工業加熟.28·INDUSTRIALHEATINGD01:10.3969/j.issn.1002-1639.2023.06.007超宽板坏热装直送工艺实践研究马刘军，常运合，吴伟勤（南京钢铁股份有限公司，江苏南京211500）摘要：中厚板坏热装直送工艺可大幅度降低加热炉能耗，降低钢材生产成本。南钢超宽板坏因宽厚比大，极易产生纵向裂纹，南钢板材铸机表面纵向裂纹发生率高，且超宽板坏因铸坏平整度差去毛刺困难，且在热装直送过程中因两相区温度区间入炉，导致钢板表面产生了热装裂纹，因此宽板坏纵向裂纹、去毛刺和热装裂纹问题成为南钢板材铸机实现流程优化、铸坏热装直送和节能降耗的关键问题。详细描述了南钢超宽板坏铸机热装直送工艺实践过程，优化铸机去毛刺工艺，并对产生的板坏纵向裂纹和钢板表面热装裂纹产生原因进行分析，优化影响板坏表面纵向裂纹连铸生产工艺制度，同时根据钢种成分特点，调整优化不同钢种成分钢种坏料堆冷时间和控制入炉温度，避开热装裂纹敏感温度区，避免了热装裂纹，实现了超宽板坏热装直送工艺，降低了轧钢加热炉生产能耗。关键词：热装直送；裂纹；冷却时间；表面温度中图分类号：TF777.1Abstract:Theprocessofhotcharginganddirecttransmissionofmediumthickslabcangreatlyreducetheenergyconsumptionofheatingfur-naceandtheproductioncostofsteel.Duetothelargewidthtothicknessratio,theultrawideslabofNISCOispronetolongitudinalcracks.TheoccurrencerateoflongitudinalcracksonthesurfaceofNISCO'sslabcastingmachineishigh,anditisdifficulttodeburrtheultrawideslabduetopoorflatnessoftheslab.Duringthehotcharginganddirectfeedingprocess,duetothetemperaturerangeofthetwo-phasezoneenteringthefurnace,hotchargingcracksoccuronthesurfaceofthesteelplate.Therefore,theproblemsoflongitudinalcracks,deburringandhotchargingcracksinthewideslabhavebecometheprocessoptimizationofNISCO'sslabcastingmachineThekeyissuesofhotcharginganddirectdeliveryofbillets,aswellasenergyconservationandconsumptionreduction.ThisarticleprovidesadetaileddescriptionofthepracticalprocessofhotcharginganddirectdeliveryofNISCO'sultrawideslabcastingmachine,optimizingthedeburringprocessofthecastingma-chine,andanalyzingthecausesoflongitudinalcracksintheslabandhotchargingcracksonthesurfaceofthesteelplate.Italsooptimizesthecontinuo...
