CAUSE ANALYSIS OF CRACKING DUE TO INTERCRYSTALLINE CORROSION FOR Sper304H TUBES

ZHANG Chunlei Electric Power Science Research Institute under Guangdong Power Grid Corp

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CAUSE ANALYSIS OF CRACKING DUE TO INTERCRYSTALLINE CORROSION FOR Sper304H TUBES

Thermal Power Generation Vol. 41, Issue 5, Pages: 65-68(2012)

更新时间：2025-09-28

- CAUSE ANALYSIS OF CRACKING DUE TO INTERCRYSTALLINE CORROSION FOR Sper304H TUBES
- 作者机构：
  
  广东电网公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG142.1
- Published：2012
- 稿件说明：
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ZHANG Chunlei Electric Power Science Research Institute under Guangdong Power Grid Corp. CAUSE ANALYSIS OF CRACKING DUE TO INTERCRYSTALLINE CORROSION FOR Sper304H TUBES[J]. Thermal Power Generation, 2012, 41(5): 65-68.
DOI：

ZHANG Chunlei Electric Power Science Research Institute under Guangdong Power Grid Corp. CAUSE ANALYSIS OF CRACKING DUE TO INTERCRYSTALLINE CORROSION FOR Sper304H TUBES[J]. Thermal Power Generation, 2012, 41(5): 65-68. DOI：

摘要

某电厂Super304H钢过热器和再热器在机组试运行过程中

连接短管和管屏的焊接接头附近出现晶间腐蚀

导致多处泄漏。通过对材料化学成分分析、能谱分析、金相组织和扫描电镜观察

以及钢管敏化后的晶间腐蚀试验

结果表明:Super304H钢基体为等轴奥氏体组织

无论是否经过敏化处理

经晶间腐蚀试验并弯曲后均会出现开裂;钢管的含铌量与含碳量之比仅为5.4

碳含量偏高而铌含量偏低易导致晶间腐蚀

并且钢管在堆放过程中受到介质的腐蚀

焊缝收缩所产生的拉应力促进了裂纹的产生和扩展。

Abstract

The intercrystalline corrosion had appeared on the superheater and reheater with Super304H steel tubes

leading to leakage at many locations.The cracked Super304H steel tubes have been sampled

through chemical components analysis

energy spectrum analysis

as well as observation of metallographic structure and using scanning eletron microscope etc.

the causes leading to intercrystalline corrosion of said steel tubes have been obtained.Results show that the basic body of Super304H steel is isoaxial austenitic structure

regardless of sensibilization treanment or not

after test of crystalline corrosion and bending

cracks have appeared.The ratio between niobium content and carbon content is only 5.4

the higher corbon content and lower niobium content are easy to result in intercrystalline corrosion.

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