Page 19 - Steel Tech India eMagazine Volume April 2024
P. 19
92/ Ć ,668( Ć 2FWREHU
7KH *HQHVLV RI 5ROOHG LQ 3ULPDU\ 6FDOH 6XUIDFH
'HIHFWV RQ +RW 5ROOHG 6WHHO &RLOV
1
S. Srikanth and P Saravanan 2
5 ' &HQWUH IRU ,URQ DQG 6WHHO 6$,/ 5DQFKL ,1',$
6DOHP 6WHHO 3ODQW 6$,/ 6DOHP ,1',$
E\ LWV V\VWHPDWLF EUHDNGRZQ WR D PP WKLFN VWHHO
$EVWUDFW
strip during its passage through hydraulic descalers,
Metallurgical investigations were carried out to probe URXJKLQJ PLOO DQG ¿QLVKLQJ PLOO WUDLQV EHIRUH HYHQWXDO
WKH JHQHVLV RI PDVVLYH UROOHG LQ VFDOH 5,6 VXUIDFH FRLOLQJ 7KH KRW UROOHG VWHHO FRLO KDV D FKDUDFWHULVWLF
GHIHFWV RQ VHYHUDO KRW UROOHG VWHHO FRLOV IURP KRW VWULS
PLOO 7KH VXUIDFH GHIHFWV ZHUH FKDUDFWHUL]HG ERWK E\ JUD\LVK EODFN VXUIDFH ¿QLVK DWWULEXWDEOH WR WKH PLOO
; UD\ GLႇUDFWLRQ ;5' DQG OLJKW RSWLFDO PLFURVFRS\ VFDOH WKDW FRPSOHWHO\ FRYHUV WKH VWHHO VXUIDFH ,Q
/20 %DVHG RQ WKH PLFURVFRSLF DSSHDUDQFH JHQHUDO WKH VXUIDFH TXDOLW\ RI KRW UROOHG VWHHO VWULS KDV
DQG ;5' DQDO\VHV WKH 5,6 VXUIDFH GHIHFWV ZHUH JUHDWO\ LPSURYHG RYHU WKH \HDUV WKURXJK DGRSWLRQ
FRQVWUXHG WR EH SULPDU\ LQ RULJLQ KDYLQJ RULJLQDWHG RI DXWRPDWHG KRW UROOLQJ SUDFWLFHV DQG FORVH FRQWURO
IURP W H KRW VWULS PLOO ZDONLQJ EHDP IXUQDFH DQG RYHU KRW GHIRUPDWLRQ UHJLPHV \HW WKH SURGXFWLRQ RI
UROOHG LQ RQWR WKH VWULS LQ LQLWLDO URXJKLQJ SDVVHV KRW UROOHG FRLOV IUHH IURP JHQHULF GHIHFWV OLNH UROOHG LQ
9DULRXV PHDVXUHV IRU DOOHYLDWLRQ RI SULPDU\ 5,6 VFDOH VOLYHUV VFDEV JRXJHV VFUDWFKHV FUDFNV ODSV
VXUIDFH GHIHFWV LQ KRW UROOHG VWULS DUH SURSRVHG DQG ODPLQDWLRQV FRQWLQXHV WR SRVH D FKDOOHQJLQJ DQG
,1752'8&7,21 XSKLOO WDVN IRU PLOO ZRUNHUV DOO RYHU [1,2] . The elucidation
LQ WKLV SDSHU GHDOV ZLWK WKH LQYHVWLJDWLRQ RI RQH VXFK
In an inteJUDWHG VWHHO LQGXVWU\ WKH TXDOLW\ RI VHPL
W\SLFDO GHIHFW ZLWK D XQLTXH DSSHDUDQFH LQ D KRW UROOHG
¿QLVKHG VWHHO SURGXFWV LV RIWHQ PDUUHG E\ WKH SUHVHQFH
steel strip.
RI VXUIDFH GHIHFWV 6XUIDFH GHIHFWV RQ WKH ZKROH QRW
RQO\ DႇHFW WKH DHVWKHWLF DSSHDUDQFH RI D ¿QLVKHG VWHHO (;3(5,0(17$/
SURGXFW EXW DOVR VHULRXVO\ FRPSURPLVH LWV SHUIRUPDQFH 0HWDOOXUJLFDO LQYHVWLJDWLRQV HPSOR\LQJ ; UD\ GLႇUDFWLRQ
6XUIDFH ÀDZV PD\ DULVH IURP LQDGHTXDFLHV LQ VWHHO ;5' DQG OLJKW RSWLFDO PLFURVFRS\ /20 ZHUH GLUHFWHG
FOHDQOLQHVV DW WKH VWHHO PDNLQJ VWDJH RU PD\ EH to probe the genesis and probable causes leading to
LQGXFHG LQ WKH PDWHULDO GXULQJ GRZQVWUHDP SURFHVVLQJ WKH LQFLGHQFHV RI PDVVLYH UROOHG LQ VFDOH 5,6 VXUIDFH
VWHSV FRPSULVLQJ FRQWLQXRXV FDVWLQJ UHKHDWLQJ DQG GHIHFWV RQ KRW UROOHG VWHHO FRLOV 7KHVH VWHHO FRLOV KDG
hot/ cold rolling [1,2] 0DQ\ VXUIDFH GHIHFWV PD\ UHPDLQ EHHQ SURFHVVHG WKURXJK KRW VWULS PLOO RI DQ LQWHJUDWHG
LQ EHQLJQ REVFXULW\ GXULQJ WKH LQWHUPHGLDWH SURFHVVLQJ VWHHO SODQW DQG VHYHUDO VXFK GHIHFW ULGGHQ FRLO VDPSOHV
VWDJHV DQG PD\ HYHQWXDOO\ VKRZ XS LQ WKH ¿QLVKHG VWHHO KDG EHHQ VXSSOLHG IRU GHIHFW DQDO\VLV
SURGXFW GXULQJ ¿QDO LQVSHFWLRQ OHDGLQJ WR LWV UHMHFWLRQ 0HWDOORJUDSKLF VSHFLPHQV ZHUH VHFWLRQHG IURP KRW
DQG UHOHJDWLRQ DV D GRZQJUDGHG PDWHULDO UROOHG FRLO VDPSOHV GHVLJQDWHG IRU PHWDOOXUJLFDO
,Q D VWHHO PLOO WKH FRQWLQXRXV KRW VWULS UROOLQJ RSHUDWLRQ LQYHVWLJDWLRQ IURP ORFDWLRQV ERWK DW WKH YLFLQLW\ RI
HQWDLOV WKH VRDNLQJ RI PP WKLFN FRQWLQXRXVO\ H[WUDQHRXVO\ LPSODQWHG 5,6 GHIHFWV DQG DZD\ IURP WKH
FDVW VWHHO VODE LQ D UHKHDWLQJ IXUQDFH DW C, GHIHFW UHJLRQV FRYHUHG ZLWK QRUPDO WHUWLDU\ PLOO VFDOH DV
o
IRU FRPSRVLWLRQDO DQG WKHUPDO KRPRJHQL]DWLRQ IROORZHG VKRZQ LQ )LJ 7KH ¿JXUH VKRZV WKH SUHFLVH ORFDWLRQV
STEEL TECH
