It is easy to cause various defects while using small cupola to smelt the nodular graphite iron.
采用小型冲天炉熔炼球铁，易于产生各种缺陷。
The production of light nodular graphite iron parts with high ductility in investment casting was expounded in all aspects including both technological analysis and processing control.
对熔模精密铸造高韧度球墨铸铁小件的生产，从工艺分析到生产过程的控制进行阐述。
There are two categories of on-spot rapid graphite morphology te st methods for nodular iron production at present: direct method and indirect method.
球铁石墨形态炉前快速识别技术目前有直接快速检测和间接快速检测两大类。
This paper analyses the band structure with nodular graphite that was first found on the cross section of the gray iron bar in the experiment.
通过试验分析，首次在灰铸铁型材断面上观察到球状石墨的带状区，并对这种带状组织及成因进行了分析探讨。
The self-compensated contraction caused by graphite dilatation in the solidification process of nodular cast iron makes casting with less flow-off or casting without flow-off possible.
利用球墨铸铁凝固过程中的石墨化膨胀，进行自身补缩，可以实现少胃口或无冒口铸造。
It is a basic demand for evaluating the microstructure and performance to determine the graphite size and its spheroidization rate in nodular cast iron.
正确测定球墨铸铁中石墨大小及球化率，是对球墨铸铁组织性能进行评定的基本要求。
This problem could be solved by using ferrite nodular graphite cast iron.
采用以铁素体为基的蠕墨铸铁可解决此问题。
The domestic and foreign nodular graphite cast iron standard samples were analyzed with vacuum direct-reading spectrometer and were applied in the routine analysis.
运用真空直读光谱仪分析国产和国外产球墨铸铁标样，并应用在生产实践、炉前分析中；
With a history of more than 80 years in founding production, DHIF is one of the manufacturers who have the longest history in China in production of nodular graphite cast iron and non-ferrous alloys.
大重铸铁拥有80多年铸造生产的历史，是国内生产球墨铸铁和有色合金历史最悠久的厂家之一。
Better control of different layer may be essential to good combination of high-speed steel with nodular graphite cast iron.
控制好扩散层是实现高速钢与球墨铸铁良好结合的关键。
Better control of different layer may be essential to good combination of high-speed steel with nodular graphite cast iron.
控制好扩散层是实现高速钢与球墨铸铁良好结合的关键。
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