... -1996, GB 1102-74, SC 1443-86, ISO, BS, DIN, JIS, API 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 ...