船舶及海洋工程用耐蚀E36钢板的性能分析

Analysis on Properties of Corrosion-resistant E36 Steel Plate for Ship-building and Marine Engineering

采用耐蚀微合金化、冶金质量控制、夹杂物改性及组织控制的耐蚀性改进技术思路,对E36钢进行了耐蚀性改进研究,并结合控轧控冷工艺对耐蚀E36钢板进行试制。结果表明,微合金化有助于提高钢的自腐蚀电位,高洁净度控制和夹杂物改性可降低点蚀敏感性,组织控制可减小复相组织选择性腐蚀倾向;试制钢板耐海水腐蚀性能较传统E36钢板有了大幅提升,其在酸性氯离子环境中的腐蚀速率降至0.59mm/a,耐蚀性较传统E36钢提高约4.6倍。

By adopting to the idea of improving the corrosion resistance of the E36 steel plate based on corrosion-resistant micro-alloying, control of metallurgical quality, modification of inclusions and control of microstructures, the studies on improving the corrosion resistance of the E36 steel were carried out. Then the corrosion-resistant E36 steel plates were trial-produced by combining with the TMCP technology. The research results showed that the self-corrosion potential of the steel could be improved by micro-alloying and the pitting sensitivity of the steel could be lowered by high cleanliness control of the steel and modification of inclusions, while the selective corrosion tendency in the multiphase microstructure could be reduced by control of micro-structures. Comparing with the traditional E36 steel,the seawater corrosion resistance of the trial-produced steel plate was greatly improved. The corrosion rate of the corrosion-resistant E36 steel in the acidic chloride ion environment was reduced to 0.59 mm/a, and the corrosion resistance was about 4.6 times higher than the traditional E36 steel.