... and RRW-410D Item Information Steel materials quality carbon spring steel ,60# ,65#,70#,72A,82B StandardISO ,DIN, ASTM,JIS , etc Tensile ... strength1770mpa,1570mpa,1670mpa,1860mpa,1960mpa Highcarbon spring steel wire (Galvanized, ... having red rust . Diameter1. 0.15 mm -12 mm ( carbon spring steel wire ) 2.1.2 mm - 20 mm ( steel wire ...