... , 304, 316, 130M, 304ES, 201CU, 631, 200CU, 200CU- Stainless steel spring wire products: A) Material Classification: 200 series: 201, 202 300 ... ; Coppering; Lead plating and so on D) Purpose Classification: For spring; Cold upsetting; Welding; Wire rope E) Physical Classification: Magnetic / Nonmagnetic F ... wire; Pressure flat wire; Precision shaped wire bright Stainless Steel Spring Wire