中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2013年
21期
2960-2965,2966
,共7页
非稳态浇注%压下区间%凝固传热%连铸板坯
非穩態澆註%壓下區間%凝固傳熱%連鑄闆坯
비은태요주%압하구간%응고전열%련주판배
transient casting%reduction zone%solidification heat transfer%continuous casting slab
为保证连铸板坯动态轻压下技术的有效实施以减轻中心偏析和中心疏松,改善铸坯内部质量,针对实际生产时的非稳态浇注过程,根据铸坯表面温度的测量数据,修正了实时凝固传热模型,分析了拉速、过热度和二冷比水量等工艺参数的变化对不同钢种压下区间长度的影响规律。结果表明:拉速每增加0.1m/min,船板钢AH36和碳素结构钢 Q235B的压下区间长度分别增加0.15m、0.21m;过热度每增加10℃,AH36和 Q235B 的压下区间长度分别增加0.01m、0.015m;二冷比水量每增加0.1 L/kg,AH36和 Q235B的压下区间长度分别减少0.04m、0.06m。将凝固传热模型应用于生产中,优化了动态轻压下模型,铸坯中心偏析减为1.0B~0.5C,中心疏松级别小于1.5级的铸坯比率由35.25%上升到85.16%,铸坯内部质量得到了明显改善。
為保證連鑄闆坯動態輕壓下技術的有效實施以減輕中心偏析和中心疏鬆,改善鑄坯內部質量,針對實際生產時的非穩態澆註過程,根據鑄坯錶麵溫度的測量數據,脩正瞭實時凝固傳熱模型,分析瞭拉速、過熱度和二冷比水量等工藝參數的變化對不同鋼種壓下區間長度的影響規律。結果錶明:拉速每增加0.1m/min,船闆鋼AH36和碳素結構鋼 Q235B的壓下區間長度分彆增加0.15m、0.21m;過熱度每增加10℃,AH36和 Q235B 的壓下區間長度分彆增加0.01m、0.015m;二冷比水量每增加0.1 L/kg,AH36和 Q235B的壓下區間長度分彆減少0.04m、0.06m。將凝固傳熱模型應用于生產中,優化瞭動態輕壓下模型,鑄坯中心偏析減為1.0B~0.5C,中心疏鬆級彆小于1.5級的鑄坯比率由35.25%上升到85.16%,鑄坯內部質量得到瞭明顯改善。
위보증련주판배동태경압하기술적유효실시이감경중심편석화중심소송,개선주배내부질량,침대실제생산시적비은태요주과정,근거주배표면온도적측량수거,수정료실시응고전열모형,분석료랍속、과열도화이랭비수량등공예삼수적변화대불동강충압하구간장도적영향규률。결과표명:랍속매증가0.1m/min,선판강AH36화탄소결구강 Q235B적압하구간장도분별증가0.15m、0.21m;과열도매증가10℃,AH36화 Q235B 적압하구간장도분별증가0.01m、0.015m;이랭비수량매증가0.1 L/kg,AH36화 Q235B적압하구간장도분별감소0.04m、0.06m。장응고전열모형응용우생산중,우화료동태경압하모형,주배중심편석감위1.0B~0.5C,중심소송급별소우1.5급적주배비솔유35.25%상승도85.16%,주배내부질량득도료명현개선。
To reduce center segregation and center porosity and improve internal quality of casting slabs based on adopting dynamic soft reduction,according to the measured data of the slab surface temperature during the actual production process of transient casting,a solidification heat transfer model was corrected.The variation rule of the effect of casting speed,superheat degree,and specific water flow on reduction position was analysed.The results show that for every 0.1 m/min increases in casting speed,the reduction length of AH36 and Q235B increases 0.15m and 0.21m respectively,and for every 10℃ increases in superheat degree,the reduction length of AH36 and Q235B increases 0.01m and 0.015m respectively,and for every 0.1L/kg increases in specific water flow,the reduction length of AH36 and Q235B increases 0.04m and 0.06m respectively.After the solidification heat transfer model was applied to production,the center segregation reduces to 1.0B~0.5C,and the cen-ter porosity less than level 1.5 increases from 35.25% to 85.16%,and the slabs internal quality is im-proved obviously.