aisi 6150 spring steel 1. Spring flat steel 2.Material: 65Mn, 60Si2Mn, SUP9, SUP7, SUP11,50CrVA 3. Size: 6*40~20*15 aisi 6150 spring steel 1. Material: 65Mn, 60Si2Mn, SUP9, SUP9a, SUP7, SUP11, 50CrVA etc.2.Thickness: 6~20mm, Width: 40~150mm, Length: 2~8m, according to your requirements.3. Surface: smooth plain; double grooved.4. Standard: GB, ASTM, JIS5. Usage: springs and chains for car and ...