共查询到20条相似文献,搜索用时 93 毫秒
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从转炉出钢到连铸各个关键工序,采用示踪的方法系统研究了淮钢长流程(转炉-精炼-真空处理-连铸-轧制)生产的轴承钢中非金属夹杂物来源,重点对精炼、真空处理、连铸3个关键工序钢液中非金属夹杂物情况进行取样分析。结果表明,淮钢长流程生产的轴承钢非金属夹杂物类型为氧化铝、钙铝酸盐、镁铝尖晶石和二氧化硅,非金属夹杂物主要来源于精炼内生、二次氧化和精炼搅拌卷渣或连铸钢包下渣,其中大颗粒非金属夹杂物主要来源于钢包卷渣或连铸钢包下渣,大颗粒非金属夹杂物类型主要为铝酸钙。 相似文献
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对CSP连铸连轧工艺生产SPA-H热轧带钢进行试验,研究了夹杂物对产品性能的影响,探讨了减少钢中夹杂物、提高产品质量的工艺. 相似文献
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针对安钢R6m全弧型板坯连铸机生产中的板表面出现大片非金属夹杂物的问题,通过电解方法提取连铸过程各阶段中的非金属夹杂物。进行粒度分析,找出了连铸过程中非金属夹杂物的含量及粒度变化趋势,指出铸坯中的大颗粒夹杂物是由于中间包钢液中的大颗粒夹杂物被卷入的,通过改善中间包钢水流场可以减少铸坯中的大颗粒非金属夹杂物。 相似文献
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对钢中夹杂物的来源、分布以及危害进行了叙述,着重介绍了炼钢和连铸工艺中减少夹杂物的脱氧净化、电磁净化、固体电解质净化、钢包净化、过滤净化等生产工艺措施,认为钢中的夹杂物不可能都要降到最低,应根据不同材料和用途将夹杂物减少到合适的水平即可 相似文献
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对钢中夹杂物的来源、分布以及危害进行了叙述。着重介绍了炼钢和连铸工艺中减少夹杂物的脱氧净化、电磁净化、固体电解质净化、钢包净化、过滤净化等生产工艺措施,认为钢中的夹杂物不可能都要降到最低,应根据不同材料和用途将夹杂物减少到合适的水平即可。 相似文献
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夹杂物是影响IF钢表面质量的重要因素。对某厂生产的IF钢连铸坯和热轧板取样, 采用光学显微镜、扫描电镜、能谱、大样电解等多种检测分析方法, 分析了夹杂物的形貌、尺寸、数量、分布以及成分等。研究发现, 热轧工艺的轧制作用使连铸坯宽度方向1/4处聚集的夹杂物向边部迁移, 最终造成热轧板边部夹杂物指数最高, 说明夹杂物聚集带在轧制过程中具有遗传性。热轧板中20 μm以下夹杂所占百分比与连铸坯中夹杂相比稍有增大, 50 μm以上夹杂所占百分比稍有降低。热轧工艺的轧制作用将连铸坯中大颗粒氧化铝夹杂挤压变形为热轧板中的长条状, 容易形成表面条状缺陷。夹杂物在连铸坯距内弧侧30 mm处存在聚集现象, 热轧板中距内弧侧0.5 mm处夹杂物指数最高, 这是由于等效应变不同使夹杂物聚集带向表层迁移。IF钢连铸坯和热轧板中主要有4类显微夹杂, 分别为Al2O3类、TiN、Al2O3-TiOx和SiO2类复合夹杂, 且两者中各类夹杂物所占百分比差别不大。 相似文献
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超低头板坯夹杂物来源分析及控制实践 总被引:2,自引:1,他引:1
板坯夹杂物尤其是大理闪杂物的存在,直接影响钢板的疲劳寿命和力学性能,分析了邯钢板坯夹杂物的来源,分布、控制铸坯夹杂物的手段。 相似文献
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管线钢连铸坯洁净度研究 总被引:6,自引:1,他引:5
针对武钢三炼钢厂“BOF→ Ar→ RH→ L F→ CC”的管线钢生产工艺 ,采取示踪剂示踪、系统取样、综合分析的方法 ,对 RH处理前后、L F处理前后、中间包和铸坯中 T[O]、显微夹杂及宏观夹杂物的变化进行了系统研究。研究表明 ,铸坯中 T[O]平均值为 0 .0 0 14 7%和 0 .0 0 182 % ,显微夹杂物为 2 .78个 / m m2 ,大型夹杂物数量为 1.13mg/ (10 kg) ,各项洁净度指标均达到了很高水平 ,同时夹杂物已基本变性为钙铝酸盐及钙铝酸盐与硫化钙组成的复合夹杂 相似文献
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Mirko Javurek Philipp Gittler Roman Rssler Bernhard Kaufmann Hubert Preßlinger 《国际钢铁研究》2005,76(1):64-70
The liquid steel flow and the particle transport of non‐metallic inclusions in the liquid domain inside the strand of a continuous steel casting system are numerically investigated. The whole liquid domain inside the solidified shell is simulated, and the loss of liquid steel due to solidification is considered. Assuming a constant drift velocity, a kind of Euler‐Euler multiphase model is implemented to calculate the inclusion behaviour inside the liquid steel, respectively the inclusion removal at the boundaries. The turbulent flow of the liquid steel and the inclusion behaviour are calculated. The resulting distribution of the inclusions in the slab is compared with measurements. The influence of inclusion size (0 to 1 mm) and casting speed on the inclusion distribution is considered. 相似文献
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Hatto F. Jacobi 《国际钢铁研究》2006,77(8):558-564
The demand for cleaner steels requires reducing the number of macroscopic non‐metallic oxide inclusions. A major problem of “clean steel” is the measurement and evaluation of the rare large inclusions which exceed a critical size harmful to the product. To this end, volumetric methods of evaluating macro‐inclusions in the three‐dimensional steel matrix are necessary to qualify steel heats or continuous cast slabs and to check if the refining and casting processes are stable and have been improved. Ultrasonic scans are a powerful tool to assess the quality of the volume. In order to activate macroscopic oxide inclusions for the reflexion of the ultrasound, as‐cast material is deformed by hot rolling. The aim of the present research work was to find out the most effective hot rolling practice with respect to ultrasonic detection of the rare large oxide inclusions. For this purpose, heavily contaminated neighbouring slab samples, corresponding to a severe incidence of ladle slag carryover, were hot rolled in a different manner. The 23‐kg‐samples were either elongated by a ratio λ = 2, 3, 10 or 15, or alternatively cross‐rolled, e.g. spread and stretched by ratios 2 × 5 or 3.2 × 3.2. The best compromise to quantify macroscopic steel cleanliness under consideration of cost and time requirements is based on the pure 10fold elongation or the cross‐rolling by 2fold x 5fold. It likewise became clear that rare large oxides can be detected with good sensitivity, as long as the hot rolling reduction ratio is large enough. 相似文献