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    厂家分析不锈钢冷凝器泄漏原因分析

    2018-12-28 14:43:09 无锡盛发地坪科技有限公司 阅读

    不锈钢冷凝器泄漏原因分析,在使用不锈钢冷凝器时,难免会出现泄漏的情况,那么不锈钢冷凝器出现泄漏的原因有哪些呢,接下来我们就对不锈钢冷凝器泄漏原因进行分析,希望对用户朋友的使用有帮助。一、外观检查.经盛水试漏检查,发现在接管与壳体连接处有泄漏点,经细致观察,在焊缝部位有明显的微小细裂纹。

    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、断口宏观检查

    2. Macroscopic examination of fracture surface

    观察壳体开裂部位发现,壳体中裂纹位于与接管焊接近焊缝区,呈现锯齿状形貌特征。

    It is found that the cracks in the shell are located near the welding seam of the nozzle, showing a zigzag morphology.

    三、化学成分检查

    III. Check of Chemical Constituents

    对壳体和接管取样进行化学成分分析,壳体化学成分符合GB/T4237—2007标准,接管化学成分符合GB/T14976—2012标准,数据符合标准要求。

    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、金相检测

    IV. Metallographic Detection

    在壳体开裂部位截取试块制备金相试样,试样先在未腐蚀情况下进行显微镜组织观察,壳体试块中非金属夹杂物的级别,按GB/T10561—2005标准评定为C1.5及D1.5级,夹杂物的级别比较低。进一步观察可发现,裂纹自壳体表面以沿晶的方式向内部扩展,裂纹整体表现为网状,结合裂纹出现在近焊缝区位置,应属焊接热影响区,故此裂纹为焊接热裂纹中的结晶裂纹。

    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.

    再经王水侵蚀后,发现壳体基体组织为奥氏体+少量碳化物。继续观察可发现,裂纹起始于焊缝的热影响区,黑色部分是晶体脱落的地方;且在晶粒脱落附近及在晶界处可见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 weld, and the black part was where the crystals fell off, and black carbides precipitated near the grain shedding and at the grain boundary.

    五、硬度检测

    Hardness Testing

    在壳体裂纹部位截取硬度试块,检测4点,有3点大于标准值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.

    综合上述分析,壳体与接管焊接过程中,紧邻壳体的热影响区,温度为500~850℃,形成焊接敏化区,同时壳体钢板硬度值超标,固溶处理效果欠佳,未全部固溶与奥氏体中的碳也增加形成焊接敏化的倾向,两者的共同作用使壳体产生晶间腐蚀开裂,故而造成开裂泄漏。

    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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