According to the results of analysis on performance of present mold powder FRK-2 and FRK-49 at steel works
based on mold powder FRK-2 (/% : 32. 68SiO
2
24.42CaO
3. 30MgO
9. 52Al
2
O
3
5.40Na
2
O
3. 10Fe
2
O
3
3. 59F
-
12. 60C) a mold powder for casting 150 mm x 150 mm billet of free cutting steel X1215 (/% : 0. 06 ~0. 09C
≤ 0. 10Si
1. 20 ~ 1. 50Mn
0. 08 ~0. 10P
0. 30 ~0. 50S) with higher basicity
nice holding effect
lower viscosity and definite reducing capacity to decrease S and 0 content in liquid at meniscus and avoiding slag entrapment has been developed. Production results show that the performance of mold powder meets the requirement for production of low carbon and high sulfur fre
e cutting steel X1215; the segregation index of alloy elements in steel is 0. 90 ~ 1. 10
the segregation index of S and Mn is respectively 0. 95 - 1. 05 and 0. 98 - 1. 03 ; and the billet has nice internal quality.
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