Development of HRSG-purposed Extra-long/Light-wall Steel Pipe as Hot-rolled with CPE Push Bench Mill
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摘要: 根据CPE顶管机组的特点，介绍了热轧HRSG用超长薄壁管的生产工艺流程及技术控制难点，并从壁厚均匀性与拉凹缺陷控制、内表面质量、性能控制等方面提出具体的解决方案。实践证明：通过优化变形分配、顶管孔型，控制芯棒尺寸及其温度，可有效减少拉断事故的发生，并控制拉凹缺陷的产生，实现顶管轧制3.0～3.3 mm壁厚HRSG用薄壁管的稳定生产；通过除鳞后、张力减径前的中频补热及张力减径后的冷却速率控制，可稳定地控制热轧小直径HRSG用超长薄壁管的性能。Abstract: Described on the basis of characteristics of the CPE push bench mill are the manufacturing process flow and the technical control-related difficulties for the hot-rolled HRSG-purposed extra-long/light-wall pipe. Also proposed here are the countermeasures against the problems concerning control of wall thickness homogeneity and drawing-caused concave defect，inner surface quality，and property control，etc. Relevant operation result shows that drawing-caused pipe breaking failure rate can be greatly reduced，and occurrence of drawing-caused concave defects can also be well prevented by means of optimizing deformation distribution，mill pass，and properly controlling of mandrel size and temperature so as to ensure consistent production of the 3.0~3.3 mm HRSG-purposed light-wall pipes. Moreover，the properties of the said small-sized pipe can also be consistently controlled by means of such techniques as the post-descaling/before stretch-reducing medium-frequency induction heat making-up，and control of the post-stretchreducing cooling velocity.
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Keywords:
- CPE push bench mill /
- HRSG-purposed pipe /
- hot-rolling /
- light-wall /
- technical difficulties
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