Analysis of High-temperature Boiler Tube Failure for T91 &T22
来源期刊：材料热处理学报2004年第5期
论文作者：DING Hui ZHAO Ling-song SHU Guo-gang ZHAO Yan-fen ZHANG Lu XUE Fei
关键词：superheater; tube failure; material examination; short-term overheated;
摘 要：The tube failures took place frequently in the superheater of 2x600MW units in a power plant. According to the condition of tube failures, the mechanical property and microstructure on running and failed tubes were tested and evaluated. The chemical composition and structure phase of inner oxide scale and deposit inside of the tubes were examined.The fractured surfaces of failed tube samples were observed. And the material examination was performed for original tube steels SA213-T91 and SA213-T22. The results show that raw materials of SA213-T91 and SA213-T22 tube in superheater are qualified. Besides, the characteristics of the SA213-T91 and SA213-T22 tube failure are typical short-term overheated rupture. The rupture temperature is located between two phase Ac1 ～ Ac3 of the two steels. It is recognized that putting SA213-T22 tubes in operation under the condition of long-term over heating causes the rupture of SA213-T91 and SA213-T22.
WANG Zheng-pin1，DING Hui2，LIU Jiang-nan1，ZHAO Ling-song3，SHU Guo-gang2，ZHAO Yan-fen3，ZHANG Lu3，XUE Fei3
(1.Xi'an Institute of Technology, Xi'an, Shanxi;
2.Wuhan University, Wuhan, Hubei;
3.Suzhou Nuclear Power Research Institute, Suzhou,Jiangsu)
摘要:The tube failures took place frequently in the superheater of 2x600MW units in a power plant. According to the condition of tube failures, the mechanical property and microstructure on running and failed tubes were tested and evaluated. The chemical composition and structure phase of inner oxide scale and deposit inside of the tubes were examined.The fractured surfaces of failed tube samples were observed. And the material examination was performed for original tube steels SA213-T91 and SA213-T22. The results show that raw materials of SA213-T91 and SA213-T22 tube in superheater are qualified. Besides, the characteristics of the SA213-T91 and SA213-T22 tube failure are typical short-term overheated rupture. The rupture temperature is located between two phase Ac1 ～ Ac3 of the two steels. It is recognized that putting SA213-T22 tubes in operation under the condition of long-term over heating causes the rupture of SA213-T91 and SA213-T22.
关键词:superheater; tube failure; material examination; short-term overheated;
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