0Cr18Ni9不銹鋼換熱管應(yīng)力腐蝕開裂原因分析

0Cr18Ni9不銹鋼換熱管應(yīng)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(fā)生開裂。通過宏觀分析、化學(xué)成分分析、水質(zhì)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(jié)果表明：該換熱管開裂為應(yīng)力腐蝕開裂；循環(huán)冷卻水中較高含量的氯離子以及換熱管進口端處于應(yīng)力腐蝕敏感溫度區(qū)導(dǎo)致了應(yīng)力腐蝕的快速發(fā)展。最后，給出了進行焊后熱處理和加強循環(huán)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.

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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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