T91钢Φ110 mm管坯穿孔工艺生产实践

Practice of T91 Steel Φ110 mm Billet Piercing Process

针对T91钢Φ110 mm管坯热轧穿孔过程中顶头消耗高、连接接头脱丝或断裂及产品出现内折缺陷的问题,提出改进措施。分析认为:通过制定合理的加热制度,改进钼基顶头及连接接头结构,规范钼基顶头操作使用,可实现稳定生产,每个顶头平均穿孔支数达到363支,小时平均穿孔支数达67支左右,成本大幅下降。

Addressing the problems related to the piercing process of T91 steel Φ110 mm billets such as high consumption of plugs, loosing or breaking of plug connections, as well as the inner folds on pierced products, some countermeasures are proposed. It is indicated that by establishing a reasonable heating schedule, improving the structure of the molybdenum based plugs and connections, and standardizing the operation of the plugs, a stable piercing process with significantly lowerd cost can be realized when each plug may averagely pierce 363 billets in total and 67 billets per hour.