本数据集围绕“突破低温用特厚钢带的合金设计、在线全流程组织细化、微观结构精细调控等关键技术、开发低温超大输量管道用钢的成套工业化制造技术等内容开展工作，旨在开发出宽度满足 Φ1422mm制管要求，最大厚度 21.4mm，屈服强度 555MPa 级的低温管线钢带，满足-40℃极寒地区服役的超大输量管道工程建设对板材的技术要求，实现低温用管线钢的完全国产化”的目标，主要研究内容与结论如下：进行了超纯净钢冶炼控制技术研究，实现批量产品中 P 元素含量低于 0.015%、S 元素含量低于 0.0020%、夹杂物全系控制在 2.0 级别以下；完成了高质量铸坯控制技术研究与工艺优化，通过调整“高过热度+二冷强冷+大压下量”的连铸工艺来提高板坯中心偏析控制水平，改善了板卷的带状组织；研究了加热制度对板坯奥氏体晶粒形貌、析出行为的影响机理，实现了最佳加热制度设计；进行了轧制过程中奥氏体再结晶细化与均匀化控制轧制技术研究，分析了轧制阶段奥氏体晶粒再结晶与细化规律，形成了最优轧制工艺方案；研究了全厚度组织细化均匀化、多相组织最佳配比的冷却工艺控制技术，制定了板卷头部最佳冷却工艺路径，实现了带钢干头总长度控制在 2-3m 目标，形成最佳冷却工艺方案；进行了 21.4mm X80 钢带卷取温度对组织影响规律研究，形成了最佳的卷取温度工艺制度；实现 21.4mm X80 低温管线钢钢带工业化批量生产，钢卷批量性能良好，韧性方面，-55℃冲击功≥245J、-20℃ DWTT 剪切面积≥85%。

This data set focused on the aim of “making a serial of breakthroughs on key technologies such as the alloy design of ultra-thick steel strips for low-temperature use, on-line refinement of microstructure, precise adjustment of microstructure and so on; and developed a whole set of industrialized manufacturing technologies for low-temperature ultra-large-volume pipeline steel, aiming to develop a low-temperature pipeline steel strip with width that meets the requirements of Φ1422mm for pipe making, maximum thickness of 21.4mm, and yield strength of 555MPa, which meets the technical requirements for coils in the construction of ultra-large-volume pipelines for service in extreme cold areas at -40°C. The main research content and conclusions are as follows: The research on ultra-pure steel smelting control technology has been carried out, and the content of P element in batch products is less than 0.015%, the content of S element is less than 0.0020%, and the entire system of inclusions is controlled below 2.0; which completed the research and process optimization of high-quality slab control technology, and improved the control level of slab center segregation by adjusting the continuous casting process of "high superheat + secondary cooling + large reduction" The mechanism how the reheating system works on the austenite grain morphology and precipitation behavior was studied, and the optimal heating system design was achieved; the research on austenite recrystallization and refinement in the rolling process were carried out. Research on homogenization controlled rolling technology revealed the evolution principle of austenite grain recrystallization and refinement in the rolling stage, and the optimal rolling process plan has formed; the uniformity of the full-thickness structure and the optimal configuration of the multi-phase structure were studied. The optimal cooling process path of the coil head was formulated, and the total length of the strip dry head was controlled within 2-3m, which is the key of the best cooling process. The research on the influence of coiling temperature on the structure was carried out and the best coiling temperature process system were figured out. The industrialized mass production of 21.4mm X80 low-temperature pipeline steel strips has been realized. The good performance especially toughness, -55℃ impact energy ≥245J, -20 ℃ DWTT shear area ≥85%, has been achieved too for batch production.