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首页> 外文期刊>Corrosion Engineering, Science and Technology >Influence of chemical composition on intergranular corrosion susceptibility of novel Super304H austenitic heat-resistant steel
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Influence of chemical composition on intergranular corrosion susceptibility of novel Super304H austenitic heat-resistant steel

机译：化学成分对新型Super304H奥氏体耐热钢晶间腐蚀敏感性的影响

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摘要

In order to investigate the influence of chemical compositions on the intergranular corrosion (IGC) resistance of the Super304H steel, the chemical compositions and IGC levels of as received Super304H tubes were analysed and evaluated respectively by spectral analysis, scanning electron microscopy and immersion test in H_2SO_4-CuSO_4-Cu chip solution. The results show that there exist four IGC levels in all the tubes. In condition of similar C content or similar Nb content, the IGC susceptibility is revealed to change randomly with the increasing Nb content or C content, respectively. Further more, when C content is more than 0.10%, Super304H steel will be easily sensitised to IGC, while almost all the tubes without IGC susceptibility have Nb content close to 0.60% of upper Nb limit. As to the influence of Nb/C mass ratio on IGC resistance, the sample with Nb/C ratio less than 5.00 will be easily sensitised and the sample with Nb/C ratio more than 8.15 will have no IGC susceptibility, but the IGC levels of tubes with Nb/C ratio between 5.00 and 8.15 incline to fluctuate randomly. The high susceptibility of some samples in this Nb/C region is attributed to the improper heat treatment process.
机译：为了研究化学成分对Super304H钢抗晶间腐蚀（IGC）性能的影响，通过光谱分析，扫描电子显微镜和在H_2SO_4中的浸没试验分别分析和评估了所接收的Super304H管的化学成分和IGC水平。 -CuSO_4-Cu芯片解决方案。结果表明，所有试管中均存在四个IGC水平。在相似的C含量或相似的Nb含量的条件下，IGC敏感性显示出随Nb含量或C含量的增加而随机变化。此外，当C含量超过0.10％时，Super304H钢将易于对IGC敏感，而几乎所有无IGC敏感性的管材的Nb含量均接近Nb上限的0.60％。关于Nb / C质量比对IGC电阻的影响，Nb / C比小于5.00的样品很容易致敏，Nb / C比大于8.15的样品没有IGC敏感性，但是IGC的水平为Nb / C比在5.00和8.15之间的试管倾向于随机波动。此Nb / C区域中某些样品的高磁化率归因于热处理工艺不当。

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