Analysis of Hardness Reduction on Outer Arc Side of P91 Bend Pipe
This paper introduces the hardness reduction of the outer elbow of P91 steel pipe after cold bending and tempering.Combining with bending test,hardness test and metallographic analysis,it is suggested that the hardness value of the outer elbow of P91 steel pipe with small cold bending deformation is generally relatively stable after tempering at 780 ℃,and the metallographic structure only recovers.When the cold bending deformation of P91 is large,the microstructure of the outside of the bending tube recrystallizes,and the hardness decreases rapidly.
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