面向高炉风口小套长寿化的表面堆焊工艺

Surface Overlaying Welding for Longe-service Sleeve of Blast Furnace Tuyere

针对高炉风口小套的使用情况和主要失效形式,提出了在风口内壁采用电弧熔覆高温耐磨合金材料的工艺方法。提出了过渡层JSTNi6382+表层耐磨合金的材料结构,并对熔覆层的金相组织、硬度、耐磨性和抗热震性能进行分析。沿熔积方向对强化试样进行等距硬度测试。试验结果表明,试样硬度沿熔积方向呈梯度递增。在常温下D450的耐磨性是紫铜的5.8倍,D600的耐磨性是紫铜的17倍;D450试样的抗热震性能远优于等离子喷涂工艺。

Aiming at the actual use of sleeve for blast furnace tuyere and the main failure mode in use,the methods were put forward for adopting the high temperature resistant alloy in the inner wall by arc deposition process and plasma spraying process of high-temperature ceramic materials in the outlet wall.By proposing the material of the transition layer as JSTNi6382 and the surface as D450,the microstructure,micro-hardness,wear resistance and thermal shock resistance of the cladding layer were analyzed.The micro-hardness was measured along the deposition direction of strengthening equidistant samples.The results reveal that the micro-hardness of the sample along deposition direction exhibits gradient increase.The wear tests show that the wear resistance of D450 is 5.8times of copper and D600 is 17times of copper at room temperature.Experimental results show that the thermal shocking resistance of the sample by HDMR process is far superior to that of one by plasma spraying.