本发明公开了一种厚规格高韧性X80管件钢钢板及制造方法。采用低碳“Nb+Mo+V+Ni+Ti”多元微合金独特成分设计，保证厚规格X80管件钢在热处理后具有优异的强度富裕量和高韧性性能，利用高洁净钢和无缺陷连铸坯渐进式柔性轻压下技术，改善钢中夹杂物，使钢中各类夹杂物级别≤1.5级，消除钢坯乃至钢板裂纹缺陷，借助TMCP轧制和全程系统消应力工艺提高厚规格X80管件钢板的韧性性能，改善钢板板形，借助高温回火热处理工艺，实现热扩散处理，释放内应力以及改善钢板中心线区域的组织结构和韧性；解决了X80级别管件钢板热处理后强度富裕量偏低、韧塑性差、焊接性能不良、整板性能均匀性差、板形不良等问题。

The invention discloses a thick specification high toughness X80 pipe steel plate and a manufacturing method thereof. The unique composition design of low-carbon "Nb+Mo+V+Ni+Ti" multi-component microalloy is adopted to ensure that thick X80 pipe steel has excellent strength enrichment and high toughness after heat treatment. The inclusion in steel is improved by using high clean steel and the progressive soft and light pressing technology of fault-free continuous casting billet, so that the grade of all kinds of inclusion in steel is less than or equal to 1.5. To eliminate cracks and defects in billets and steel plates, TMCP rolling and the whole process of systematic stress relief process are used to improve the toughness of thick X80 pipe steel plate, improve the shape of the steel plate, with the help of high temperature tempering heat treatment process, achieve thermal diffusion treatment, release internal stress and improve the structure and toughness of the center line area of the steel plate; After heat treatment, the problems of low strength enrichment, poor toughness and plasticity, poor welding performance, poor homogeneity of whole plate performance and bad shape of X80 grade pipe fitting steel plate were solved.