Effect of different solution treatment temperature on microstructure and property of cold bending TP347H steel tube is studied by microscopic test

scanning electron microscopy test

hardness test

DL-EPR test and other methods.The results show that there are a lot of slip lines in the intragranular of TP347H tube after cold bending deformation.The hardness exceeds the standard permission level and resistance to intergranular corrosion is reduced.After solution treatment

slip line and second-phase is reduced and the hardness is decreased.The influence of solution treatment temperature on the resistance to intergranular corrosion of elbow tube is significant.From 1 050 ℃ to 1 150 ℃

resistance to intergranular corrosion of elbow tube become strong first.It reach the peak at 1 100 ℃

then it becomes weak gradually.The best solution treatment temperature of TP347H steel tube is 1 100 ℃.