在线淬火工艺在韶钢3450mm炉卷轧机的开发及应用  

Development and application of online direct quenching on the 3450 mm steckel mill at SISG

作　　者：齐亮 刘年富 何春雨[2] 余伟[2] 

机构地区：[1]广东省韶关钢铁集团有限公司,广东韶关512123 [2]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《南方金属》2011年第2期38-41,47,共5页Southern Metals

摘　　要：通过分析韶钢宽板轧机生产线控制冷却系统存在的一些问题,对宽板轧机的控制冷却系统进行了系统的改造和完善,利用在线淬火工艺及离线回火热处理技术成功开发了Q550D高强钢.实践效果表明:在线淬火工艺确保了钢板在较低终冷温度、较高的冷却速率下仍能获得良好的板形,经离线回火处理后保证了Q550D获得回火贝氏体组织+少量针状铁素体+少量第二相的复合组织,力学性能完全满足客户的要求,而且保证了钢板长度和厚度方向、组织性能的均匀性.： In view of the problems associated with the laminar cooling system for the steckel mill of SISG, a systematic re- formation project of the cooling system was undertaken. A Q550D grade high strength steel was successfully developed by employing online direct quenching plus off-line tempering. It was demonstrated that the online quenching ensured a good plate shape, even though the final cooling temperature was lowered, and the cooling rate was increased by the direct quench- ing process. The online quenching plus offline tempering provided the steel with a composite microstructure composed of tempered bainite plus a small amount of acicular ferrite and carbide/nitride precipitates. Being uniform along the length and thickness of the plate, the mechanical properties of the steel so heat treated well met the requirements of customers.

关 键 词：宽板轧机 控制冷却 在线淬火 高强度钢 

分 类 号：TG335.5[金属学及工艺—金属压力加工]