Influence of Creq/Nieq on pitting corrosion resistance and mechanical properties of 2304 duplex stainless steel welded joints

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• 作者：LI ZhaoJIANG YimingTAN HuaHONG JufengLI Jin
• 会议时间：2013-06-01
• 关键词：duplex stainless steel ; welding ; thermal cycle ; pitting corrosion
• 作者单位：Department of Materials Science,Fudan University,Shanghai 200433,China
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

Pitting corrosion resistance and mechanical properties of 2304 duplex stainless steel with different Crcq/Nicq values after plasma-arc welding and welding thermal simulation were systematically studied.The results showed that the lower the Creq/Nieq value in the experimental range,the better the microstructure after welding or welding thermal cycle.High pitting resistance equivalent number in the chemical composition brought in low weight loss rate and high critical pitting temperature for base metal.Furthermore,the degradation of pitting corrosion resistance after welding thermal cycle was less.while the Creq/Nieq value was lower.