Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service
Само за регистроване кориснике
2014
Аутори
Bakić, GordanaŠijački Žeravčić, Vera
Rajičić, Bratislav
Radović, Miladin
Gajić, Ivan
Maslarević, Aleksandar
Jakovljević, Aleksandar
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Heat resistant martensitic steel X20CrMoV121 (DIN) is extensively used in the last few decades as a material for tubing systems and pipelines in thermal power plants. Long term behaviour of this material is well known and understood. X20CrMoV121 is found to be reliable for prolonged service at elevated temperatures. Main disadvantage is poor weld-ability, apart from other properties of great importance for tubing systems. Failure of the tubing system during service requires quick replacement of damaged parts. In situ repair welding of martensitic steels is always problematic since it requires special welding techniques usually difficult to perform in short time during forced outages. Here we report on the repair welding procedure for the outlet superheater in two 600 MW lignite power plant units. The super heater is made of X20CrMoV121 (DIN). Outlet temperature and pressure in the super heater system are 540°C and 18.6 MPa. The local thinning of tube walls is found to be the main damag...e mechanism of the super heater during prolonged service. Highly erosive lignite combustion particles are identified as the main reason for wall thinning.
A serious problem is the long required period for repair welding of damaged martensitic X20CrMoV121 steel. The solution was cold welding involving repair welding by austenitic electrode with high nickel and chromium content. This technique has many advantages as short welding time, no need for special atmosphere and preheating treatment, relatively easy welding process, etc. Repaired joints are usually replaced during next overhaul, but for investigation purposes some are maintained in service over 10 years. Intensive characterization of base and filler material of repair welds after 10 years service is reported in this paper.
Кључне речи:
heat resistant martensitic steel / repair weldingИзвор:
Integritet i vek konstrukcija, 2014, 14, 2, 133-140Издавач:
- Belgrade : DIVK
Колекције
Институција/група
Inovacioni centarTY - JOUR AU - Bakić, Gordana AU - Šijački Žeravčić, Vera AU - Rajičić, Bratislav AU - Radović, Miladin AU - Gajić, Ivan AU - Maslarević, Aleksandar AU - Jakovljević, Aleksandar PY - 2014 UR - https://machinery.mas.bg.ac.rs/handle/123456789/4590 AB - Heat resistant martensitic steel X20CrMoV121 (DIN) is extensively used in the last few decades as a material for tubing systems and pipelines in thermal power plants. Long term behaviour of this material is well known and understood. X20CrMoV121 is found to be reliable for prolonged service at elevated temperatures. Main disadvantage is poor weld-ability, apart from other properties of great importance for tubing systems. Failure of the tubing system during service requires quick replacement of damaged parts. In situ repair welding of martensitic steels is always problematic since it requires special welding techniques usually difficult to perform in short time during forced outages. Here we report on the repair welding procedure for the outlet superheater in two 600 MW lignite power plant units. The super heater is made of X20CrMoV121 (DIN). Outlet temperature and pressure in the super heater system are 540°C and 18.6 MPa. The local thinning of tube walls is found to be the main damage mechanism of the super heater during prolonged service. Highly erosive lignite combustion particles are identified as the main reason for wall thinning. A serious problem is the long required period for repair welding of damaged martensitic X20CrMoV121 steel. The solution was cold welding involving repair welding by austenitic electrode with high nickel and chromium content. This technique has many advantages as short welding time, no need for special atmosphere and preheating treatment, relatively easy welding process, etc. Repaired joints are usually replaced during next overhaul, but for investigation purposes some are maintained in service over 10 years. Intensive characterization of base and filler material of repair welds after 10 years service is reported in this paper. PB - Belgrade : DIVK T2 - Integritet i vek konstrukcija T1 - Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service EP - 140 IS - 2 SP - 133 VL - 14 UR - https://hdl.handle.net/21.15107/rcub_machinery_4590 ER -
@article{ author = "Bakić, Gordana and Šijački Žeravčić, Vera and Rajičić, Bratislav and Radović, Miladin and Gajić, Ivan and Maslarević, Aleksandar and Jakovljević, Aleksandar", year = "2014", abstract = "Heat resistant martensitic steel X20CrMoV121 (DIN) is extensively used in the last few decades as a material for tubing systems and pipelines in thermal power plants. Long term behaviour of this material is well known and understood. X20CrMoV121 is found to be reliable for prolonged service at elevated temperatures. Main disadvantage is poor weld-ability, apart from other properties of great importance for tubing systems. Failure of the tubing system during service requires quick replacement of damaged parts. In situ repair welding of martensitic steels is always problematic since it requires special welding techniques usually difficult to perform in short time during forced outages. Here we report on the repair welding procedure for the outlet superheater in two 600 MW lignite power plant units. The super heater is made of X20CrMoV121 (DIN). Outlet temperature and pressure in the super heater system are 540°C and 18.6 MPa. The local thinning of tube walls is found to be the main damage mechanism of the super heater during prolonged service. Highly erosive lignite combustion particles are identified as the main reason for wall thinning. A serious problem is the long required period for repair welding of damaged martensitic X20CrMoV121 steel. The solution was cold welding involving repair welding by austenitic electrode with high nickel and chromium content. This technique has many advantages as short welding time, no need for special atmosphere and preheating treatment, relatively easy welding process, etc. Repaired joints are usually replaced during next overhaul, but for investigation purposes some are maintained in service over 10 years. Intensive characterization of base and filler material of repair welds after 10 years service is reported in this paper.", publisher = "Belgrade : DIVK", journal = "Integritet i vek konstrukcija", title = "Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service", pages = "140-133", number = "2", volume = "14", url = "https://hdl.handle.net/21.15107/rcub_machinery_4590" }
Bakić, G., Šijački Žeravčić, V., Rajičić, B., Radović, M., Gajić, I., Maslarević, A.,& Jakovljević, A.. (2014). Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service. in Integritet i vek konstrukcija Belgrade : DIVK., 14(2), 133-140. https://hdl.handle.net/21.15107/rcub_machinery_4590
Bakić G, Šijački Žeravčić V, Rajičić B, Radović M, Gajić I, Maslarević A, Jakovljević A. Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service. in Integritet i vek konstrukcija. 2014;14(2):133-140. https://hdl.handle.net/21.15107/rcub_machinery_4590 .
Bakić, Gordana, Šijački Žeravčić, Vera, Rajičić, Bratislav, Radović, Miladin, Gajić, Ivan, Maslarević, Aleksandar, Jakovljević, Aleksandar, "Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service" in Integritet i vek konstrukcija, 14, no. 2 (2014):133-140, https://hdl.handle.net/21.15107/rcub_machinery_4590 .