Material 1018 1015 Softballs - 1018 Steel Carbon .15 - .20 .13 - .18 .15 - .20 Manganese .6 - .9 .3 - .6 .6 - .9 Phosphorous .04 max. .04 max. .04 max. Sulphur .05 max .05 max .05 max Hardness RC 60 min. RC 60 min. N/A Size Range As small as 0.3mm As small as 0.3mm As small as 0.3mm Grades 3510255010020050010002000 3510255010020050010002000 3510255010020050010002000 Characteristics Low carbon steelnot corrosion resistant Low carbon steelnot corrosion resistant Low carbon steelnot corrosion resistantWelding capabilities General Usage Bearings, automotive and commercial applications such as castors, locks, and drawer slides Bearings, automotive and commercial applications such as castors, locks, and drawer slides Decorative