S-Zorb再生器焊接修复技术研究  

N THE WELDING REPAIR TECHNOLOGY OF S-ZORB REGENERATOR

作　　者：梁斌 王郁林[2] 崔强 Liang Bin;Wang Yulin;Cui Qiang(Nanjing Boiler and Pressure Vessel Inspection Institute,Nanjing,Jiangsu,210019;SINOPEC Jinling Company,Nanjing,Jiangsu,210033)

机构地区：[1]南京市锅炉压力容器检验研究院,江苏南京210019 [2]中国石油化工股份有限公司金陵分公司,江苏南京210033

出　　处：《石油化工设备技术》2022年第2期31-36,I0002,共7页Petrochemical Equipment Technology

基　　金：中石化技术开发项目31700000-15-ZC0613-0020。

摘　　要：针对使用近2年且超温运行的S-Zorb再生器,通过力学性能试验、金相组织分析和模拟焊后热处理试验,研究其主体材料14Cr1MoR(H)的劣化状况,并开发焊接修复工艺。结果表明:母材常温下屈服强度和断后伸长率分别下降40%和15%,焊缝热影响区冲击韧性下降约30%,材料存在一定程度的劣化,但其金相组织状态正常,韧脆转变温度仍然远低于设备的最低金属设计温度。进行(690±14)℃保温20 h和保温4 h两种模拟焊后热处理后,母材常温抗拉强度和高温屈服强度最大下降幅度分别为15%和21%,冲击韧性下降55%;焊缝常温抗拉强度和高温屈服强度最大下降幅度分别为11%和4.7%,冲击韧性下降31%;金相组织中碳化物析出相明显增加且颗粒粗化;但母材常温屈服强度和塑性得到一定的恢复,韧脆转变温度变化不大,材料性能仍然满足设备技术条件要求。在此基础上开发了焊接修复工艺并应用于再生器,投用一个周期(3年),设备运行正常。For the S-Zorb regenerator,which has been in use for nearly 2 years and operating at over temperature,the deterioration of its main material 14Cr1MoR(H)is studied through mechanical property test,metallurgical structure analysis and simulated post-weld heat treatment tests,and the welding repair process was developed.The results show that the yield strength and elongation after fracture of the base metal decreased by 40%and 15%respectively at normal temperature,and the impact toughness in the heat-affected zone of the weld decreased by about 30%.There was a certain degree of material deterioration,but the metallographic structure of the material was normal and the ductile-brittle transition temperature was still far lower than the minimum metal design temperature of the equipment.After holding at(690±14)℃for 20 h and 4 h,the maximum decrease in the normal temperature tensile strength and high temperature yield strength of the base material was 15%and 21%respectively,and the impact toughness decreased by 55%.The maximum decrease in the normal temperature tensile strength and high temperature yield strength of the weld was 11%and 4.7%respectively,and the impact toughness decreased by 31%.In the metallographic structure,the carbide precipitates increased obviously and the particles became coarser.However,the yield strength and plasticity of the base metal at normal temperature were restored to a certain extent.The ductile-brittle transition temperature had little change.The material properties still met the technical requirements of the equipment.On this basis,the welding repair process was developed and applied to the regenerator.The equipment was put into operation for one cycle(3 years)and was in normal operation.

关 键 词：S-Zorb再生器 14Cr1MoR(H) 超温运行 材质劣化 焊接修复 

分 类 号：TG1[金属学及工艺—金属学]