Microstructure and Mechanical Properties of a Super 13Cr Tubing Steel

The microstructure and mechanical properties of the super 13Cr tubing steel after quenching and tempering treatment and high temperature annealing after straightening were analyzed. The results show that the microstructure of the super 13Cr tubing steel was lath martensite+small amount of long δ ferrite, and the grain size was grade 9. With the test temperature increasing from -90 ℃ to 100 ℃, the impact absorption energy of the super 13Cr tubing steel increased, and the impact absorption energy can reach 158 J at -90 ℃. At room temperature, the yield strength of the super 13Cr tubing steel was 823 MPa, the tensile strength was 936 MPa, and the hardness was 29. 4 HRC, all of which met the technical requirements. The fatigue strength of super 13Cr tubing steel was 550 MPa.