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低溫無磁不銹鋼

  • 摘要: 氫泡室的工作條件,要求制做泡室用的不銹鋼在液態氫的極低溫度(20k)下,有足夠的強度和韌性,在三萬高斯的磁場中導磁率不大于1.005高斯奧斯特,此外,還要求這種鋼有好的加工性能和焊接性能。我們根據氫泡室用鋼的要求,參照美國西屋電器公司研制的kromarc-55不銹鋼,1初步研制出k-55不銹鋼帶材(17.4毫米×240毫米×10米),于室溫,液氮(-196℃)液氦(-269℃)三種溫度下測試了拉伸曲線,測試了低溫下的導磁率μ和膨脹系數α,並對材料的組織和斷口進行了觀察,對材料在低溫拉伸過程中出現的現象進行了探討。實驗結果證明,我們煉制的K-55不銹鋼基本上滿足氫泡室工程要求。

     

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