High temperature normalisation: the impact of scale growth on surface cosmetics and performance of carbon steel conveyance tubes

背景/概述塔塔钢铁公司的低碳钢输送管经过900摄氏度的正火处理，以消除高频感应焊接引起的不希望看到的热影响区。然而，这种重新加热会产生严重的表面处理问题，并由于对高温氧化的保护不足而导致严重的加工效率低下。正火过程中管子表面的结垢生长，导致随后的附加值涂层不希望看到的剥落，危及作为高性能热成形产品的Install 235管材。该项目旨在改善表面质量，防止剥落，并通过提供均匀的涂层，减少产量损失和故障，同时为运输产品提供适销对路的好处。该项目将结合高温炉复制实验和先进的成像技术，发现影响结垢生长的因素，以及新型防腐涂料对表面质量的影响。技术包括扫描电子显微镜、能谱仪、X射线衍射仪、轮廓术、白光干涉法、高级显微镜和拉曼光谱。项目目的本项目将结合高温炉复制实验和先进的成像技术，以发现影响结垢的因素和新型防腐涂层对表面质量的影响。研究技术包括扫描电子显微镜、能谱仪、X射线衍射仪、轮廓术、白光干涉法、先进显微镜和拉曼光谱。研究工程师将与塔塔钢铁(塔尔博特港)合作，研究如何将这样开发的方法应用于用作管材生产原料的钢坯。目的：-调查由于结垢生长而正火后钢厂加工条件对表面质量的影响。-确定可改善表面质量的合适方法，-开发新的技术和技术来评估产品质量，并促进改进除鳞后附着的氧化物残留物的方法。-在优化后续的预防性解决方案以改善塔塔输送产品的表面光洁度之前，分析由于新的涂层解决方案而导致的结垢减少。-全面分析表面分层的原因以及炉膛条件对外观问题的影响。-优化现有的和新的涂层解决方案，以改善输送管道的表面质量。-开发一种新的和改进的应用技术，以提高涂层性能，并为钢管提供高质量的表面光洁度。

Background/OverviewTata Steel's low carbon steel conveyance tubes undergo a 900 degree C normalisation to remove an undesirable heat affected zone caused by high frequency induction welding. This reheating however, generates significant surface conditioning issues and instigates severe processing inefficiencies due to insufficient protection from high temperature oxidation.Scale growth on the surface of the tube from normalisation, causes unwanted spallation of subsequent added value coatings compromising Install 235 tube as a high performance, hot formed product. This project aims to improve surface quality and prevent spallation and through delivering a uniform coating, reduce yield loss and failures whilst providing a marketability benefit for conveyance products. This project will combine high temperature furnace replication experiments with advanced imaging techniques to discover the factors influencing scale growth and the effects of novel preventative coatings on surface quality. Techniques include SEM, EDS, XRD, Profilometry, White-Light Interferometry, Advanced Microscopy and Raman Spectroscopy.Project AimsThis project will combine high temperature furnace replication experiments with advanced imaging techniques to discover the factors influencing scale growth and the effects of novel preventative coatings on surface quality. Techniques include SEM, EDS, XRD, Profilometry, White-Light Interferometry, Advanced Microscopy and Raman Spectroscopy.The research engineer will work jointly with TATA Steel (Port Talbot) to investigate how methodologies so developed may be applied to steel slab, used as feedstock for tube production.Aims:- To investigate how the mill processing conditions impact surface quality after normalisation due to scale growth.- To determine suitable methods in which surface quality may be improved, due to alterations in the thermal cycle or through coating solutions prior to reheating.- Develop new techniques and technologies to assess product quality and facilitate methods of improving adhered oxide remnant after descaling.- To analyse scale reduction due to new coating solutions before optimising subsequent preventative solutions for the improvement of surface finish of the Tata conveyance products. - A comprehensive analysis of the causes of surface delamination and the impact of furnace conditions on cosmetic issues due to scale.- Optimisation of current and novel coating solutions to improve the surface quality of the conveyance tubes.- Development of a new and improved application technique to enhance coating performance and provide a high-quality surface finish to the steel tubes.