... and is able to supply all kinds of springs, including Compression spring, Extension spring, Torsion spring, Wire spring, Art ... production diameter: 0.15mm-7.0mm2.iron wire and copper wire production diameter: 0.5mm-10.0mmMaterial of ... corrosion resistant and heat resistant steel wire), bronze, copper, phosphorus copper, beryllium copper. Alloy steel contains 60Si2MNA, 60Si2CRVA, 55CrSi.Product ...