Chromium vanadium spring wire is an optimum alternative for high-stress applications where large diameter spring are used. As the most popular spring wire, chromium vanadium are capable of a huge number of operating cycles. Medium carbon steel with added elements of chromium and vanadium increases its hardness and tensile strength. Oil tempered metal is ideal for valve or gun springs. Confirms to ASTM-A-231 specification and wire comes in size from 0.135" to 0.5".