Steel wire for drawing
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsYoshihiro Daito, Junichi Kodama, Masashi Sakamoto
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Abstract
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.
Claims2
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.
Dependencies are inferred from the claim text.