采用Gleeble-3800热模拟试验机研究了1.25Cr-0.5Mo气保焊丝钢的连续冷却相转变行为（CCT），并在沙钢高线车间进行了该焊丝钢盘条的工业试制。试验结果表明：试样在950和1000℃2种变形温度下均得到铁素体（F）和马氏体（M）两相组织，且随变形温度和冷速降低，马氏体含量降低且尺寸减小；现场试制时设定精轧温度为950℃，吐丝温度为870～890℃，冷却速率为0.3~0.5℃/s，则制得的盘条组织为F+M，强度低于830 MPa，其拉拔深加工时制丝顺畅，未发生断丝。
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 roll-ing schedule at industrial facilities showed that a combination of finishing rolling temperature at 950℃, the spinning tem-perature at 870-890℃and the cooling rate at 0.3-0.5℃/s produced a welding wire with a microstructure of F+M and ten-sile strength below 830 MPa. Fracture of wire doesn’t occur during the drawing process which was smooth.
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