Chrome Silicon Commercial Quality wire is designed for springs that must withstand considerable shock and extreme heat. Chrome silicon can be used at temperatures up to 50°F higher than chrome vanadium. Recommendations for heat treatment: Immediately after coiling, the springs should be stress relieved at about 400°C (750°F) for 30 minutes. After shot peening, the springs should be stress relieved at about 250°C (480°F) for 30 minutes. Wire is available in size ranges from 0.018" - 0.625". Chrome Silicon is uses in many applications but commonly for automotive end uses. Gibbs stocks a vast inventory of items (see below) for immediate shipment from our 7 locations in the US, Canada, and Mexico.  Chrome Silicon conforms to ASTM-A-401 less