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1、毕业课题课题名称:浅议连铸坯质量控制学号姓名马军专业班级指导教师2011年10M21H连铸坯质量决定着最终产品的质量。从广义来说所谓连铸坯质量是得到合格产品所允许的连铸坯缺陷的严重程度,连铸坯存在的缺陷在允许范围以内,叫合格产品。连铸坯质量是从以下几个方面进行评价的:(1)连铸坯的纯净度:指钢小夹杂物的含量,形态和分布。(2)连铸坯的表面质量:主要是指连铸坏表面是否存在裂纹、夹渣及皮下气泡等缺陷。连铸坯这些表面缺陷主要是钢液在结晶器内坯壳形成生长过程中产生的,与浇注温度、拉坯速度、保护渣性能、浸入式水口的设计,结晶式的内腔形状、水缝均匀情况,结晶器振动以及结品器液血的稳定因素有关。(3
2、)连铸坯的内部质量:是指连铸坯是否具有正确的凝固结构,以及裂纹、偏析、疏松等缺陷程度。二冷区冷却水的合理分配、支撑系统的严格对中是保证铸坯质量的关键。(4)连铸坯的外观形状:是指连铸坯的儿何尺寸是否符合规定的要求。与结品器内腔尺寸和表面状态及冷却的均匀程度有关。木文从以上四个方面对实际生产中连铸坏的质量控制采取的措施进行说明。关键词:连铸坯、质量、控制AbstractCastingbilletqualitydeterminesthequalityofthefinalproduct・Fromthegeneralizedcastingbilletqualityisforso-calledg
3、etqualifiedproductsallowedbytheseverityofcastingbilletdefects,thedefectsofcontinuouscastingslabinallowingscope,callofqualifiedproducts・Castingbilletqualityfromthefollowingseveralaspectstoevaluate:(1)Isdramatically:referstothecontinuouscastingslabinsteelinclusioncontent,formanddistribution.(2)The
4、surfaceofcontinuouscastingslabquality:mainlyreferstotheexistenceofcastingbilletsurfacecracks,slaginclusionandsubcutaneousbubbleetcdefects.Thesesurfacedefectscastingbilletismainlyinthecrystallizerliquidsteelsolidifiedshellproducesintheprocessofforminggrowth,andpouringtemperature,throwingspeed,pro
5、tectionofslag,intothedesign,crystallizationtypespouttheinnerchambershape,water,seamuniformmouldoscillationandmouldtheliquidsurfacestabilityfactors.(3)Theinternalqualityofcastingbillet:referstowhetherhasthecorrectcastingbilletsolidificationstructure,andcrack,segregation,loosedefectssuchasdegree.T
6、wocolddistrictcoolingwaterrationing,supportingsystemforthestrictistheguaranteeofbilletqualityinthekey.(4)Theappearanceofcontinuouscastingslabshape:referstothegeometricsizeofcastingbilletcomplianeewithrequirements.Andthemouldcavitydimensionsandwithintheuniformcoolingsurfacestateanddependon.Thisar
7、ticlefromtheabovefouraspectstoactualproductionofcastingbilletqualitycontrolmeasurestakenforinstructions.Keywords:castingbillet,quality,control摘要10录31.连铸坯纯净度与产品质量41.1纯净度与质量的关系41.2提高纯净度的措施42•连铸坯的表面质量52.1表面裂纹52.2表面夹渣62.3皮下气泡与气孔