes, ductile hlau. cov kav dej thiab cov kav dej ductile cam khwb cia, thiab lwm yam.
Ductile iron pipes are a type of cast iron pipes. The quality requirement of cast iron pipes is to control the spheroidization level of cast iron pipes to level 1-3 (spheroidization rate>80%), yog li cov khoom siv kho tshuab ntawm cov khoom nws tus kheej tau zoo tuaj, nrog rau cov ntsiab lus ntawm cov hlau thiab kev ua haujlwm ntawm cov hlau. Lub metallographic qauv ntawm cov yeeb nkab hlau tom qab annealing yog ferrite ntxiv rau me me ntawm pearlite, nrog cov khoom siv zoo, kev ua haujlwm zoo tiv thaiv corrosion, zoo ductility, zoo sealing nyhuv, yooj yim installation, thiab tsuas yog siv rau dej, kis tau tus mob, thiab roj kis tau tus mob hauv nroog thiab kev lag luam thiab mining lag luam.
Ib qho nyiaj ntawm spheroidal graphite yog faib rau ntawm ferrite thiab pearlite matrix. Raws li lub nominal txoj kab uas hla thiab qhov yuav tsum tau rau elongation, qhov kev faib ua feem ntawm ferrite thiab pearlite nyob rau hauv lub matrix qauv yog txawv. Qhov feem ntawm pearlite nyob rau hauv me me txoj kab uas hla yog feem ntau tsis ntau tshaj 20%, thiab hais tias nyob rau hauv loj txoj kab uas hla yog feem ntau tswj ntawm txog 25%.
Hlau Yeeb Nkab
