氨合成塔外壳用特厚电渣板的研制开发

针对氨合成塔外壳用钢单重、壁厚的大幅增加以及相应技术要求的日趋加严等难题，舞钢基于化工关键设备运行安全稳定高效的创新成分设计，并结合当前生产线的装备水平，创造性地采用电渣生产工艺成功开发出大型氨合成塔外壳用特厚电渣板。结果表明，钢质纯净、成分均匀、组织致密细小，同时具有碳当量低、优良的室温、高温拉伸性能和良好的负温冲击性能，内外在质量优异。钢板厚度达177 mm，成品单重37.9 t，厚度、单重国内第一，技术要求接近该类钢现阶段的极限水平，钢板替代进口，用于国内某化工项目中大型氨合成塔的设计与制造。

Research and development of extra thick electroslag #br# plate for ammonia converter shell

Aiming at the problems of the large increase of weight and thickness of shell steel for ammonia synthesis tower, as well as the increasingly stringent technical requirements, the extra thick electroslag plate for the shell of large ammonia synthesis tower was successfully developed in Wugang based on the safe, stable and efficient design of innovative components for the key chemical equipment operation and combined with the equipment level of current production line by creatively adopting electroslag production process. The results showed that the steel was pure, whose composition was homogeneous and structure was compact and fine, and had low carbon equivalent, excellent tensile properties at room temperature, high temperature and good impact properties at low temperature. The internal and external quality of steel was excellent. The thickness of the steel plate was 177 mm, the weight of the finished product was 37.9 t. The thickness and weight of steel plate were the only one in China. The technical requirement was close to the limit level of this kind of steel at the present stage. The steel plate was used for the design and manufacture of the large ammonia converter in a domestic chemical project instead of the imported steel plate.