连铸坯角部纵裂分析及对策

200212December　　2002　　　ResearchonIron&Steel6(129)No.6　(Sum129)胡洵璞()　　,。。　　　　ANALYSISONLONGITUDINALCORNERCRACKSOFCONTINUOUSCASTINGBILLETOFELECTRICARCFURNACEANDITSPRECTAUTIONMEASURESHuXunpu(HunanMetallurgicalpolytechnicCollege)Synopsis　Thispaperanalyzesthereasonsofforminglongitudinalcornercracksforcontinuouscastingbilletofelectricarcfurnaceandputsforwardcorrespondingprecautionmeasures.Strength-eningcontrolsofmaterialqualityandcontinuouscastingprocessplayedanimportantroleinpreven-tingtheformationoflongitudinalcornercracks.Keywords　continuouscastingbillet　longitudinalcornercrack　precautionmeasures:,,(412000)1　　,,,,,,。。19982000,1901.10t,18.83%。,。,。2　32.1　1。1,。,、、、。1　1998～2000t123456789101112199868.9200029.5019.553.2000042.84299.231999106.617.7509.34100.7676.214.8041.8028.4012.621.552.0720003.6025.8040.4713.6334.13451.0805.405.4008.2011.30　179.1243.5540.4722.97164.39546.848.0047.233.812.6239.54362.6%9.422.292.131.218.6528.760.422.481.780.6623.1219.072.2　2。2,。150mm×150mm·4·1784.88t,93.89%;130mm×130mm116.22t,6.11%。2　tmm×mm199819992000%150×150805.19400.98579.111784.8893.89130×13045.0551.2719.9116.226.11　　850.24451.85599.011901.101002.3　3。3,。20MnSi(16Mn,M20Mn(G))1202.06t,63.23%,40Cr45269.02t207.14t,14.15%10.89%。3　1998～2000t199819992000　%20MnSi(16Mn,M20Mn(G))746.79332.04122.931202.0663.23Bs4603.83.80.20ML3513.0013.000.6835(35)29.5042.2571.753.7745(45)60.3557.5889.21207.1410.8950(50)26.9026.901.415510.402.613.000.6840Cr269.62269.0214.1540Mn17.6418.5036.141.902033.5033.501.76M30Mn23.28.8912.0900.6427SiMn1.901.900.10Q235(Q215)10.8010.800.573　,。,,40～50mm,3～4mm,2～3mm,。,,1～3mm,,,。,2mm。4　,150mm×150mm,,,,,,。1,,。1,2～3mm,,,,,,,,,,,,,。1　,,,,,。,,,,,,。,,。。·5·5　,。5.1　SMnS,wSMnS,23。2　[S]3　MnS,[S]0.015%,,MnS30,,Mn,[S],0.015%,MnS30,。5.2　,,。,,,;。,,。,199811、1219993835.67t,70%。、,,。。:;。,,。,,1999,,,199823.97%199912.70%,400.95t。20006,80180,451.08t,,,。5.3　30mm,、。,。。Ogibayashi:,,10mm,。,,。,,,。,,20mm。0.63kgt,20MnSi,,0.49kgt,78%,12mm。20MnSi,,。5.4　5.4.1　,,,,,,,。,1610℃,1620℃,,·6·1590℃,1600℃,1580℃,,45℃,。,。5.4.2　,,,,,。,。,“”,,,,。,,。5.4.3　,,。,,。,。(4)。,,21℃,。4　,、,。。,0.0625～0.1875m3min。。20MnSiwC,。20007～2001341.4t,19997～20003169.66t。6　　,,。,,。(1),[S],。(2),,。(3)、、。(4),。(5),。(6),。1　..:,19942　..:,19803　..:,19904　.500.:,19945　5T.J.H.Billany,A.S.Normanton,K.C.MillsandP.Grieveson.Iron-makingandSteelmaking,1991,18(6):4036　S.OGIBAYASHI,K.YAMAGUCHI,I.MUDAI,T.TAKAHASHI,Y.MIMURAandK.KOYAMA.NipponSteelTech.Rep.,1987,34:1～10(:2002-06-25)《》《》20031,38-402,。《钢铁研究》编辑部·7·