OCR Text |
Show ...... c ...e... . -c tV ~ ." C 0 U C) ~ tV ~ o ... 0.3 O. 2 O. I 0 100 ......... 0 0 '-'" Q.) .-CIl ~ Q.) ~ :J c'd ~ Q.) 0. E Q.) Q.) Q.) .-- (I) c: Q.) 0 ::.E 70 60 50 40 30 20 10 • Results ach i eved by MFB Lance gap : 2 m O2 : 1. 500 Nm'/h s tee I : If s t ee I • • • Efficiency of rehea t i ng 93~ • o ~----~----~------~----~ o 0. 5 1.0 1.5 2. 0 Unit Al consumption for reheating (kg/t) Fig.16 Relation between consumption of Al and temperature rise of molten steel .-... 4 0 .--------------------=----. ~ '-"': 3 5 ~ 30 ::J ~ l;~ ;!~::'",'i"",ol:.l:.j:.: .i'. ... ~==~I-====:..:.-. "~'C .-C"d~ I ~ .:.: ..•.ii. :.,:.:. :'.·..!.!:: ·i!"ili.;".y'II:!ii:ll,·l;:j·: ,·;:'.;!i'l:iii:il:jii::i:li: ~ Effect of aluminum heating (Variable temperature cu... 0 ~_--';"---:""L---....J""" _....,;.. .•..•.. .1- ••••. •:••-•~ . c::::: ~ 4 8 12 16 (II in.> Healing lime by LNG-IOONm'/h ( b 2 ~ ~ 8 1'0 1'2 (MJrr) ) Heat generated by burner during RH treatment con tro I) Fig.17 Total effect on tapping temperature b RH-MFB r---____ 1000 E~~~~~~~ • •• • 0 0 0 • • . T 0 0 o 8 0 0 0 0 • • • •• • 200 300 400 500 ( 0), (ppm) o (Cl c I OOppm • (Cl z: 20pPil ,.... c: ~ 1 00 §~~~~~~~~~~ <.,) o 5 10 15 20 Time (m in) Fig.18 Effect of free oxygen on decarburization rate constant Fig.19 Shift of [C] in steel during RH treatment 1 3 |