Steel wire for drawing
A steel wire for drawing includes, as a chemical composition, by mass %: C: 0.9% to 1.2%, Si: 0.1% to 1.0%, Mn: 0.2% to 1.0%, and Cr: 0.2% to 0.6%, limits Al, N, P, and S to be predetermined ranges, and includes one or more selected from the group consisting of Mo: 0% to 0.20%, and B: 0% to 0.0030%, a remainder of Fe and impurities; in which a metallographic structure includes pearlite, a volume fraction of the pearlite is 95% or higher, an average lamellar spacing of the pearlite is 50 nm to 75 nm, an average length of cementite in the pearlite is 2.0 μm to 5.0 μm, and a ratio of the number of grains of cementite with a length of 0.5 μm or smaller to the cementite in the pearlite is 20% or lower.
1. A steel wire for drawing comprising, as a chemical composition, by mass %,
C: 0.9% to 1.2%,
Si: 0.1% to 1.0%,
Mn: 0.2% to 1.0%,
Cr: 0.2% to 0.6%,
Al: limited to 0.002% or less,
N: limited to 0.007% or less,
P: limited to 0.02% or less,
S: limited to 0.01% or less, and
one or more selected from the group consisting of
Mo: 0% to 0.20%, and
B: 0% to 0.0030%, and
a remainder of Fe and impurities,
wherein a metallographic structure includes a pearlite, and a volume fraction of the pearlite is 95% or higher,
an average lamellar spacing of the pearlite is 50 nm to 75 nm,
an average length of cementite in the pearlite is 2.0 μm to 5.0 μm, and
a ratio of the number of grains of cementite with a length of 0.5 μm or smaller to the cementite in the pearlite is 20% or lower.
2. The steel wire for drawing according to claim 1 , comprising, as the chemical composition, by mass %,
one or more selected from the group consisting of
Mo: 0.02% to 0.20%, and
B: 0.0005% to 0.0030%.