美国泰克罗伊ER347焊丝不锈钢焊丝品名类别AWS型号典型化学成分，%特点和用途CMnSiCrNiMo不锈钢焊丝Techalloy2209ER22090.0161.40.4522.48.53.2双相不锈钢焊接Techalloy308LER308L0.0191.720.4620.810.1Techalloy309LER309L0.0211.750.5123.412.7Techalloy310ER3100.111.900.4027.121.025/20合金Techalloy316LER316L0.0)