The solidification of 4.4 t cold work tool steel ingot type X210Crl2 was simulated by Magma software. By the reduction of ingot height, solidification modeling and pouring of a new 3 t ingot were performed and decreas...The solidification of 4.4 t cold work tool steel ingot type X210Crl2 was simulated by Magma software. By the reduction of ingot height, solidification modeling and pouring of a new 3 t ingot were performed and decreasing the porosity formation potential in 3 t ingot in comparison with 4.4 t ingot on the basis of Niyama criterion was ob-served which was in good accordance with experimental data. In order to produce sound ingot, a new 2.8 t ingot mould was designed which includes some parameteric changes in mould such as mould slope, slenderness ratio, mould concavity radius, fillet radius of mould internal corners and feeding diameter to ingot upper diameter ratio. Furthermore, the effects of insulating between kokil and feeding ring and also insulating the outer surface of feeding ring as well as insulating the outer surface of one third of kokil upper part on eenterline porosity formation were in-vestigated in both 2.8 and 4.4 t ingots. The results show that the ingot which was produced in new designed 2.8 t mould has a better Niyama pattern and the centerline porosities were eliminated.展开更多
针对某钢厂6 t H13钢锭平均钢锭利用率和探伤合格率低的问题,对影响品质的相关因素进行了统计分析,得知因冒口补缩效果差引起的裂纹和疏松缺陷占不合格钢锭总量的50%以上;并分析了影响冒口补缩效果的因素及具体表现。然后,通过改良绝热...针对某钢厂6 t H13钢锭平均钢锭利用率和探伤合格率低的问题,对影响品质的相关因素进行了统计分析,得知因冒口补缩效果差引起的裂纹和疏松缺陷占不合格钢锭总量的50%以上;并分析了影响冒口补缩效果的因素及具体表现。然后,通过改良绝热板材质、调整浇注制度,进而降低冒容比,使钢锭的探伤合格率由不足90%提升至96%(以大棒为验收标准),钢锭利用率由80%提升至88%。展开更多
文摘The solidification of 4.4 t cold work tool steel ingot type X210Crl2 was simulated by Magma software. By the reduction of ingot height, solidification modeling and pouring of a new 3 t ingot were performed and decreasing the porosity formation potential in 3 t ingot in comparison with 4.4 t ingot on the basis of Niyama criterion was ob-served which was in good accordance with experimental data. In order to produce sound ingot, a new 2.8 t ingot mould was designed which includes some parameteric changes in mould such as mould slope, slenderness ratio, mould concavity radius, fillet radius of mould internal corners and feeding diameter to ingot upper diameter ratio. Furthermore, the effects of insulating between kokil and feeding ring and also insulating the outer surface of feeding ring as well as insulating the outer surface of one third of kokil upper part on eenterline porosity formation were in-vestigated in both 2.8 and 4.4 t ingots. The results show that the ingot which was produced in new designed 2.8 t mould has a better Niyama pattern and the centerline porosities were eliminated.
文摘针对某钢厂6 t H13钢锭平均钢锭利用率和探伤合格率低的问题,对影响品质的相关因素进行了统计分析,得知因冒口补缩效果差引起的裂纹和疏松缺陷占不合格钢锭总量的50%以上;并分析了影响冒口补缩效果的因素及具体表现。然后,通过改良绝热板材质、调整浇注制度,进而降低冒容比,使钢锭的探伤合格率由不足90%提升至96%(以大棒为验收标准),钢锭利用率由80%提升至88%。
