Analysis for fracture toughness of 2205 duplex stainless steel pipe

作者：Li Wei wei^*

来源：9th International Conference on Engineering Structural Integrity Assessment, 2007-10-15 to 2007-10-19.

Being a relatively new type of material to most people, 2205 duplex stainless steel (DSS) posses favorable mechanical property and good corrosion resistance at the same time, and applied wildly in transport, oil and natural gas, ocean and chemistry industry, etc. One natural gas headstream project maximum operation pressure is 13.3MPa and minimum operation temperature is at -30 degrees C, and so put forward very high toughness requirements for the pipe. The Charpy-V Notch Impact Toughness(CVN) test, Drop-weight Tear Test(DWTT) and Crack-tip Opening Displacement (CTOD) test of 2205 duplex stainless steel pipe used for the high pressure nature gas transmission has been done, the fracture toughness has been investigated. The results show that this pipe material has very high Charpy impact absorbed energy, very low ductility to brittleness translation temperature (FATT) and very high CTOD value, that is said this pipe material has good fracture toughness and good safety performance for high pressure natural gas pipeline.