product news/產品新聞
Cover Alloy Offers Way to Reduce Costs 埃肯公司覆盖剂帮助削减成本
Elkem has introduced Topseed cover alloy as a means
to reduce magnesium addition and lower production costs in ductile iron casting facilities. The use of magnesium ferrosilicon (MgFeSi) to
nodularize cast iron is a significant cost for ductile iron casting facilities. Topseed is designed to maximize the recovery of magnesium and allows for reductions in reac- tivity and higher levels of nucleation. Topseed cover alloy has been formulated to:
• Provide a high density cover for MgFeSi in the ladle, which will delay the onset of reaction, allowing a greater ferostatic head and more iron/magnesium contact.
• Achieve a quiet metal/Mg reaction, less fume, no iron splashing and a safer working environment.
• Give a dry slag which is easy to skim from the metal surface.
• Provide a higher Mg recovery which will then allow for a reduction in MgFeSi or the use of a lower Mg alloy.
• Reduce Mg usage and reactivity; the nucleation of the iron is higher, reducing the need for subsequent inoculation.
• Extend fading time. • Achieve longer lining life. • Keep a clean pocket in the ladle. Topseed is a dense material based on maximum 50%
silicon and, in its closely graded sizing, provides a close packed cover on the MgFeSi. The alloy is endothermic and provides a short-
term barrier to cast iron burning through to reach the MgFeSi. This allows for a greater ferrostatic head in the ladle, therefore increasing the contact between the mag- nesium vapor and the iron. The use of properly designed pockets can lead to high magnesium recoveries, particu- larly when used in conjunction with Elkem’s extensive range of nodularizers. Recent comprehensive tests in metalcasting facilities
have shown a reduction in MgFeSi addition of up to 20% due to excellent magnesium recovery. Elkem manufactures the largest number of MgFeSi chem-
埃肯公司推出了Topseed覆盖剂，通过减少添加镁元 素来降低球墨铸铁厂的生产成本。
使用镁硅铁合金（MgFeSi）作为球化剂对球墨铸铁 厂家是主要的成本。Topseed覆盖剂旨在最大限度地提 高镁的作用，并允许减少反应并提高成核水平。 Topseed覆盖剂的特点有:
•在浇包内实现MgFeSi合金高密度覆盖，这将延缓反 应，保持更大的铁液压头和更多的铁/镁接触 •实现一个安静的金属液/镁的反应，减少烟雾，无铁液 飞溅,工作环境更安全的
•形成干渣，容易从金属液表面扒渣
•提高镁的吸收率，减少MgFeSi合金的使用，或使用镁 含量较低的合金
•减少镁的使用和损失,提高铁液的成核率，减少后续的 处理
•延长衰退时间 •延长炉衬使用寿命 •保持浇包的清洁。 Topseed覆盖剂是一种高密度的硅含量最大为50％ 的MgFeSi合金，合金粒度分级很密。
该合金是吸热的，并且在很短的时间燃烧掉保护膜 使铁液接触到MgFeSi合金。这使得铁液的压头更大， 因此增加了镁蒸气和铁液之间的接触。设计适当的凹坑 使镁的吸收率升高，特别是当配合使用埃肯的系列球化 剂时。
最近在铸造厂中广泛的测试表明，由于优良的镁回收 率，最高可减少20％的MgFeSi合金使用量。 埃肯公司是全世界MgFeSi合金生产数量最多
Topseed cover alloy reduces magnesium addition for ductile iron.
Topseed蓋降低鎂合金球墨鑄鐵此外。 May 2013
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 61
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