厚规格X52MS抗HIC性能的研究

Study on Resistance to Hydrogen Induced Cracking(HIC)for X52MS with Thick Gauge

选用工业生产的酸性服役X52MS管线钢热轧卷板为研究对象,从微观组织和化学成分分析材料性能。主要研究其在硫化氢(H_(2)S)溶液中抗氢致开裂(HIC)行为,用氢致开裂试验考察了微观组织及微区成分对抗HIC性能的影响,分析了裂纹产生的主要原因,找出裂纹产生的规律。总结出带状组织是导致该材料抗HIC性能失效的主要原因,碳偏析和碳氮化合物夹杂中心聚集会加重带状组织对HIC性能的影响;低碳成分设计思路是酸性服役管线钢设计的前提,同时,合理控制氮含量也是酸性服役管线钢生产时考虑因素之一。

The hot-rolled coil with X52MS pipeline steel for acid service by industrial production is chosen as the research object as well as its material performances are analyzed from microstructure and chemical components.Its resistance to hydrogen induced cracking(HIC)behavior in H_(2)S solution is mainly studied,the effects of microstructure and microregion components on the resistance to HIC are investigated by HIC test as well as the main causes for crack generation are analyzed so that its regularities are found out.It is summarized that banded structure is the main cause for failure of resistance to HIC for this material,carbon segregation and central aggregation of inclusion of carbohydrates and nitrogenous compounds would worsen the effects of banded structure on the HIC performance;the thought of low carbon component design is the premise of designing pipeline steel for acid service as well as reasonable control of nitrogen content is also one of the considerations in production of pipeline steel for acid service.