工程科学学报.第43卷.第7期：960-965.2021年7月 Chinese Journal of Engineering,Vol.43,No.7:960-965,July 2021 https://doi.org/10.13374/j.issn2095-9389.2020.04.29.001;http://cje.ustb.edu.cn 经济型耐腐蚀钢中氧作用的研究 陈学群)，张万灵，陈珊，刘建容)，曹国良)区，李国明) 1)海军工程大学理学院，武汉4300332)武汉钢铁集团有限公司.武汉430080 通信作者.E-mail:mimi7689@163.com 摘要为了治炼不同氧含量的碳素船体钢，通过机械性能试验和周浸试验研究了钢中氧含量对钢材腐蚀性能和机械性能 的影响.结果表明，在连铸生产许可的氧范围内，随着钢水脱氧程度的减弱.钢中氧质量分数增加，钢材的平均腐蚀率略有下 降，而耐点蚀性能有较明显增强，变化曲线的高氧端比低氧端平均点蚀深度下降约227%.弱脱氧钢的机械性能符合规范要 求，可达到D级钢水平.分析认为，氧提高钢材耐蚀性的原因主要是固溶氧可提高铁的热力学稳定性，提高了蚀孔内铁的腐 蚀电位，降低了蚀坑扩展速度.氧作为耐蚀元素应用可以显著降低耐蚀钢的成本，提高经济性. 关键词脱氧：点蚀：耐腐蚀钢：固溶氧：热力学稳定性 分类号TG174.2 Effect of oxygen on economical corrosion resistant steel CHEN Xue-gun,ZHANG Wan-ling?),CHEN San,LIU Jian-rong,CAO Guo-liang,LI Guo-ming) 1)College of Science,Navel University of Engineering,Wuhan 430033,China 2)Wuhan Iron and Steel Group Company,Wuhan 30080,China Corresponding author,E-mail:mimi7689@163.com ABSTRACT Carbon steels are widely used structural materials in vessel and marine engineering.Many studies acknowledge that the pitting corrosion of these materials are heavily subject to their metallurgic factors.Although much attention has been paid on inclusions and microstructure,little had been dealt with metallurgical processing including deoxidizing degrees.Deoxidization is one of the most important processes in steelmaking.Stronger deoxidizing degree helps to improve steel's mechanical property and welding property. However,some studies demonstrated that weaker deoxidizing degree tends to improve pitting corrosion resistance.Manufacturing ordinary structural steels nowadays have been changed from mould casting to continuous casting.However,the deoxidizing degree of continuous casting steel may be different due to different deoxidization techniques.Particularly,the oxygen content in current steels has a fairly low level,which may be harmful to pitting corrosion resistance of steels.In this study,the influence of oxygen content in carbon hull steels on corrosion and mechanical properties of steel was investigated by mechanical properties tests and alternate immersion test. Results show increased oxygen content when there is duction of deoxidization of molten steel in the range permitted by continuous casting.Interestingly,the average corrosion rate of steel slightly decreases and an obvious enhancement of resistance to pitting is observed.The average pit depth corresponding to the high oxygen side of the pit depth-oxygen curve is about 22.7%lower than that of the low oxygen side.The mechanical and cold bending properties of tested steels are able to meet technical code requirements and can reach the level of Grade D hull steel.Findings of this study suggest that solid solution oxygen in steel plays a major role in improving pitting resistance.It can enhance the thermodynamic stability of iron,elevate the corrosion potential of the iron in the pit,and reduce the pitting rate.Therefore,using oxygen as a corrosion resistant element is an economic strategy to reduce the cost of corrosion resistant steel. KEY WORDS deoxidization;pitting;corrosion resistant steel;solid solution oxygen;thermodynamic stability 收稿日期：2020-04-29经济型耐腐蚀钢中氧作用的研究 陈学群1)，张万灵2)，陈    珊1)，刘建容2)，曹国良1) 苣，李国明1) 1) 海军工程大学理学院，武汉 430033    2) 武汉钢铁集团有限公司，武汉 430080 苣通信作者，E-mail：mimi7689@163.com 摘    要    为了冶炼不同氧含量的碳素船体钢，通过机械性能试验和周浸试验研究了钢中氧含量对钢材腐蚀性能和机械性能 的影响. 