催化裂化装置用波纹管材料的耐蚀性能研究

Corrosion Resistance of Bellow Materials for Catalytic Cracking Unit

对固溶态与冷作态的Incoloy800H、Inconel625、B 315、FN 2和3165种波纹管材料的试样在H2SXO4(连多硫酸)及H2SXO4+15%NaCl溶液中进行了应力腐蚀开裂敏感性测定。结果表明:在H2SXO4中,只有Incoloy800H材料的试样发生了应力腐蚀开裂,且固溶态试样发生开裂的时间较冷作态长,其它材料试样均未发生应力腐蚀开裂。除Incoloy800H外的材料在15%NaCl+H2SXO4溶液中继续浸泡一定时间,试样仍未发生应力腐蚀开裂,但有点蚀现象产生,且同种材料冷作态的抗点蚀的能力优于固溶态的,不同材料的抗点蚀能力,依次为Inconel625、B 315、FN 2和316,逐渐降低。

The susceptivity to stresscorrosion cracking (SCC) in H2SXO4 and 15%NaCl +H2SXO4 solution of Incoloy800H, Inconel625, B315, FN2 and 316 bellow materials in solid solution annealed and coldworked conditions is investigated. The results show that SCC in H2SXO4 occurs only in samples of Incoloy800H and later with solution annealed samples than with coldworked samples, but pitting corrosion occurs in all samples in 15% NaCl+H2SXO4 solution. For the same material, the resistance of coldworked samples to pitting corrosion is more excellent than that of solid solution annealed samples and for different materials, the resistance to pitting corrosion reduces from Inconel625 to B315, FN2 and 316 in sequence.