中厚钢板正火后快速冷却工艺控制系统

Fast cooling process control system for medium and heavy plate after normalizing

正火后快速冷却是改善中厚钢板热处理组织性能的新技术,工艺控制是该技术的核心。本文建立了钢板正火后快速冷却多场耦合传热模型和换热系数模型、自动控制系统和系列高强均匀快冷技术,构建了工艺控制系统。工业应用结果表明:该系统实现了按工艺路径快冷,主要冷却参数控制误差<1%,终冷温度控制精度为±10℃,冷后板形不平度≤7 mm/2 m,冷后钢板组织、强度、冲击韧性等改善明显,满足了企业高品质、减量化热处理的需求。

Advanced fast cooling after normalizing is a new technology to improve microstructure and properties of medium plate after heat treatment, process control is the core of this technology. In this paper, plate fast cooling multi field coupling models and heat transfer coefficient models were constructed, and then, automatic control system and a series of high strength uniform fast cooling technologies were developed. Based on this, process control system was build up finally. The industrial application results show that this system realizes fast cooling according to the process path. The main cooling parameters control error is less than 1%, the final cooling temperature control precision is ± 10 ℃, and plate shape roughness after cooling is less than 7 mm/2 m. Moreover, plate microstructure, strength, impact toughness are improved obviously after cooling. The above results meet the demands of high quality and reduction heat treatment for steel plants.