0Cr18Ni9不銹鋼換熱管應力腐蝕開裂原因分析

0Cr18Ni9不銹鋼換熱管應力腐蝕開裂原因分析Cause Analysis on Stress Corrosion Cracking of 0Cr18Ni9 Stainless Steel Heat Exchange Tubes

某管板式換熱器運行不到2個月，換熱管進口端即發生開裂。通過宏觀分析、化學成分分析、水質分析、金相分析、斷口以及能譜分析等方法，對換熱管開裂屬性及原因進行了分析。結果表明：該換熱管開裂為應力腐蝕開裂；循環冷卻水中較高含量的氯離子以及換熱管進口端處于應力腐蝕敏感溫度區導致了應力腐蝕的快速發展。最后，給出了進行焊后熱處理和加強循環冷卻水處理的建議。

After a tube-in-sheet heat exchanger being put into use for less than 2 months, cracking happened at the inlet end of the heat exchange tubes. By means of macro analysis, chemical composition analysis, water quality analysis, metallographic analysis, fracture analysis, energy spectrum analysis and so on, the cracking property and reasons of the heat exchange tubes were analyzed. The results show the cracking of the heat exchange tubes was stress corrosion cracking which caused by the combined action of high content of chloride ion in the circulating cooling water and stress corrosion sensitive temperature of the inlet end of the heat exchange tubes. Finally, measures of adopting post weld heat treatment and strengthening circulating cooling water treatment were proposed.

作為值得信賴的合作伙伴和高品質金屬合金的半成品供應商，通項公司擁有完善的服務體系和專業的團隊。在同客戶交易的過程中，我們力求根據不同的應用需求將我們的產品做到精益求精。針對當前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。

TXCO has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. TXCO develops the best alloy material solutions for current and future challenges.

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