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分析得到了不锈钢光亮退火机组马弗管在高温自重长期服役条件下缺陷的形式及相应的原因。马弗管在高温自重作用下易产生缩颈、厚度减薄、截面变形、龟裂、橡胶状弯曲、鼓包、烧穿、焊缝开裂、渣滓、高温腐蚀坑等缺陷。高温蠕变是除焊缝开裂、渣滓、高温腐蚀坑外多种缺陷产生的直接或间接原因,设计、制造、使用工艺不当是引起诸如焊缝开裂、烧穿缺陷等的重要原因。针对各种缺陷特点,制定了合理修复技术方案,现场应用表明修复工艺方案是切实可行的,从而保证了马弗炉的正常使用。
The defects of the stainless steel bright annealing unit Muffle tube under long-term service under high temperature and heavy weight were analyzed and the corresponding causes were obtained. Under the action of high temperature and heavy weight, muffle pipe is easy to produce constriction, thinning, deformation of section, cracking, rubbery bending, bulging, burning through, weld cracking, scum, corrosion pit at high temperature and other defects. High temperature creep is a direct or indirect cause of many kinds of defects except cracking, dross and high temperature corrosion pits. Improper design, manufacture and use of improper technology are the important reasons that cause such as weld cracking and burn-through defects. According to the characteristics of various defects, a reasonable repair technical scheme has been worked out, and the field application shows that it is practicable to repair the technological scheme so as to ensure the normal use of the muffle furnace.