A508-3 Cl.2锻件配套氩弧焊焊丝研制

Design of argon arc welding wire for A508-3 Cl.2 forging

针对核电产品蒸汽发生器、稳压器用A508-3 Cl.2钢母材,开展A508-3 Cl.2钢配套的焊接材料和焊接工艺的研究工作。研制的焊丝通过调整合金元素比例,对S,P,Co等有害元素进行有效地控制,抗拉强度和冲击韧性均有明显提升。焊缝金相组织未见硬脆相,组织柱状晶消失并转化为等轴晶,组织细化,单位面积晶界比例明显上升,使得位错扩展受到阻碍,宏观表现韧性提高。研究结果表明,研制的HS09MnNiMoHR低合金钢氩弧焊丝具有良好的焊接工艺性能,力学性能满足项目要求。

The research work on welding materials and welding process of A508-3 Cl.2 steel for nuclear power steam generator and regulator was carried out.Through adjusting and integrating the ratio of alloy elements,the strength of tensile strength and impact toughness were improved obviously.The harmful elements such as S,P,Co were effectively controlled.There was no hard and brittle phase in the weld phase,and the tissue columnar crystals disappeared and converted into equiaxed crystals.The proportion of grain boundaries per unit area of tissue refinement increased significantly,causing dislocation expansion to be hindered.Macroscopic performance toughness was improved.The results showed that the HS09MnNiMoHR low alloy steel argon arc welding wire had good welding performance and the mechanical properties met the requirements of the project.