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对甲醇一氧化碳变换管道焊缝裂纹进行宏观和微观分析,对裂纹内腐蚀产物进行X射线分析,认为SUS304厚壁型不锈钢管道在焊接过程中焊缝区域极易产生微裂纹、敏化等缺陷,这是厚壁型不锈钢管道发生应力腐蚀开裂的重要内因;高温下含高水分、适量氧气、微量氯离子的水煤气介质是不锈钢管道产生应力腐蚀开裂的重要外因;而由于温差变动造成的热应力是管件疲劳开裂的另一个重要外因。采用铬钼低合金钢管道输送高温水煤气是适宜有效的,但其耐均匀腐蚀性较差,生产过程中宜加强监测,以确保安全。
Methanol carbon monoxide shift pipe weld crack macro and micro analysis, the crack corrosion products X-ray analysis, that the SUS304 thick-walled stainless steel pipe in the welding process prone to micro-cracks, sensitization and other defects, which It is an important internal cause of stress corrosion cracking in thick-walled stainless steel pipe. Water gas medium containing high moisture, moderate amount of oxygen and trace chloride ion is an important external cause of stress corrosion cracking in stainless steel pipe under high temperature. The thermal stress caused by temperature difference is pipe Another important external cause of fatigue cracking. Chromium molybdenum low alloy steel pipe conveying high temperature water gas is appropriate and effective, but its resistance to uniform corrosion is poor, the production process should strengthen monitoring to ensure safety.