结果表明，在连铸生产许可的氧范围内，随着钢水脱氧程度的减弱，钢中氧质量分数增加，钢材的平均腐蚀率略有下 降，而耐点蚀性能有较明显增强，变化曲线的高氧端比低氧端平均点蚀深度下降约 22.7%. 弱脱氧钢的机械性能符合规范要 求，可达到 D 级钢水平. 分析认为，氧提高钢材耐蚀性的原因主要是固溶氧可提高铁的热力学稳定性，提高了蚀孔内铁的腐 蚀电位，降低了蚀坑扩展速度. 氧作为耐蚀元素应用可以显著降低耐蚀钢的成本，提高经济性. 关键词    脱氧；点蚀；耐腐蚀钢；固溶氧；热力学稳定性 分类号    TG174.2 Effect of oxygen on economical corrosion resistant steel CHEN Xue-qun1) ，ZHANG Wan-ling2) ，CHEN San1) ，LIU Jian-rong2) ，CAO Guo-liang1) 苣 ，LI Guo-ming1) 1) College of Science, Navel University of Engineering, Wuhan 430033, China 2) Wuhan Iron and Steel Group Company, Wuhan 430080, China 苣 Corresponding author, E-mail: mimi7689@163.com ABSTRACT    Carbon steels are widely used structural materials in vessel and marine engineering. Many studies acknowledge that the pitting corrosion of these materials are heavily subject to their metallurgic factors. Although much attention has been paid on inclusions and microstructure, little had been dealt with metallurgical processing including deoxidizing degrees. Deoxidization is one of the most important processes in steelmaking. Stronger deoxidizing degree helps to improve steel ’s mechanical property and welding property. However,  some  studies  demonstrated  that  weaker  deoxidizing  degree  tends  to  improve  pitting  corrosion  resistance.  Manufacturing ordinary structural steels nowadays have been changed from mould casting to continuous casting. However, the deoxidizing degree of continuous casting steel may be different due to different deoxidization techniques. Particularly, the oxygen content in current steels has a fairly low level, which may be harmful to pitting corrosion resistance of steels. In this study, the influence of oxygen content in carbon hull steels on corrosion and mechanical properties of steel was investigated by mechanical properties tests and alternate immersion test. Results  show  increased  oxygen  content  when  there  is  duction  of  deoxidization  of  molten  steel  in  the  range  permitted  by  continuous casting.  Interestingly,  the  average  corrosion  rate  of  steel  slightly  decreases  and  an  obvious  enhancement  of  resistance  to  pitting  is observed. The average pit depth corresponding to the high oxygen side of the pit depth-oxygen curve is about 22.7% lower than that of the low oxygen side. The mechanical and cold bending properties of tested steels are able to meet technical code requirements and can reach the level of Grade D hull steel. Findings of this study suggest that solid solution oxygen in steel plays a major role in improving pitting resistance. It can enhance the thermodynamic stability of iron, elevate the corrosion potential of the iron in the pit, and reduce the pitting rate. Therefore, using oxygen as a corrosion resistant element is an economic strategy to reduce the cost of corrosion resistant steel. KEY WORDS    deoxidization；pitting；corrosion resistant steel；solid solution oxygen；thermodynamic stability 收稿日期: 2020−04−29 工程科学学报，第 43 卷，第 7 期：960−965，2021 年 7 月 Chinese Journal of Engineering, Vol. 43, No. 7: 960−965, July 2021 https://doi.org/10.13374/j.issn2095-9389.2020.04.29.001; http://cje.ustb.edu.cn