Basic Research on Welding Test and Application of 1000MPa High Strength Steel for Hydropower
The development and application of 1000MPa high-strength steel and supporting welding technology for hydropower in foreign countries started earlier and around 2000,the application of 1000MPa high-strength steel in key pressure bearing components such as pressure steel pipes and steel bifurcations in the water intake system of high head pumped storage power stations was achieved,forming a complete industrial chain of high-strength steel plates,supporting welding materials,and complete welding technology.At present,the HD value of high head power stations developed in China(an important parameter that characterizes the scale and technical difficulty of pressure steel pipes)has approached or even exceeded the hydropower projects that have already applied 1000MPa high-strength steel abroad.However,there have been no successful cases of hydropower projects in China that have applied 1000MPa high-strength steel and put it into operation.Therefore,with the construction of high head and large capacity impact and pumped storage power stations in China,it is urgent to achieve independent research and application of 1000MPa high-strength steel.Through this experimental study,key technologies such as comprehensive quantitative evaluation method for weldability of domestic 1000MPa high-strength steel for hydropower and efficient and high-quality welding process control have been mastered.The developed supporting welding technology performs well in key performance indicators such as low-temperature impact toughness,stability,and sensitivity to cold and hot cracks.The reliability of steel plates,welding materials,and welding processes has been verified through welding repair tests,welding model hydrostatic tests,and stress analysis,which can meet the welding requirements of 1000MPa high-strength steel for hydropower.The research results of this experiment can provide technical support for the engineering application of 1000MPa high-strength steel and supporting welding technology.
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维普
