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| Development of Low Alloy Seawater Corrosion Resistant Steel |
| GUO Hui-ying，ZHANG Yu，HE Yu-chun， XU Hong-mei |
| Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu， China |
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Abstract Three kinds of Cu-Mo and Cu-Mo-Cr alloyed steels were designed and melted, and then hot rolled into 20mm thick plates, and finally mechanical property, seawater corrosion resistance and weldability of the rolled plates were evaluated. Salt spray tests with 96, 240, 336 and 500 hours were conducted, and all tested steels shows improved corrosion resistance as compared to SM490A, and the superior corrosion resistance is more pronounced with elongation of testing period. Corrosion resistance increases with increasing Cr content, and the corrosion resistance of the steel with 0.85% Cr increases 59.1% as compared to SM490A. The Cr enriched at inner rust layer can effectively withstands diffusion of Cl-, and thus improves corrosion resistance. Gleeble simulation was executed to evaluate steel weldability without preheating and postweld heat treatment, and the impact toughness of the simulated CGHAZ ≥ 57J with cooling rates of 5-60℃/s, which implies the good weldability of the designed steel.
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Received: 07 December 2012
Published: 16 September 2013
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| 1． |
候保容. 海洋环境腐蚀规律及其应用[M]. 北京: 北京科学出版社, 1999: 156-165.2． Roberge P R. Handbook of corrosion engineering [M]. New York, Mc Graw-Hill, 1999: 129-142.3． 胡津津, 石明伟. 海洋平台的腐蚀及防护技术[J]. 中国海洋平台, 2008, 23(6): 39-42.4． 渡边常安. 耐候钢耐海水腐蚀钢的应用现状[J]. 日本造船学会志, 1981, 627: 420-427.5． Melchers R E. Effect of small compositional changes on marine immersion corrosion of low alloy steels[J]. Corrosion Science, 2004, 46,1669-1691.6． Hou B, Li Y, Zhang J. Effect of alloy elements on the anti-corrosion properties of low alloy steel[J]. Bull. Mater. Sci., 2000, 23(3): 189-192.7． Melchers R E. A new interpretation of the corrosion loss processes for weathering steels in marine atmospheres[J]. Corrosion Science, 2008, 50: 3446-3454.8． Miyuki H, Katsumoto N, Hara S. Corrosion and its protection of welded joints of seawater resistant low alloy steel[J]. Sumitomo Metal Technical Report, 1996, 48(2): 68-75.9． 董杰, 崔文芳, 张思勋等. CuPCr钢显微组织对全浸海水腐蚀行为的影响[J]. 东北大学学报(自然科学版), 2007, 28(9): 1293-1296.10． 董杰, 崔文芳, 张思勋等. 海洋工程用超低碳贝氏体钢力学性能和海水腐蚀行为[J]. 材料热处理学报, 2008, 29(3) : 99-103.11． 黄锦花, 李自钢, 钱余海. 低合金耐海水腐蚀钢在模拟腐蚀环境下的耐蚀性能研究[J]. 上海金属, 2006, 28(4): 6-8.12． 杨景红, 刘清友, 王向东. 耐候钢及其腐蚀产物的研究概况[J]. 中国腐蚀与防护学报, 2007, 27(6): 367-372.13． 张全成，王建军，吴建生等. 锈层离子选择性对耐候钢抗海洋性大气腐蚀性能的影响[J]. 金属学报, 2001, 37(2): 193-196.14． Kim Sung-Joon, Lee Chang-Gil, Lee Tae-Ho, et al. Effect of Cu, Cr and Ni on mechanical properties of 0.15 wt.% C TRIP-aided cold rolled steels[J]. Scripta materialia, 2003, 48: 539-544. 15． Bonnevie E, Ferriere G., Ikhlef A, et al. Morphological aspects of martensite-austenite constituents in intercritical and coarse grain heat affected zones of structural steel[J]. Materials science and Engineering A, 2004, 385: 352-358.16． ZHANG Yu, PAN Xin, XIE Jian-chang. Development of 610 MPa grade steel plate with low yield ratio through thermo-mechanical controlled processing with accelerated cooling[C]. The proceedings of 10th Inter Confer on Steel Rolling, Beijing, 2010, 385: 214-219.
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2013, Vol. 48 
