Page 22 - Steel Tech India eMagazine Volume April 2024
P. 22

92/     Ć ,668(   Ć 2FWREHU

             VXUIDFH  $OWHUQDWLYHO\  SULPDU\ 5,6 GHIHFWV FDQ DOVR   H   7KH  IROORZLQJ  PHDVXUHV  DUH  SURSRVHG  IRU  WKH
             DSSHDU RQ WKH VXUIDFH RI D VODE WKDW KDV EHHQ NHSW   DOOHYLDWLRQ RI SULPDU\ UROOHG LQ VFDOH  5,6  VXUIDFH
             LQ WKH UHKHDWLQJ IXUQDFH IRU DQ H[WHQGHG SHULRG RI   GHIHFWV
             WLPH  7KH UHVXOWDQW KHDY\ SULPDU\ VFDOH LV VWXEERUQ   L    (VWDEOLVK IXUQDFH SUDFWLFHV WR SURGXFH D VFDOH
             DQG RIWHQ GLႈFXOW WR EUHDN DQG GLVORGJH LQ SULPDU\     WKDW WHQGV WR EUHDNXS LQWR VKHHWV DW WKH YHUWLFDO
             GHVFDOHU RU GXULQJ WKH URXJKLQJ SDVVHV  7KH UROOHG     HGJHU DQG SULPDU\ GHVFDOHU
             LQ VFDOH IRUPHG LQ WKLV PDQQHU DSSHDUV DV D MDJJHG
                                                                ii.  Establish   width   control   practice   that
             WHDUGURS   RU  D  JURXS  RI  MDJJHG  WHDUGURSV  RQ  WKH
                                                                    QHFHVVLWDWHV  VXႈFLHQW  HGJH  ZRUNLQJ  WR
             ¿QLVKHG KRW UROOHG VWULS  6LQFH WKH VFDOH SDUWLFOHV
                                                                    IUDFWXUH WKH HQWLUH VFDOH VWHHO LQWHUIDFH ERQG
             DUH  HPEHGGHG  LQ  WKH  LQLWLDO  VWDJHV  RI  UROOLQJ
             SURFHVV  WKH GLVWDQFH EHWZHHQ SDUWLFOHV RQ WKH ¿QDO   LLL   $GRSW GHVFDOLQJ LQ IURQW RI ERWK WKH ¿UVW DQG
             steel strip can be quite extended. During the rolling   VHFRQG URXJKLQJ PLOO SDVVHV  LI SRVVLEOH
             operation, the scale particles can be seen on the   iv.  Maintain  an  excess  air  practice  in  the
             WRS VXUIDFH RI WKH UROOHG SURGXFW DV EODFN HORQJDWHG   UHKHDWLQJ IXUQDFH VR DV WR SURGXFH D SRURXV
             WHDUGURSV ZLWK URXQGHG Rႇ FRUQHUV DQG VPRRWKHG         and loose scale that can be easily dislodged.
             HGJHV   ,Q  WKH  SLFNOHG  VWULS   WKH  DႇHFWHG  SRUWLRQV   $Q  R[LGL]LQJ  DWPRVSKHUH  LV  UHFRPPHQGHG
             PD\ DSSHDU DV EODFN RU IURVW\ DUHDV  ZKLFK  DIWHU      WR HOLPLQDWH IRUPDWLRQ RI VWLFN\ RU GLႈFXOW WR
             FROG UROOLQJ  PD\ HQG XS DV KROHV  URXJK VXUIDFH  RU   UHPRYH  R[LGH  VFDOH  RQ  VODEV  E\  LQFUHDVLQJ
             IURVW\ SDWWHUQ .                                       RU  UHJXODWLQJ  WKH  DLU IXHO  UDWLR   DLU JDV  UDWLR
                        > @
             $QRWKHU  UHSRUWHG  FDXVH  RI  SULPDU\  5,6  VXUIDFH    WR  HQVXUH  DW  OHDVW      H[FHVV  R[\JHQ  LQ  WKH
             GHIHFWV LQ KRW VWULS LV WKH RFFXUUHQFH RI VR FDOOHG    IXUQDFH DWPRVSKHUH >   @ .
             ³IXUQDFH VFDOH´ ZLWK D YHU\ VWURQJ LQWHUIDFLDO ERQG   Y    &OHDQ Rႇ DOO ORRVH VFDOHV SULRU WR FKDUJLQJ WKH
             between the scale and steel. It is usually a result    VODE LQWR WKH UHKHDWLQJ IXUQDFH
