Modelling-Based Innovative Feeding Strategy for Beam Blanks Mould Casting Aimed at As-Cast Surface Quality Improvement
- 作者：Antonio SgroMarco RinaldiAlessandro CristalliniM. De Santis
- 会议时间：2013-10-22
- 关键词：beam blanks ; flow field ; SEN ; cracks ; shell remelting ; slag entrapment
- 作者单位：Antonio Sgro,Marco Rinaldi(Danieli CentroMet,Italy)Alessandro Cristallini,M. De Santis(Centro Sviluppo Materiali,Italy)
- 母体文献：第九届中国钢铁年会论文集
- 会议名称：第九届中国钢铁年会
- 会议地点：北京
- 主办单位：中国金属学会
- 语种：chi
摘要
Within a CSM–Danieli joint investigation focused on effect of casting conditions on steel quality in an industrial beam blanks mould,different Submerged Entry Nozzles (SEN) geometries were tested with numerical modelling,supported by a suitable Design of Experiments strategy.The innovative nature of the work consisted of the fact that,contrary to the common practice of using two nozzles in the flange-tip zone,feeding with only one nozzle is proposed.The advantage of such a configuration is a simplified mono-slide gate casting layout.But feeding from a single nozzle with relatively small throat can bring about risks of too high steel velocity in the mould harmful for shell integrity and meniscus stability.To face such a drawback,different geometry solutions were checked and,to assess the solutions found,indices were defined,based on literature and validated to evaluate the nozzle flow behaviour.They were related to suitable flow conditions at meniscus,to avoid slag entrapment occurrence,and at walls,to avoid hot-spotting harmful for the solid shell integrity and in turn for the as-cast surface quality.The modelling work gave general indications on flow features related to possible defect occurrence and guidelines were achieved to improve reference conditions,involving number of holes and holes angle,size and shape.A solution,based on a multi-hole geometry,was found satisfying the indices,and expected to fulfil the quality requests.The information was then passed to the nozzle producers and plant reference,both confirming the feasibility and reliability of the solution proposed,to apply the findings on field.