作者简介:侯敬超(1989－)，男，硕士，工程师;E-mail:hou_jingchao@163．com;收稿日期:2022-08-20DOI:10．20057/j．1003-8620．2022-001052．25Cr-1Mo-0．25V钢148mm厚板尾部分层缺陷分析及控制工艺侯敬超1，赵国昌1，庞辉勇1，吴艳阳1，甄光楠1，赵燕青2(1河钢集团舞钢公司，舞钢462500;2河钢集团钢研总院，石家庄050023)摘要:采用扫描电镜及电子探针对55t钢锭成材148mm厚2．25Cr-1Mo-0．25V钢板尾部分层缺陷进行观察分析，结果表明:分层缺陷是由于模铸保护渣卷入钢液造成的。为减少钢板尾部分层缺陷，对冶炼工艺进行优化，精炼过程中采用碳粉、电石及1．2～2．0kg/t钢Al线复合脱氧工艺，真空后软吹12～14min，采用高粘度、低熔点、高熔速及膨胀系数较大的模铸保护渣。优化工艺后，钢板尾部分层缺陷出现概率分别为11．3%、9．6%、6．9%，分层缺陷导致钢板废品率由原8．1%降至1．7%。关键词:2．25Cr-1Mo-0．25V钢;148mm厚板分层缺陷;模铸保护渣;浇铸;Al2O3夹杂物AnalysisonCausesofDelaminationDefectat148mmHeavyThick-nessPlateTailof2．25Cr-1Mo-0．25VSteelandControlProcessHouJingchao1，ZhaoGuochang1，PangHuiyong1，WuYanyang1，ZhenGuangnan1，ZhaoYanqing2(1HesteelGroupWugangCompany，Wugang462500，2HesteelGroupTechnologyＲesearchInstitute，Shijiazhuang050023)Abstract:Thedelaminationdefectsatthetailof148mmthickness2．25Cr-1Mo-0．25Vsteelplatemadeof55tingotisob-servedandanalyzedbyscanningelectronmicroscopeandelectronprobemicroanalysis．Theresultsshowthatthedelamina-tiondefectsarecausedbytheinvolvementofmoldfluxinthemoltensteel．Inordertoreducethedelaminationdefectsatthetailofsteelplatethesmeltingprocessisoptimized，i．e．inrefiningprocess，thecompositedeoxidationprocessofcar-bonpowder，calciumcarbideand1．2-2．0kg/tsteelAllineisadopted．Aftervacuum，itissoftblownfor12-14min．Themoldcastingprotectiveslagwithhighviscosity，lowmeltingpoint，highmeltingrateandlargeexpansioncoefficientisused．Afteroptimizingthesmeltingprocess，theratioofdelaminationdefectsatthetailofsteelplateis11．3%，9．6%and6．9%respectively，andthescraprateofsteelplatecausedbydelaminationdefectsdecreasesfromoriginal8．1%to1．7%．KeyWords:2．25Cr-1Mo-0．25VSteel;148mmHeavyThickne...
