中文摘要：

步进式加热炉因其突出优点近年来在同内轧钢工业得到迅速发展。设计钢坯准确测量定位系统，实现炉内合理布钢，保证固定梁、步进梁对钢坯的均衡支撑至关重要。在分析临沂某钢铁集团棒材轧线步进式加热炉结构的基础上，采用S7—400CPU、FM350—2计数模块、MM440变频器、光电编码器及冷金属探测器等设备，实现了6m、9m、12m钢坯在炉内的准确分布定位控制。调试及运行情况表明，定位系统运行稳定可靠，满足生产要求。

英文摘要：

With outstanding advantages, walking beam reheat furnace has achieved rap development in the domestic steel rolling industry. Designing accurate positional system and achieving reasonable steel layout, which make sure the fixed and walking beam sustain billets equally are essential. Based on the analysis of furnace structure, S7-400CPU, counter model FM350-2, MM440 inverter, photoelectric encoder, cold metal detectors and other devices being used, 6 m, 9 m, 12 m billet accurately positional and reasonably laid control system was achieved. Commissioning operation shows that, positional system is stable and reliable, and meets the production requirements.