吊篮筒体用ER308L埋弧焊丝焊剂研制

Development of ER308L submerged arc welding wire and flux for hanging basket barrel

为实现核电设备制造安装过程中焊接材料的国产化,研制核电吊篮筒体用埋弧焊焊丝和焊剂。通过控制308L埋弧焊丝关键元素C、N,研制出符合核电要求的HS308LH焊丝及配套的SJ601H焊剂,测试其化学成分、力学性能、晶间腐蚀及金相组织等项目。焊丝/焊剂具有焊缝成形良好、脱渣容易、焊接工艺性优良的特点,其熔敷金属的力学性能、铁素体含量、晶间腐蚀性能均满足三代核电技术要求,且有一定的裕量,特别是熔敷金属350℃高温拉伸性能明显提高,裕量较大。所研制的焊材通过了国内主要核一级设备生产厂商的评定。

In order to realize the localization of welding materials in the manufacturing and installation of nuclear power equipment,submerged arc welding wire and flux for hanging basket barrel are developed.By controlling the key elements C and N of 308L submerged arc welding wire,HS308LH welding wire and SJ601H welding flux conforming to nuclear power requirements are developed.The compo-sition,mechanical property,intergranular corrosion and meta-llographic structure of the developed wire and flux are tested.The results show that the wire and flux have the characteristics of good appearance of weld,easy slag removal and excellent welding process.And the mechanical properties,ferrite content and intergranular corrosion properties of the deposited metal all meet the technical requirements of third-generation nuclear power with a certain margin.Especially,the tensile property of deposited metal at 350℃obviously improves with a large margin.The developed welding materials have passed the evaluation of major nuclear grade I equipment manufacturers in China.