轧后在线快冷生产热轧无缝管线钢管X52N实践

Practices on Producing Hot Rolled Seamless PipelineSteel Pipe X52N with On-line Accelerated Cooling after Rolling

热机械控轧控冷(TMCP)技术一直在无缝钢管领域应用困难,结合无缝钢管工艺流程开发轧后控制冷却设备,通过工业实践采用轧后在线快冷生产X52N无缝管线钢管,同时对其理化性能、组织进行了研究。实践表明,采用C-Mn钢生产无需加入成本高昂的合金元素,通过轧后在线快冷调控材料的微观组织,保证材料的各项力学性能满足标准要求,无需后续离线热处理,满足长距输送管线钢管X52N的理化性能要求,实现低成本、短流程、经济性生产。

The thermos mechanical control process(TMCP)has been difficult to apply in the field of seamless steel pipe.The control cooling equipment after rolling is developed combining with process flow of seamless steel pipe,the X52N seamless pipeline steel pipe is produced with on-line accelerated cooling after rolling through industrial practices as well as its physical and chemical properties and microstructure are studied.The practices showed that the costly alloy elements did not need to be added into the production with C-Mn steel,microstructure of material was regulated and controlled by on-line accelerated cooling after rolling so as to ensure mechanical properties of material to meet the standard requirements as well as follow-up offline heat treatment was not needed.As a result,the requirements of physical and chemical properties for long distance pipeline steel pipe X52N could be met so that low cost,short process and economic production are realized.