一种低合金耐热焊丝钢盘条的研制.pdf

第49 卷 第 10 期 钢 铁 Vol.49 ，No. 10 2 0 1 4 年 10 月 Iron and Steel October 2014 DOI ：10.13228/j.boyuan.issn0449-749X 一种低合金耐热焊丝钢盘条的研制 郭慧英， 张 宇， 许红梅， 王银柏 (江苏省(沙钢)钢铁研究院，江苏 张家港 215625) 摘 要：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1 000 ℃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。 关键词：耐热气保焊丝钢；连续冷却相转变；马氏体；斯太尔摩冷却线 文献标志码：A 文章编号：0449-749X （2014 ）10-0066-05 Development of Low Alloy Heat Resisting Welding Wire GUO Hui-ying, ZHANG Yu, XU Hong-mei, WANG Yin-bai (Institute of Research of Iron and Steel of Shasteel, Zhangjiagang 215625, Jiangsu, China) 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 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. Fractur