             RI  RYHUKHDWLQJ  WKH  VODE   HVSHFLDOO\  LQ  WKH  VRDN
                                                                YL   )LUH WKH ERWWRP ]RQHV RI WKH IXUQDFH DW D ORZHU
             ]RQH  7KH VODE VXUIDFH WHPSHUDWXUH EHFRPHV VR
                                                                    WHPSHUDWXUH WKDQ WKH WRS ]RQHV
             KLJK  WKDW WKH VFDOH IXVHV EDFN LQWR WKH VODE  7KLV
             PHOWLQJ  SURFHVV  FUHDWHV  D  PHWDOOXUJLFDO  ERQG  DW   YLL   6HW WKH EXUQHUV WR SURGXFH ORQJ VRIW ÀDPHV
             WKH  VFDOH VWHHO  LQWHUIDFH  $  UHGXFLQJ  DWPRVSKHUH   UDWKHU WKDQ VKRUW KRW ÀDPHV
             LQ WKH IXUQDFH HQKDQFHV WKH SURFHVV  $Q LPSRUWDQW   YLLL   $YRLG RYHUKHDWLQJ DQG ORQJHU UHVLGHQFH WLPHV
             FRQVWLWXHQW RI WKH IXUQDFH JDVHV LV VXOSKXU GLR[LGH    RI VODEV LQ UHKHDWLQJ IXUQDFH
              62     2Q  FKHPLFDO  UHDFWLRQ  ZLWK  VWHHO   LW  IRUPV
                2                                               L[   &KHFN  GHVFDOLQJ  HTXLSPHQW  SHULRGLFDOO\  IRU
             PROWHQ  OLTXLG  VXOSKLGHV  VXFK  DV  )H6   PHOWLQJ     QR]]OH FORJJLQJ  ZHDU  RYHUODSSLQJ RI VSUD\V
             SRLQW       &  LQ VFDOH  7KLV HQKDQFHV WKH VFDOLQJ     DQG LPSLQJHPHQW SUHVVXUH  ,W LV UHFRPPHQGHG
                      o
             SURFHVV  7KH IRUPDWLRQ RI VXOSKLGHV DOVR UHVXOWV LQ    WKDW  LPSLQJHPHQW  SUHVVXUHV  IRU  SULPDU\
             DQ LQFUHDVH LQ VWHHO VFDOH DGKHVLRQ  ZKLFK OHDGV WR    GHVFDOHU  QR]]OHV  EH  UHJXODWHG  EHWZHHQ
             GLႈFXOW\ LQ VFDOH UHPRYDO  ,Q UHGXFLQJ DWPRVSKHUH      03D IRU HႇHFWLYH GHVFDOLQJ WR UHPRYH R[LGH
             WKH VXOSKLGH SKDVH IRUPV DQG JURZV YHU\ UDSLGO\  .     scales >   @ .
                                                       > @
             5ROOHG LQ  SULPDU\  VFDOH  VWUHDNV  LQ  WKH  UROOLQJ        5()(5(1&(6
             direction  are  also  reported  to  occur  owing  to
                                                                6XUIDFH 'HIHFWV LQ +RW 5ROOHG )ODW 6WHHO 3URGXFWV
             GH¿FLHQFLHV  LQ  K\GUDXOLF  GHVFDOLQJ  HTXLSPHQW
                                                                (G   9HUHLQ  'HXWVFKHU  (LVHQKWWHQOHXWH   9'(K
             6FDOH VWUHDNV RQ VWHHO VODE VXUIDFH FDQ EH FDXVHG
                                                                 QG  (GQ    9HUODJ  6WDKOHLVHQ  *PE+   'VVHOGRUI
             E\ SOXJJHG  ZRUQ RXW RU OHDNLQJ GHVFDOLQJ QR]]OHV

             RU  LQVXႈFLHQW  RYHUODS  EHWZHHQ  WKH  VSUD\V   7KH\
             FDQ DOVR EH FDXVHG E\ ERXQFLQJ HႇHFW RI WKH VWULS       :/ 5REHUWV  &ROG 5ROOLQJ RI 6WHHO  0DUFHO 'HNNHU
             under the descaling sprays .                       ,QF   1HZ <RUN DQG %DVHO        SS
                                    > @

                                                                                               STEEL TECH
   17   18   19   20   21   22   23   24   25   26   27