摘要
研究了化学成分和生产工艺参数对钢管在线加速冷却后组织、性能的影响。结果表明,材料经过穿孔工序或连轧工序后,为奥氏体完全动态再结晶组织;经过张减工序后,为加工硬化状态的奥氏体组织。采用轧后余热和水气复合冷却方式对钢管外表面加速冷却,可以保证钢管轴向、周向、径向3个方向上的强度和硬度均匀性。采用25MnVN或25MnMoVN之类微合金钢,经过轧后加速冷却,可以不经过调质热处理,生产出性能完全满足要求的N80钢级石油套管。
The effect of chemical composition and process parameters on the microstructure and mechanical properties of steel pipes under accelerated-cooling conditions is investigated. The results show that after the piercing or mandrel milling process, the steel for pipes will become a complete dynamic austenite recrystallization microstructure. After stretching and reducing processes, it will become an austenite structure in the work-hardened state. Cooling steel pipe＇ s surface in a compound cooling way of utilizing residual heat and water vapor may guarantee the pipe ＇ s uniformity of strength and hardness in longitudinal, radial and circumferential directions. Microalloyed steels like 25MnVN or 25MnMoVN can be made into N80 grade casing pipes under accelerated-cooling conditions after being rolled, without quenching-tempering treatment.
出处
《宝钢技术》
CAS
2006年第3期1-4,38,共5页
Baosteel Technology
