铸态高韧性球铁高炉冷却壁断面效应及控制

铸态高韧性球铁高炉冷却壁断面效应及控制武汉钢铁公司机械总厂（４３００８３）赵书缓大型厚壁铸态高韧性球铁高炉冷却壁［１］，其铸型如图所示。由于浇注时铁水是从中间部位的上部和下部引入的，所以经对实物解剖发现，壁件的下部和侧面的力学性能高于上部和内部，同时...     

高炉用大型厚壁高韧性球铁冷却壁的铸造

本文较详细的叙述了高炉用大型厚壁高韧性球铁冷却壁的铸造过程。其内容包括:铸件结构特点分析及其技术要求、工艺的设计、蛇形钢管的制备、铸型的装配、铸件的热处理以及生产效果。     

铸态高韧性球铁冷却壁的生产工艺

为了稳定获得铸态高韧性球铁高炉冷却壁,结合车间实际生产现状,通过对冷却壁化学成分的选择,原材料及熔炼的控制,球化剂的选择,孕育剂及孕育方式的选择等关键技术的不断试验调整和改进,使生产的高炉冷却壁质量可靠,性能优良,产品合格率达98%以上。     

硅对铸态厚壁高韧性球铁QT400—18影响的研究

本文通过研究硅对高炉冷却壁用铸态球铁的力学性能和导热性能的影响，确定了硅含量的最佳范围；讨论了硅对硅对孕育效果及碎块块状石墨形成的影响。生产实践表明，采用本研究设计的低硅随流孕育方案，成功地生产出铸态厚高性球铁冷却壁。     

冷却条件对厚大断面球铁件凝固特性的影响

模拟壁厚400mm,模数M为20的大型球铁罐体,浇注了一个边长为400mm的立方体铸件,按不同冷却条件,沿一维方向凝固方式,测定了铸件不同部位的凝固曲线和铸件凝固动态曲线.分析了大型球铁件的凝固特征,讨论了铸件壁厚、凝固时间与球墨形态变化的规律.为保证铸件质量,在冷却条件方面提出了可靠的试验依据.     

硅对铸态厚壁高韧性球铁性能的影响

研究硅对高炉冷却壁铸态球铁的力学性能和导热性能的影响，确定了终硅量的最佳范围，讨论了硅对孕育效果及碎块状石墨形成的影响。     

采用钇基重稀土处理厚大断面球铁冷却壁的生产

厚大断面球铁冷却壁在制造过程中易出现球状石墨粗大及数量减少、石墨漂浮、缩孔及缩松等铸造缺陷.通过采取选择钇基重稀土球化剂,合理设计球铁化学成分,设置球化潜伏期控制球化反应,采取全程孕育处理工艺等系列工艺措施,生产出符合质量要求的厚大断面球铁冷却壁产品.     

新日铁高炉冷却壁技术的进展及其在宝钢的应用

从结构、材料、冷却方式和壁厚等方面介绍了新日铁高炉用冷却壁的1～4代演变过程，同时简述了宝钢引进的第3代冷却壁制造技术及其应用概况。认为今后大型高炉冷却系统的设计会向冷却壁倾斜。     

高炉冷却壁水管防渗碳措施

0前言高炉冷却壁内的45无缝钢管冷却管的外表面,在高温铁液浇注冷却壁时受热,易被氧化和渗碳,使钢管变脆。延长高炉镶砖冷却壁的寿命是延长高炉炉身寿命的重要途径。保持冷却管的原有塑性,即使冷却壁长期经受高温开裂时,但水管有一定的塑性不产生裂纹,冷却壁就可以继续使用。所以对冷却壁采取有效的防渗碳措施,是延长冷却壁使用寿命的重要手段。1高炉冷却壁水管解剖检验结果武钢四号高炉大修时,取出了炉身中部八段一块冷却壁进行解剖分析,解剖取出的水管很脆,一弯即断,取水管样进行理化性能检验和金相检验,使用后的力学性能变…     

高炉冷却壁制造工艺的创新应用

通过工艺的创新,保证高炉冷却壁产品的尺寸精度,加强冷却钢管弯曲控制,采用炉内和炉外脱硫方式,强化孕育,保证球化等手段提高产品内在质量,延长冷却壁的使用寿命.     

钇基重稀土复合球化剂试验研究

用保温模拟法、附铸试样法及大断面铸件心部掏料法试验研究了钇基重稀土复合球化剂中重稀土含量（2．5％－5．0％）和稀土中Y2O3的含量（25％－55％）对球化质量和抗球化衰退性及球铁力学性能的影响。结果表明,钇基重稀土复合球化剂净化铁液、球化、抗球化衰退、抗石墨畸变能力强,白口倾向小,能细化基体组织。该球化剂应用于高炉冷却壁、钆、辊等铸件上,可提高其心部力学性能。     

高炉铸钢冷却壁铸造工艺改进

介绍高炉铸钢冷却壁的铸造工艺,特别是模板的制作、内冷铁的使用以及螺栓孔芯子的制作经验.     

