Failure Analysis on Header Connecting Piping 12Cr1MoV of Power Plant Boiler
Failure reason of 12Cr1MoV header connecting piping in coal power was analyzed by optical microscope and scanning electronic microscope.The results show that the chemical composition and mechanical properties meet standards,but pearlite spheroidizes and carbide precipitates on the grain boundary.Creep holes appearing in certain areas near the fracture induce a great number of cracks,even leads to burst on the elbow of pipe.The parameters should be controlled in order to avoid the excessive atmospheric pressure.