STEEL WIRE ROD EXCELLENT IN COLD WORKABILITY

摘要

PROBLEM TO BE SOLVED: To provide a steel wire rod provided with sufficient deformability by the reduction of deformation resistance in low-medium carbon steel and low-medium carbon low alloy steel as hot-rolled and excellent in cold workability even if spheroidizing annealing treatment is simplified or omitted. SOLUTION: This steel wire material is the one contg. by mass, 0.03 to 0.8% C in which the average grain size of ferrite is 2 to 5.5μm and also, the region in which the ratio of cementite having <=3μm major axis and <=3 aspect ratio shown by (the major axis/the minor axis) becomes >=70 area % to the whole cementite is the region of >=10% of the wire diameter from the surface.