廠傢分析不銹鋼冷凝器泄漏原因分析

不銹鋼冷凝器泄漏原因分析，在使用不銹鋼冷凝器時，難免會出現泄漏的情況，那麼不銹鋼冷凝器出現泄漏的原因有哪些呢，接下來我們就對不銹鋼冷凝器泄漏原因進行分析，希望對用戶朋友的使用有幫助。一、外觀檢查.經盛水試漏檢查，發現在接管與殼體連接處有泄漏點，經細致觀察，在焊縫部位有明顯的微小細裂紋。
Analysis of leakage causes of stainless steel condenser, when using stainless steel condenser, it is inevitable that leakage will occur. Then what are the reasons for leakage of stainless steel condenser? Next, we will analyze the leakage reasons of stainless steel condenser, hoping to be helpful to users'friends. 1. Appearance inspection. After water leak test, it is found that there are leak points at the joint of nozzle and shell. After careful observation, there are obvious tiny cracks in the weld. 二、斷口宏觀檢查
2. Macroscopic examination of fracture surface
觀察殼體開裂部位發現，殼體中裂紋位於與接管焊接近焊縫區，呈現鋸齒狀形貌特征。
It is found that the cracks 透水地坪in the shell are located near the welding seam of the nozzle, showing a zigzag morphology.
三、化學成分檢查
III. Check of Chemical Constituents
對殼體和接管取樣進行化學成分分析，殼體化學成分符合GB/T4237—2007標準，接管化學成分符合GB/T14976—2012標準，數據符合標準要求。
The chemical composition of the shell and nozzle samples were analyzed. The chemical composition of the shell met the GB/T4237-2007 standard, the chemical composition of the nozzle met the GB/T14976-2012 standard, and the data met the standard requirements.
四、金相檢測
IV. Metallographic Detection
在殼體開裂部位截取試塊制備金相試樣，試樣先在未腐蝕情況下進行顯微鏡組織觀察，殼體試塊中非金屬夾雜物的級別，按GB/T10561—2005標準評定為C1.5及D1.5級，夾雜物的級別比較低。進一步觀察可發現，裂紋自殼體表面以沿晶的方式向內部擴展，裂紋整體表現為網狀，結合裂紋出現在近焊縫區位置，應屬焊接熱影響區，故此裂紋為焊接熱裂紋中的結晶裂紋。
Metallographic specimens were prepared by intercepting specimens from cracked parts of the shell. Microstructure of the specimens was observed without corrosion. The grade of non-metallic inclusions in the shell specimens was evaluated as C1.5 and D1.5 according to GB/T10561-2005 standard, and the grade of inclusions was relatively low. Further observation shows that the crack propagates from the shell surface to the interior in a transgranular manner, and the crack appears as a net shape as a whole. Combined with the crack appearing near the weld zone, it should belong to the welding heat affected zone, so the crack is the crystalline crack in the welding hot crack.
再經王水侵蝕後，發現殼體基體組織為奧氏體+少量碳化物。繼續觀察可發現，裂紋起始於焊縫的熱影響區，黑色部分是晶體脫落的地方；且在晶粒脫落附近及在晶界處可見有黑色的碳化物析出。
After erosion by aqua regia, it was found that the structure of shell matrix was austenite + a small amount of carbide. Further observation showed that the crack originated in the heat-affected zone of the w印花地坪eld, and the black part was where the crystals fell off, and black carbides precipitated near the grain shedding and at the grain boundary.
五、硬度檢測
Hardness Testing
在殼體裂紋部位截取硬度試塊，檢測4點，有3點大於標準值210HV。
The hardness test pieces were intercepted at the crack position of the shell. Four points were detected, and three points were greater than the standard value of 210HV.
綜合上述分析，殼體與接管焊接過程中，緊鄰殼體的熱影響區，溫度為500~850℃，形成焊接敏化區，同時殼體鋼板硬度值超標，固溶處理效果欠佳，未全部固溶與奧氏體中的碳也增加形成焊接敏化的傾向，兩者的共同作用使殼體產生晶間腐蝕開裂，故而造成開裂泄漏。
According to the above analysis, in the process of shell and nozzle welding, the heat affected zone adjacent to the shell, the temperature is 500-850 C, forming a welding sensitization zone. At the same time, the hardness value of shell steel plate exceeds the standard, the effect of solution treatment is not good, the carbon in austenite and not all solid solution also increase the tendency of welding sensitization. The joint action of the two causes intergranular corrosion cracking of the shell, which results in cracking and leakage. 。
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