焊条牌号标准型号GBT5117AWS.A5.1主要用途及特点熔敷金属化学成分()及力学性能J422CuCrNiE4303耐候钢专用焊条用于09CrP09CuPRe 09CuCrNi等耐候钢焊接具有良好的耐大气腐蚀性能C≤0.12Mn 0.40Si 0.20S≤0.035P≤0.040Cr≤0.60Cu 0.40Ni≤0.5σb≥420MPaσs≥330MPaδ5≥22AKV≥27J(0℃)?