Unalloyed steel having excellent resistance to crack formation in the longitudinal direction, a steel product for the same and method for producing the same

摘要

Unalloyed steel wire, comprising 0,65 – 1,2% by weight of c, 0,1 – 2,0% by weight of si, 0,2 – 2,0% by weight of mn and the balance fe and unavoidable impurities, wherein the structure as a main phase perlite, and the surface proportion of proeutectoid ferrite in the surface layer to a depth of 50 μm is less than 0,40%.