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Selection of raw materials and control of trace elements for production of high-quality SG iron

China Foundry 2019年第2期16卷 79-87页

作者： Jia-xin Bai China University of Geoscience Beijing

During the production of SG iron, the selection of raw materials and control of chemical composition are most important. From the very early days of SG iron production, the effects of trace elements on graphite form and matrix structure have been studied, and the allowable concentration limits for their detrimental influence has been decreased year by year, during the last fifty years. This paper has reviewed some of the suggested SG iron trace elements in the literature and in several Chinese foundries. It was found that for most SG iron castings, rare earth elements are still required to neutralize the harmful effects of trace elements and improve SG iron quality. It also found that the use of high purity and ultra-high purity base iron melts enabled integrated, safety-critical and complicated SG iron castings of varying thickness, and heavy-section, to be produced successfully. These SG iron castings have surprisingly good structures, and their mechanical and dynamic properties are vastly superior to those specified in current international SG iron standards. Further study is required on the effects of using high purity and ultra-high purity base melts on the structure and properties of SG iron.

关键词： trace elements anti-nodulizing and pearlite factors chunky graphite high and ultra-high purity pig iron high quality SG iron

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Some paradoxical observations about spheroidal graphite degeneracy

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China Foundry 2018年第6期15卷 457-463页

作者： Jacques Lacaze Jon Sertucha CIRIMAT Université de ToulouseBP 44362F-31030ToulouseFrance Investigaeiòn y Desarrollo de Procesos Metalúrgicos IK4-AzterlanAliendalde auzunea 6E-48200Durango(Bizkaia)Spain

Differential thermal analysis experiments have been performed on samples machined from Y2-blocks cast with different high-silicon spheroidal graphite irons. Depending on magnesium, silicon, cerium and antimony content, the as-cast microstructure showed various levels of chunky graphite in the central part of the blocks. In contrast, the microstructure of the materials after remelting and resolidification during differential thermal analysis consisted of lamellar or compacted graphite. The formation of chunky graphite in the as-cast microstructure is rationalized using an index or silicon equivalent that has been recently suggested. The differences in the microstructures after differential thermal analysis are discussed in terms of available free magnesium. Emphasis is finally put on the striking differences in characteristic size of the microstructures made of compacted graphite as compared to lamellar graphite and chunky graphite. This leads to tentative conclusions about growth of compacted and chunky graphite which would be worthy of further experimental investigations.

关键词： high-silicon spheroidal graphite iron graphite degeneracy compacted graphite chunky graphite

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