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某公司为吉林奇峰化纤有限公司年产4×104t差别化腈纶技术改造项目承接制造一台醋酸去除塔再沸器。该设备由管箱、壳体和管束等部分构成,管程的介质为DMAC+AA(二甲基乙酰氨+醋酸)具有较强的腐蚀性,为此,选用了904L超低碳高铬镍奥氏体不锈钢板,该钢种属高合金钢,焊接工艺性较差,焊接热裂纹、晶间腐蚀、应力腐蚀开裂问题非常严重,特别是弧坑裂纹难以控制。从热裂纹、晶间腐蚀、应力腐蚀开裂的产生原理出发,对该钢种的可焊性进行分析,并对工艺性试验试板解剖,进行金相观察和机械性能检验,从而找出了合适的焊接规范。
A company for Jilin Qifeng Chemical Fiber Co., Ltd. with an annual output of 4 × 104t differential acrylic technology transformation project to undertake the manufacture of an acetic acid removal tower reboiler. The equipment is composed of a tube box, a shell and a bundle of tubes. The medium of the tube is DMAC + AA (dimethylacetamide + acetic acid), which has strong corrosiveness. For this reason, the 904L ultra-low carbon high- The body of stainless steel, the steel is a high alloy steel, poor welding technology, welding hot cracking, intergranular corrosion, stress corrosion cracking is very serious, especially crater crack difficult to control. Based on the principle of hot crack, intergranular corrosion and stress corrosion cracking, the weldability of this kind of steel was analyzed. The test plate of the craft test was dissected, and the metallographic observation and mechanical property test were conducted to find the suitable The welding specifications.