product news/產品新聞
Another purpose-designed product provided a 200-ton lift capacity for handling BOP equipment offshore. Cranes for use in the corrosive atmospheres of the galvanic industry have also been supplied. The J D Neuhaus cranes are insensitive to dust,
humidity and aggressive atmospheres as standard, operating within a temperature range of -20°C to +70°C. They provide 100% duty ratings with no downtime and only minimum maintenance require- ments. Overload protection and fail-safe braking are incorporated, together with emergency-stop safety features. Special limit switch arrangements for end- travel, anti-collision and protected zone status are also incorporated as required. ■
力。此外，还研发了用于电力行业的耐腐蚀的起重设 备。
J D Neuhaus起重机对于粉尘、湿度和一般的恶劣环 境不敏感，工作温度范围可从-20°C到+70°C。在不停 工并且只需最低的维护要求，JDN起重机可提供100% 的责任评级。起重机融合了超负荷保护和自动防故障装 置制动设备，具有紧急停机保护功能。还为终端运行、 防碰撞、保护区设计了特殊的限位开关。 ■
Selecting Materials for the Production of Quality Ductile Iron 高质量球墨铸铁的选材
Whereas preconditioning, nodularization and inoculation
in the production of ductile iron may all be regarded as sepa- rate processes, the overall effects cannot be separated. A poor choice in selecting any one of these can have a very negative effect on the quality of the final iron. For this reason alone, metalcasters should have a “treat-
ment champion” who has a good working knowledge of the effects of alloys on the treatment processes. Tis will vary, and each foundry is individual in terms of their conditions. Elkem, Oslo, Norway, has developed product portfolios designed to meet the vast majority of these needs. At the beginning of the process, selection of decent
quality raw materials and charge alloys will add nuclei to the iron. Where the melting furnace is large or the overall holding time is long, the addition of Preseed preconditioner is often seen as beneficial, as it adds and stabilizes nuclei and ensures optimum graphite nucle- ation during the solidification. Most metalcasting facilities are conscious of environ-
mental concerns and want to get the highest efficiency from their MgFeSi alloy. Low reactivity alloys and alloys designed to help control shrinkage, for example, are available as the technology of MgFeSi alloys advances. Elkem has a wide range of chemistries available designed to suit all treatment vessel sizes and designs. Having created a nodularized iron with residual nucle-
ation, the final stage of inoculation is possibly the most crucial in the process, particularly as OEM demands on the iron increase. Selection of the correct inoculant, or in many cases multiple inoculants, will have a significant bearing on the microstructure and mechanical properties of the iron. OEM requirements to meet legislations will increase.
Solid solution strengthened ferritic ductile irons for example, are beginning to emerge from the infancy stage. While these present new challenges to the metalcaster, Elkem has pack-
ages of products available, optimized for these irons. ■ For further information, please contact your local Elkem representative.
虽然预处理、球化和孕育在球墨铸铁的生产中可以 被认为是独立的工艺，但是其总体效果不应被分割。 任一工艺中的错误选择都会对铸件最终的质量产生非 常消极的影响。
仅仅由于这个原因，铸造企业中就应该有这样的“ 处理卫士”，能够非常清楚地知道处理工艺对合金的 影响。而根据铸造厂自身的情况，影响将有不同。 挪威奥斯陆的Elkem公司研发出的产品组合可满足 大多数需求。
在熔炼的开始阶段，选择质量好的原材料和合金炉 料将增大铸铁的成核率。在大型熔炼炉或者保温时间 长的情况下，一般认为预处理是有利的，因为它可以 增强并稳定成核水平，确保凝固过程中最佳的石墨成 核效果。
大多数铸造企业都意识到环境保护的问题，并希望 最大的程度的获得MgFeSi合金的功效。例如，随着 MgFeSi合金技术的发展，已研发出低反应性的合金并 用来抑制缩松。Elkem公司拥有适合所有处理设备尺 寸和设计的广泛的化学产品。
球铁生产中残余晶核的创建，最后的孕育处理环节 可能是最关键的，尤其在OEM企业对铸铁产品要求提 高的情况下增加。合适的孕育剂的选择，在很多情况 下是复合的孕育剂，将对球铁的微观组织结构和机械 性能产生显著的影响。
OEM企业产品标准的要求将提高。例如，固溶强化 铁素体球铁已在研发阶段。针对目前铸造企业面临的
新挑战，Elkem公司有很多产品组合以优化铸铁。 ■ 更多信息，请与Elkem公司当地经销商联系。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION December 2014
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