关于无缝钢管中频热扩工艺的认识

介绍了无缝钢管中频热扩工艺及其特点;详述了中频热扩工艺的质量控制,通过选用无缺陷的坯料、复验合格的原管、严格的工艺要求和完善的检测手段完全可以保证中频热扩钢管的制造精度、整体质量和可靠性。分析认为:中频热扩过程中的双向受压、单向受拉的受力状态,以及热扩过程中通过智能温度控制系统保持相对较低的加热温度和推进速度,可以有效地降低热扩过程中产生缺陷或使缺陷扩展的风险。建议用发展的眼光重新认识中频热扩工艺的加热方式、加热温度、受力状态和产品质量。

Understanding of Intermediate Frequency Hot Expanding Process for Seamless Steel Tube

Introduced in the paper is the intermediate frequency (IF) hot expanding process and its characteristics. Elaborated is the quality control of the IF hot expanding process. By selecting flawless billets, requalifying mother tubes, specifying strict process requirements and adopting thorough testing methods, it is possible to guarantee the dimension accuracy, the overall quality and the reliability of the IF hot-expanded steel tubes. The analysis indicates that the risk of producing or spreading defects during the hot expanding process can be efficiently lowered by experiencing a load condition of bidirectional-compression-unidirectional-tension during the IF hot expanding process, and by maintaining a relatively low heating temperature and a relatively low pushing speed using an intelligent temperature control system during the hot expanding process. It is necessary to reacquaint the heating mode, the heating temperature, the load condition and the product quality of the IF hot expanding process from a developmental perspective.