高硬度耐磨抗裂堆焊焊条的研制

Developments of the Surfacing Electrode with the High Hardness, Wearability and Good Cracking Resistance

采用二次旋转回归设计的方法安排试验，建立了堆敷金属硬度（ＨＲＣ）和耐磨性与药皮合金剂间的数学模型，利用该数学模型研究了堆敷金属性能与合金剂间的相关性，并针对９Ｃｒ２Ｍｏ 等系列冷轧辊的修复需要，利用最优化技术研制出一种新型耐磨抗裂堆焊焊条。其堆敷金属的硬度ＨＲＣ≥６０，焊前不预热堆焊层不产生裂纹，具有良好的工艺性能。经试用，用该焊条修复９Ｃｒ２Ｍｏ 系列冷轧辊耐磨性好，抗剥落能力强，其使用寿命为原轧辊的１～２ 倍。

In this paper, a mathematical model, relating the hardness(HRC) and wearability of deposited metal with alloy agents in coating of surfacing electrodes, is built up by using the quadratic rotating-regression method. Based on the model, the relationship between the properties of deposited metal and alloy agents is investigated. Furthermore, by means of the optimizing technology, a new type of surfacing electrode, not only wear-resisting but also crack-resisting, is developed for the requirement of repairing 9Cr2Mo cold rollers. Technical performance of the electrode is good, no cracking happens in the deposited metal under the condition without preheat, and the hardness(HRC) is beyond 60. The practice shows that the 9Cr2Mo cold rollers repaired by the electrode are provided with good wearability and high peel off resistance, and the life time is 1～2 times long compared with that of original rollers.