Continuously casting high density Hollow Profiles of Cast Iron
1、 Material：
Ductile iron: QT400-15; QT450-112; QT500-7; QT500-10; QT600-2
Gray iron: HT250; HT300; HT350
alloy cast-iron: CrNiMo,CrMoCu,NB，（VNb），B，P.etc
2、 specifications：
d=the range of external diameter (mm) r=the range of the wall thickness (mm)
d（mm） 60-80 80-100 100-130 130-160 160-200 200-260
r（mm） 6-8 6-11 7-15 8-25 8-30 8-35

specifications：
d=the range of external diameter (mm) r=the range of the wall thickness (mm)
d（mm） 60-80 80-100 100-130 130-160 160-200 200-260
r（mm） 6-8 6-11 7-15 8-25 8-30 8-35