Finishing rolling temperature of 16 mm plate of test steel 15CrMoV(%:0.15C

0.29Si

0.57Mn

  1.01Cr

0.37Mo

0.24V)was 900~950 ℃

then the rolled plate was direct-water-quenched at 880～900 ℃

and tempered at 670~800& ℃.Results showed that the structure of test steel after in-line quenching was martensite + bainite

with increasing tempering temperature

amount of precipitated carbides increased

and bainite lath was gradually merged and finally transferred to carbide + polygonal ferrite structure; with tempered at 730~780 ℃

the steel 15CrMoV had excellent comprehensive mechanical properties with tensile strength 680～760 MPa and impact energy 55～130 J.