共查询到17条相似文献,搜索用时 343 毫秒
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特厚钢板坯料的质量问题一直是制约一些高品质特厚钢板国产化的瓶颈。概述了大单重、特厚钢板的市场应用前景、技术难点,以及其生产技术研究的迫切性,介绍了近年来国内外研究的水冷模铸技术、电渣重熔技术、连铸坯焊接复合轧制技术、立式连铸技术等几种特厚钢板制造方法的理论基础、生产效率、铸坯内部质量,并对其研究现状、品种开发进展、技术特点进行了分析,提出了各种技术的优缺点,以便钢铁企业针对自身特点选择适合的最佳技术方案。 相似文献
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以舞钢公司扁锭生产低合金系列特厚钢板探伤不合的缺陷为研究对象,根据钢锭的凝固理论、钢板缺陷各项检测分析以及大钢锭锭型数据模拟优化,从钢水质量、控制手段、锭型设计各方面着手,分析常见缺陷的性质及产生原因,提出了解决扁锭内部缺陷的措施。 相似文献
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介绍了舞钢生产的单重50 t级别的174 mm 12Cr2Mo1R(H)钢板的技术要求、工序工艺控制点及实物质量。通过冶炼时采用C/Al结合脱氧方式,铸锭进行900~940℃保温28~32 h退火处理,轧制时保证道次压下量20~30 mm,并采用正火+加速冷却+回火工艺,钢板组织均匀,各项力学性能及步冷脆化性能均能满足技术要求。钢板内部质量良好,探伤满足NB/T47013.3-2015及第1号修改单T1级。 相似文献
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Effect of increasing mould wall thickness on quality of low alloy square steel ingot of 40cmd8 grade (AISI P20) and of 4 t weight were studied by comparing three cases with the help of FEM simulation. Solidification simulation software THERCAST was used which could predict fluid flow, temperature, solidification, piping and centreline porosity for the cast ingot. With increased mould wall thickness fluid flow was not much affected. Heat transfer was retarded with increased mould wall thickness which delayed the solidification. Solidification profiles were with thin mushy zone and wide shaped which has lesser chances of dendrites bridging and helps in avoiding central porosity. Piping and porosity were predicted based on Niyama criteria. It was seen that porosity in the ingot centre were decreased with increased mould wall thickness. Optimal mould wall thickness could be obtained for square ingot of low alloy steel grade. 相似文献
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