The production process of steel 32Cr3MolV round bloom(/%:0.33~0.36C
0.20~0.50Mn
0.20~0.40Si
3.00~3.20Cr
0.30~0.45Ni
1.00~1.20Mo
0.19~0.22V
≤0.008P
≤0.005S
≤0.10Cu
≤0.01 Al)is 110 t EAF-LF-VD-Φ700mm round bloom CC. With control of EAF end [C
]
≥0.08%、[P
]
≤0.004%
LF end slag/% : 50~60CaO
10~15SiO
2
15 -25A1
2
O
3
≤6MgO
ΣFeO+MnO≤0.8%
after VD [H
]
≤1.3 x 10
-6
bloom whole CC process shield casting
casting speed 0.2 m/min
superheating temperature controlled in 18 〜30℃
using M-EMS
S-EMS
F-EMS etc technological measures
the Φ700 mm CC round bloom of 32Ci3Mo1V has been successfully produced. The results show that the surface quality of round bloom is fine with rating of center po
rosity 1.0
centerline shrinkage ≤1.5
centerline crack≤ l. 5
and center defect size less than 100mm all to meet the requirements of standard.