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冷挤压钢在挤压前必须进行球化预处理 ,选择合适的球化工艺 ,可以获得良好的球化组织。根据德国的球化标准图谱 ,用面积百分比法评出国产和进口的三种材料在经过球化处理后的球化级别。
Cold extrusion of steel before extrusion must be ball pretreatment, select the appropriate ball technology, you can get a good ball organization. According to Germany’s nodularity standard map, the area percentage method was used to evaluate the nodulizing levels of domestic and imported materials after spheroidization.