Abstract: Microstructure and properties of 14Cr1MoR hot rolled steel plate with 60 mm thickness after normalizing+tempering, and simulated post-weld heat treatment were studied by using optical microscope, scanning electron microscope, tensile and impact testing machine. The results show that compared the steel plate of one-stage controlled rolling with that of two-stage controlled rolling, when the final rolling temperature is high and the cooling rate after rolling is slow, the ferrite grain size is coarser and the pearlite content is higher; the steel plate has lower strength, higher elongation, and lower impact value. After simulated post-weld heat treatment at 655 ℃ for 3 h, the yield strength and tensile strength of the two-stage controlled rolling steel plate decrease by 44 MPa and 24 MPa, respectively, and the impact absorbed energy decreases. When the simulated holding time is extended to 12 h, the strength and impact properties do not change much. The two-stage controlled rolling 14CrMoR steel plate has good mechanical properties after normalizing+tempering+simulated post-weld heat treatment at 655 ℃.

Key words: controlled rolling process, 14Cr1MoR steel plate, microstructure, properties, simulated post-weld heat treatment