9Ni钢是目前国内为缓解能源压力,建设液化天然气储罐所必须国产化的重要基础原材料.论述了9Ni钢的成分、组织结构与性能的关系.深入分析了9Ni钢的低温韧化机制,认为除了回转奥氏体外可能还有其它重要控制冈素,诸如奥氏体/铁索体界面结构、杂质元素含量等.提出应通过细化晶粒、提高钢的纯净度、添加合金元素等手段来改善9Ni钢的低温韧性,提高屈服强度,实现节约成本的目的.
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