Abstract：The continuous cooling transformation (CCT) kinetics in the designed thermo mechanical processing conditions was investigated for 1.25Cr-0.5Mo steel employing a Gleeble-3800 thermo mechanical simulator, and plant trial of the wire rod was conducted in the high speed wire rod production line. The CCT experimental results suggest that the sample under deformation temperatures of both 950 and 1 000 ℃ both produced a microstructure of ferrite (F) and martensite (M), and the fraction and size of M decreased with the deformation temperature and cooling rate. The optimization of rolling schedule at industrial facilities showed that a combination of finishing rolling temperature at 950 ℃, the spinning temperature at 870-890 ℃ and the cooling rate at 0.3-0.5 ℃/s produced a welding wire with a microstructure of F+M and tensile strength below 830 MPa. Fracture of wire doesn’t occur during the drawing process which was smooth.
E. J. Pavlina, C. J. Van Tyne. Correlation of Yield Strength and Tensile Strength with Hardness for Steels[J]. Journal of Materials Engineering and Performance, 2008,17(6): 888-893.
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E. J. Pavlina, C. J. Van Tyne. Correlation of Yield Strength and Tensile Strength with Hardness for Steels[J]. Journal of Materials Engineering and Performance, 2008,17(6): 888-893.
2014, Vol. 49 
