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首页> 外文会议>New developments on metallurgy and applications of high strength steels >ELEVATED TEMPERATURE PROPERTIES OF Nb-MICROALLOYED “FIRE-RESISTANT” CONSTRUCTIONAL STEELS
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ELEVATED TEMPERATURE PROPERTIES OF Nb-MICROALLOYED “FIRE-RESISTANT” CONSTRUCTIONAL STEELS

机译：Nb-微合金“防火”建筑钢的高温性能

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Fire-resistant constructional steels have been commercialized in some parts of the world, and are being examined in the USA. Current activities are focused on development of specifications for testing of elevated temperature properties, and it is envisioned that some material specifications and niche applications (e.g. high-rise building columns, structures where friable insulated coatings are undesirable, etc) will follow eventually. Selected metallurgical studies are reviewed, with a focus on Nb-containing steels that are intended to help understand the microstructure/property relationships that control fire-resistant (FR) properties. Specific examples are cited which illustrate the apparent benefit of Mo in suppressing precipitate coarsening rates at elevated temperature, beneficial effects of microstructure refinement, microalloy precipitation, and warm working of ferrite on the FR properties. The concept of “active” fire resistance is illustrated (confirmed with both Cu and Nb containing steels thus far), whereby alloying and processing are designed to allow strengthening precipitates to form in the microstructure as a consequence of the heating encountered during a fire.
机译：耐火建筑用钢已经在世界某些地区商业化，并且正在美国进行检验。当前的活动集中于开发用于测试高温性能的规范，并且可以预见，最终将遵循一些材料规范和特殊应用（例如高层建筑立柱，不希望使用易碎的绝缘涂层的结构等）。审查了一些冶金研究，重点是含铌钢，旨在帮助理解控制耐火（FR）性能的微观结构/性能关系。列举了具体的例子，这些例子说明了Mo在抑制高温下的析出物粗化速率方面的明显益处，微结构细化，微合金析出以及铁素体的热加工对FR性能的有益影响。图示了“主动”耐火性的概念（到目前为止，已被含Cu和Nb的钢所证实），通过合金化和工艺设计，可以增强由于火中遇到的热量而在微观结构中形成强化的沉淀。

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