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材料工程  2009 

抗CO2腐蚀低Cr管线钢组织和性能研究

, PP. 6-10

Keywords: 低Cr合金钢,组织,力学性能,CO2腐蚀,焊接性

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Abstract:

在管线钢中添加1%~5%(质量分数,下同)Cr可提高其抗CO2腐蚀能力,本工作重点研究了Cr含量对低Cr管线钢组织、力学性能、耐蚀性能及焊接性能的影响.结果表明3%~5%Cr元素的添加可使钢的组织由铁素体加少量珠光体变为以贝氏体为主.1%以上Cr的加入即可提高钢的硬度、强度,同时保持良好的韧性.由于富Cr保护性腐蚀产物膜的形成,3%~5%Cr的添加可显著降低CO2全面腐蚀速率,并抑制局部腐蚀的发生.含1%~5%Cr的合金钢焊接接头具有较好的综合力学性能,但5%Cr钢焊接接头热影响区硬度偏高.

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