高强度焊条熔敷金属合金系研究

Research on Deposited Metal Alloy Series of High-Strength SMAW Electrode

摘要: 对MnNiCrMo和7%NiMo合金系的高强度焊条熔敷金属进行了试验研究。结果显示,MnNiCrMo系可在0.05%-0.07%碳含量条件下获得屈服强度大于900MPa的高强度焊缝金属,A_kv-50℃40-60J,焊缝屈强比0.93-0.98,强度稳定;7%NiMo合金系可在≤0.05%碳含量条件下获得屈服强度大于900MPa的高强度焊缝金属,A_kv-50℃50-80J,焊缝屈强比0.92-0.94,焊缝金属塑性较差。从焊缝金属组织类型、残余奥氏体含量等角度分析了其原因,为高焊条熔敷金属合金系的优化选择提供了必要的基础。

Abstract: Deposited metal of high-strength SMAW electrode of MnNiMo and 7%NiMo alloy series were investigated.The results indicate that high-strength weld metal from MnNiCrMo series electrodes were obtained on condition of 0.05%-0.07% carbon content with yield strength exceeding 900MPa,toughness A_kv-50℃ 40-60J and yield ratio 0.93-0.98.The strength was stable.High-strength weld metal from 7%NiMo series electrodes were obtained at the condition of carbon content below 0.05% with yield strength exceeding 900MPa,toughness A_kv-50℃ 50-80J and yield ratio 0.92~0.94,while the plasticity of the weld metal was poor.The weld metallurgical microstructure and residual austenite content were analyzed,which provided necessary foundation for optimizing deposited metal alloy series of high-strength SMAW electrode.