THM550-NQ-Ⅲ(例值)TH550-NQ-Ⅲ0.121.00/2.000.350.0200.0250.30/0.900.20/0.800.20/0.50SJ101用于550-600Mpa强度级别集装箱、铁路机车等耐候钢的焊接天津大桥THM550-NQ-Ⅲ焊丝大桥THM550-NQ-Ⅲ焊丝THM550-NQ-Ⅲ焊丝THM550-NQ-Ⅲ埋弧焊丝天津焊丝***丝天津***丝TH550-NQ-Ⅲ焊丝)