=330 抗拉強(qiáng)度410-550 延伸力>=22% 沖擊韌性0℃>=27 C<=0.10 Mn 0.80-1.10 Si =0.070 Cr<=0.20 Ni<=0.30 S<=0.030 P<=0.030 主要用途:與焊劑HJ431配合,用于碳鋼及某些相應(yīng)等級(jí)的低合金鋼焊接(如建筑、橋梁、壓力容器)">