Ca、Nb和Sb复合调控对E690海工钢耐蚀性能的影响机理与规律

At present, the low alloy structure steels used in marine engineering in China are far less corrosion resistant than those in foreign countries, which is mainly due to the lack of marine environment corrosion data accumulation and evaluation technology, and study on the effect of steel composition and microsturcture on corrosion mechanism. Studying the effect of main internal factors such as alloy elements, inclusions and microstructures on the macro - micro corrosion mechanism and regularity of the steel under the typically marine environment is of great strategic significance for improving our country's ocean engineering low alloy steel corrosion resistant performance. The purpose of this project is to study the mechanism and rule of the effect of the combination of Ca, Nb and Sb on the corrosion resistance of E690 marine steel. According to studying the collaborative influence of main internal factors such as alloy, inclusions, microstructures, grain size and the distortion on the corrosion resistance in the material service failure process, to realize the further innovation of the macro-and microc- corrosion mechanism and theory of the ocean engineering structural steel. Combined the corrosion mechanism research results with the smelting and rolling process closely, to improve the corrosion resistance of the steel as improving its toughness and weld ability. Based on this, it can provide theoretical basis and engineering demonstration for the realization of large-scale industrial production of high quality ocean engineering corrosion-resistant structural steel.

目前我国海洋用低合金结构钢和国外相比，在耐蚀性上有较大的差异，主要是由于海洋环境腐蚀数据积累及评价技术的缺乏及钢成分、组织调控与耐蚀机理研究的缺乏造成的。研究海洋主要环境下合金化、夹杂物及组织结构等内部因素对材料腐蚀宏观-微观过程的影响机理与规律对提高我国海洋用低合钢耐蚀性能有重要的意义。本项目旨在研究Ca、Nb和Sb三种元素复合调控对E690海工钢耐蚀性影响机理与规律。通过对材料服役失效过程中合金化、夹杂物、相结构和晶粒度及其畸变等内部因素对耐蚀性的协同影响作用机理与规律研究，实现海洋结构钢宏观-微区腐蚀机理与规律理论研究的进一步创新。把腐蚀机理与规律研究结果与冶炼与轧制工艺密切结合，实现了在提高耐蚀钢强韧性和焊接性的同时，其耐蚀性能的正向提升，以此为基础，才能为实现系列化高品质海洋耐蚀结构钢稳定化大批量产业化生产提供理论基础和工程示范。

蚀数据积累及评价技术的缺乏及钢成分、组织调控与耐蚀机理研究的缺乏造成的。研究海洋主要环境下合金化、夹杂物及组织结构等内部因素对材料腐蚀宏观-微观过程的影响机理与规律对提高我国海洋用低合钢耐蚀性能有重要的意义。本项目旨在研究Ca、Nb和Sb三种元素复合调控对E690海工钢耐蚀性影响机理与规律。通过对材料服役失效过程中合金化、夹杂物、相结构和晶粒度及其畸变等内部因素对耐蚀性的协同影响作用机理与规律研究，实现海洋结构钢宏观-微区腐蚀机理与规律理论研究的进一步创新。把腐蚀机理与规律研究结果与冶炼与轧制工艺密切结合，实现了在提高耐蚀钢强韧性和焊接性的同时，其耐蚀性能的正向提升，以此为基础，才能为实现系列化高品质海洋耐蚀结构钢稳定化大批量产业化生产提供理论基础和工程示范。