冷镦钢SWRCH35K连铸坯裂纹的控制

SWRCH35K411101SWRCH35K150mm×150mmControlofConcastingBilletCracksofColdUpsetSteelSWRCH35KZhouJinbiaoXiangtanIronandSteelGroupCoLtdXiangtan411101AbstractThecauseofcrackformationof150mm×150mmconcastingbilletofcoldupsetsteelSWRCH35Kpro-ducedatNo2steelmakingworksXiangtanIronandSteelwasanalyzed.Thequalityofconcastingbillethasbeenincreasedobviouslybyimprovingthemouldparametersprocesscontrolandshieldingfluxes.MaterialIndexColdUpsetSteelConcastingBilletCrackControlSWRCH35K8.82000SWRCH35K11.111SWRCH35K/%Table1ChemicalcompositionsofsteelSWRCH35K/%CSiMnPS0.32～0.380.10～0.350.60～0.90≤0.035≤0.0350.33～0.370.15～0.300.65～0.85≤0.030≤0.0301.2SWRCH35K80t90tLF1#150mm×150mm22.120011030SWRCH35K22.222.2.194236Vol.23.No.6200212═════════════════════════════════════════════════════════════SPECIALSTEELDecember20022SWRCH35KTable2MacrostructureofconcastingbilletofsteelSWRCH35K1593110.51.00.51.50.50.51593120.51.01593130.53.04.02.51593141.53.00.51593150.50.51491280.51.03.52.52.01.51491290.51491302.50.50.51491311.50.53.01491320.50.52.51.51491330.51491343.51.02.02.52.2.2CMnSP2.2.32.2.41317.5mm1Fig.1Effectofcastingtemperatureonsurfacelongitudinalcrack3Table3Technologyparametersofconcastingmould/m3h-1/℃/℃/mm/mmin-1160455.57.51.9120313.01.6140384.51.8120150mm×150mm72.3～110.6m3/h3140m3/h160m3/h2111530℃50%1555℃35～50℃30523═════════════════════════════════════════════════════════════1#1491283190～100m3/h7℃40℃6mm0.5%～0.6%1002LF25～30℃342001121SWRCH35K1530℃0.55L/kg43300～400mm48015107872.01222Fig.2Comparisonofcrackindexofconcastingbilletbeforeandafterprocessimprovement4123459%12%SWRCH35K1..20002..19943..19993119952002-05-20156SWRCH35K═════════════════════════════════════════════════════════════