Page 39 - Steel Tech India eMagazine Volume October 2021
P. 39
92/ Ć 12 Ć 2FWREHU
Table 4: The nitride capacity (CN) of some slags ZLWK SSP RI 1 JDV DW & DQG
& LQ WKHUPRG\QDPLFV HTXLOLEULXP FRQGLWLRQ 7KH
S. Basicity Optical Temp Nitride HTXLOLEULXP SKDVH IRUPDWLRQ LQ WKH VWHHO LV FDOFXODWHG
0
No (B4) Basicity (/) ( C) capacity (CN)
DIWHU GHQLWULILFDWLRQ RI VWHHO XVLQJ WKH (TXLOLE PRGXOH RI
(
)DFW6DJH DV VKRZQ LQ )LJXUH WKH IORZ GLDJUDP IRU
(
HTXLOLEULXP SKDVH FDOFXODWLRQ 7KH IRUPDWLRQ RI QLWULGH
(
FRPSRQHQWV DIWHU V\QWKHWLF VODJ WUHDWPHQW DW & LV
( VKRZQ LQ 7DEOH IRU QRQ NLOOHG VWHHO
(
)RU DOXPLQLXP NLOOHG VWHHO D VLPLODU SURFHGXUH LV
(
IROORZHG WR FDOFXODWH QLWULGH IRUPDWLRQ DQG RWKHU SKDVHV
(
GXULQJ V\QWKHWLF VODJ WUHDWPHQW IRU GHQLWULILFDWLRQ 7KH
(
VDPH FRQGLWLRQV DV PHQWLRQHG IRU QRQ NLOOHG VWHHO LV
(
VWLPXODWHG ZLWK WKH DGGLWLRQ RI DOXPLQLXP DV GHR[LGLVHU
(
:KHQ VROLGLILHG V\QWKHWLF VODJ LV UHDFWHG ZLWK SSP
WKH IROORZLQJ SKDVHV RI VROLGLILHG V\QWKHWLF VODJ $JDLQ RI 1 JDV DQG DOXPLQLXPIRU NLOOHG VWHHO DW &
WKH FRPSRVLWLRQ RI VROLG V\QWKHWLF VODJ LV UHDFWHG 7KH UHVXOWV ZH REWDLQ IURP )DFW6DJH DUH GLVSOD\HG LQ
7DEOH
Table 5: Theoretical calculation of equilibrium phases for non-killed steel from FactSage 6.4
Components of Phase present in the Wt % of Phases formed after :W ¾QDO VODJ
0
synthetic slag synthetic slag at 25 C phase GHQLWUL¾FDWLRQWUHDWPHQW RI V\QWKHWLF VODJ composition
&D2 &D2 $O 2 6L2 6L&
6L2 &D2 0J2 6L2 &
$O 2 &D2 0J2 $O 2 6L 1
0J2 0J2 6L2 /LT 0L[WXUH RI &D2 6L2 0J2 $O 2
&D& 6L&
)UHH FDUERQ
Table 6: Theoretical calculation of equilibrium phases for Al killed steel from FactSage 6.4
Components of Phase present in the Wt % of 3KDVHV IRUPHG DIWHU GHQLWUL¾FDWLRQ :W ¾QDO VODJ
synthetic slag synthetic slag at 25 C phase treatment of synthetic slag composition
0
&D2 &D2 $O 2 6L2 6L&
6L2 &D2 0J2 6L2 6L OLT
$O 2 &D2 0J2 $O 2 $O1
0J2 0J2 6L2 /LT PL[WXUH RI &D2 6L2 0J2 $O 2
&D& 6L&
&
:H REVHUYHG IURP WKH )DFW6DJH VWXG\ WKDW QLWURJHQ DQG FRQWURO RI QLWURJHQ SLFN XS IURP WKH DWPRVSKHUH
FRQWDLQLQJ HTXLOLEULXP FRPSRXQGV VXFK DV 6L 1 GXULQJ VWHHOPDNLQJ LQ WKH LQGXFWLRQ IXUQDFH 7KHUHIRUH
DQG $O1 DUH IRUPHG LQ WKH VODJ DW VWHHOPDNLQJ RSWLPL]HG V\QWKHWLF VODJ FRPSRVLWLRQ DUH ZW
WHPSHUDWXUH & 7KHVH DUH 6L 1 DQG $O1
6L2 ZW $O 2 ZW &D2 ZW
HTXLOLEULXP SKDVHV +RZHYHU RWKHU QLWULGH FRPSRXQGV
0J2 DQG ZW &D& IRU GHQLWURJHQDWLRQ RI WKH
OLNH &1 PD\ EH IRUPHG GXULQJ WKH DFWXDO WUHDWPHQW RI
VWHHO
V\QWKHWLF VODJ 1LWURJHQ FRXOG EH UHPRYHG IURP PROWHQ
VWHHO WR VODJ :H KDYH RSWLPL]HG WKH V\QWKHWLF VODJ 3.3 Preparation of synthetic slag in induction
VODJ GHVLJQ FRPSRVLWLRQ EDVHG RQ WKHLU EDVLFLW\ % Furnace
YLVFRVLW\ QLWULGH FDSDFLWLHV RSWLFDO EDVLFLW\ DQG OLTXLGXV
7KH V\QWKHWLF VODJ FRPSRVLWLRQV DUH SUHSDUHG LQ
WHPSHUDWXUH RI V\QWKHWLF VODJ HWF GHQLWURJHQDWLRQ
DQ LQGXFWLRQ IXUQDFH XVLQJ JUDSKLWH FUXFLEOH DV
STEEL TECH