... 321, About 300 series stainless steel welding wire300 series stainless steel welding wire are with high chemical inertness ... machinery, medical, food, electron, chemical, aviation. stainless steel welding wire products:A) Material Classification: 200 series: 201, 202 ... so onD) Purpose Classification:For spring; cold upsetting; welding; wire ropeE )Physical Classification:Magnetic / NonmagneticF) Shape ...