Effect of Cooling Rate on Microstructure and Mechanical Properties of Thin-Walled Ductile Iron Castings

This article addresses the effect of cooling rate on microstructure and mechanical properties as determined by changing molding media and section size. The research was conducted for thin-walled iron castings with 2-5-mm wall thickness and for the reference casting with 13-mm wall thickness, using different molding materials (silica sand and insulating sand “LDASC”) to achieve various cooling rates. Thermal analysis was performed to determine the real cooling rate at the beginning of the graphite eutectic solidification. In general, it was found that the predictions based on theoretical analysis of the solidification process of ductile iron are in good agreement with the experimental outcomes. Finally, the present study provides insights into the effect of cooling rate on the graphite nodule count, the ferrite fraction and mechanical properties of thin-walled ductile iron castings. The study shows that the cooling rate of thin-walled castings varies in a wide range (80-15 °C/s) when changing the wall thickness from 2 to 5 mm, accompanied by significantly changing the mechanical properties of ductile iron. The cooling rate can be effectively reduced by applying an insulating sand to obtain the desired properties of thin-walled castings practically in the whole range of ductile iron grades in accordance with the ASTM Standard.     

铸钢冷却壁的铸造工艺

铸钢冷却壁作为换代高炉冷却壁,它与铸铁冷却壁相比有着本质上的性能提升.介绍了铸钢冷却壁铸造过程中各工序的要点,并针对冷却壁热面砖槽造型、冷却水管防熔穿措施和浇注过程控制等铸造难点给出了多种工艺方案,并通过生产实践证明了工艺方案的可行性.     

钇基重稀土对大断面球铁件本体性能的影响

介绍了QT400-18高炉冷却壁铸件的性能要求,并对使用轻稀土球化剂导致铸件力学性能验收不达标的原因进行分析。采用钇基重稀土球化剂进行试验,结果显示铸件本体力学性能和金相组织都达到要求。指出钇基重稀土有加入量范围宽的特点,在原料不稳定的情况下,重稀土的抗干扰性、抗石墨畸变性、抗衰退性能较为明显,能保证铸件心部的球化等级及力学性能。     

板状铸铁件抛丸清理变形研究

研究了正时齿轮室盖抛丸清理变形问题，提出了抛丸使铸铁件变形的锻延机理，给出了抛九清理变形公式。可供板状铸铁件抛九清理工艺设计时参考。     

Corrosion behavior of boro-tempered ductile iron

In this study, the effect of boro-tempering heat treatment on the microstructure and corrosion behavior of unalloyed ductile iron was investigated. The corrosion characteristics of ductile iron have been determined by current-potential curves. To determine the corrosion rates, the anodic and cathodic Tafel regions extrapolating to corrosion potentials were used. The inhibitor efficiency was calculated from i _corr values. Optical microscope and X-ray diffraction (XRD) were used to examine the microstructure of polished and etched specimens. Thicknesses of the boride layers formed on samples were measured by an optical micrometer attached to the optical microscope. Results show that boro-tempering heat treatment can be successfully applied to ductile iron. The corrosion potential has shifted to more positive values in the boronized samples. The boride layer has behaved like an anodic inhibitor. The boronizing time has affected the corrosion rate. The increase in boronizing time has made the coating thicker, which has increased the corrosion resistance of the material. The best inhibition and the lowest corrosion rate have been performed on the sample which was boronized for 5 hours after cooling in furnace. The tempering at higher temperatures leads to an increase in the corrosion resistance of the materials tested here.     

高炉上紫铜与16MnR异种金属的焊接

阐述了紫铜与16Mn R钢异种金属材料焊接在柳钢3#高炉紫铜水冷壁修复中的应用。针对紫铜与16Mn R钢异种金属材料的焊接特点,在制造车间将新紫铜冷却水箱与炉壳等厚的16Mn R钢板(δ=40 mm)焊接制成一个组合工件,在高炉施工现场由组合工件与高炉炉壳直接焊接。加工适当的焊接坡口,选择合理的焊接工艺,成功解决了紫铜与16Mn R钢异种金属材料的焊接问题,按质、按期完成紫铜冷却水箱的更换,获得甲方的一致好评。     

高炉冷却壁破损因为分析

根据安钢8号高炉破损调查的结果,对冷却壁破损的因为进行了分析,认为冷却壁破损不但与铸造质量有关,而且与高炉设计缺陷、炉况难行以及操作制度也有关系,并提出了相应技术措施.