OK74.78是一款适合焊接低温应用所用高强度钢的LMA焊条。其在温度低至-40°C条件下具有优良的缺口韧性。非常适合用于要求硬度达到约250HV的强制成形焊接和轨道堆焊。OK74.78极低的药皮含水量非常适合无法进行预热的应用。TypicalTensilePropertiesAsweldedElongationTensileStrengthYieldStrength保护气体StressRelievedTemperatureStressRelievedTestingTime24%650MPa600MPaISO--StressrelievedElongationTensileStrengthYieldStrength保护气体StressRelievedTemperatureStressRelievedTestingTime---AWS620°C1hr夏比V型缺口冲击性能AsweldedImpactValueTestingTemperature保护气体StressRelievedTestingTempStressRelievedTestingTime90J-40°CISO--70J-50°CISO--StressrelievedImpactValueTestingTemperature保护气体StressRelievedTestingTempStressRelievedTestingTime--50°CAWS620°C1hr焊缝金属分析MnMnMoCSiNiCr1.60%-----MoMnMoCSiNiCr-0.35%----CMnMoCSiNiCr--0.05%---SiMnMoCSiNiCr---0.35%--NiMnMoCSiNiCr----0.03%-CrMnMoCSiNiCr-----0.03%熔敷数据Fusiontimeperelectrodeat90%Imaxkgweldmetal/kgelectrodesNumberofelectrodes/kgweldmetal安培熔敷率电压V直径55sec0.62kg73.075-100A0.90kg/h22V2.5x350mm86sec0.65kg32.0105-140A1.30kg/h23V3.2x450mm97sec0.65kg20.5140-190A1.80kg/h23V4.0x450mm100sec0.68kg14.0190-260A2.60kg/h24V5.0x450mm103sec0.69kg10240-340A3.6kg/h24V6.0x450mm)