Tire having corrosion resistant steel cord

摘要

A steel cord intended for use to reinforce rubber products is produced by drawing, into a steel filament of 0.10 to 0.40 mm in diameter and more than 3,000 N/mm2 in strength, a wire rod having a carbon content of more than 0.70% by weight, and twisting a plurality of such steel filaments together. Also a pneumatic tire is provided which employs in at least a portion of a reinforcing member thereof the steel cord improved in corrosion resistance and having an R1/R0 ratio x100 which is less than 100, where R0 is the radius of spiral curvature of the spiraled steel filament resulting from untwisting said steel cord and R1 is the radius of spiral curvature of said steel filament of which the surface layer inside the spiral is removed by dissolving.