东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (2): 250-253.DOI: -

• 论著 • 上一篇    下一篇

一种耐海水腐蚀型超低碳贝氏体钢的研究

张思勋;崔文芳;董杰;刘春明;   

  1. 东北大学材料各向异性与织构教育部重点实验室;莱芜钢铁股份有限公司技术中心;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50971033);;

Development of an ultra-low carbon bainitic steel with resistance to marine corrosion

Zhang, Si-Xun (1); Cui, Wen-Fang (1); Dong, Jie (2); Liu, Chun-Ming (1)   

  1. (1) Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; (2) Technology Center of Laiwu Iron and Steel (Group) Co. Ltd., Laiwu 271104, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Cui, W.-F.
  • About author:-
  • Supported by:
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摘要： 为了开发具有高强度、高韧性和耐海水腐蚀性的海洋工程用钢,考察了含磷超低碳贝氏体钢的组织、力学性能和耐海水腐蚀性.超低碳贝氏体钢中磷的质量分数提高至0.09%时能够产生较强的固溶强化作用,而对室温至-40℃范围内的低温冲击韧性影响不大,这归因于钢中C,B原子在原始奥氏体晶界通过竞争机制抑制了P的偏聚,减弱了P产生的冷脆性.与无磷和低磷含量超低碳贝氏体钢相比,高磷含量超低碳贝氏体钢在3.5%NaCl溶液中全浸腐蚀速率明显降低.Cu,P的复合作用促进了致密的内锈层的形成,有效阻止了Cl-的进一步侵蚀.

关键词: 低合金钢, 超低碳贝氏体钢, 强度, 韧性, 耐海水腐蚀性

Abstract: The microstructure, mechanical properties and marine corrosion resistance of hot-rolled ultra-low-carbon phosphorus-bearing bainitic steel sections were investigated so as to develop a steel specially used in sea water with its high toughness and resistance to marine corrosion. The results showed that adding 0.09wt% P in the steel can provide strong solution strengthening with weak effect on impact toughness within the temperature range from room temperature to -40°C. The fact is attributed to that P segregation at austenite grain boundaries is inhibited due to the competition between C, B and P atoms, thus weakening the cold brittleness caused by P atoms. Compared with the ultra-low-carbon bainitic steels with or without P, the corrosion rate of the ultra-low-carbon bainitic steel with high P content fully submerged in 3.5%NaCl solution decreases obviously. The complex effect of Cu and P elements promotes the formation of a dense inner rust layer to resist the further penetration of Cl- in the solution.

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