US 9,540,718 B2 · High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire

Abstract

A technique with which air blast cooling can be used to produce a high-strength steel wire material that achieves uniform high strength and high ductility, even when cold drawn; a high-strength steel wire produced from this high-strength steel wire material; and a zinc-plated high-strength steel wire. This high-strength steel wire material includes 0.80-1.3% of C, 0.1-1.5% of Si, 0.1-1.5% of Mn, more than 0% but not more than 0.03% of P, more than 0% but not more than 0.03% of S, 0.0005-0.01% of B, 0.01-0.10% of Al, and 0.001-0.006% of N, the remainder being iron and unavoidable impurities. The area ratio of pearlite in the structure of the high-strength steel wire material is at least 90%. The average grain size number (Pave) of pearlite nodules and the standard deviation (Pσ) thereof respectively satisfy formula (1), namely 7.0≦Pave≦10.0, and formula (2), namely Pσ≦0.6.

Claims6

Dependent claims

A high-strength steel wire rod having good rod drawability, comprising:

C:
0.80 to 1.3% (by mass percent (the same applies to the following for the components));
Si:
0.1 to 1.5%;
Mn:
0.1 to 1.5%;
P:
more than 0% and 0.03% or less;
S:
more than 0% and 0.03% or less;
B:
0.0005 to 0.01%;
Al:
0.01 to 0.10%;
N:
0.001 to 0.006%;
and
the remainder being iron and inevitable impurities,
wherein, in a microstructure of the steel wire rod, an area ratio of pearlite is 90% or more, and an average Pave and standard deviation Pσ of a pearlite nodule size number satisfy Formulas (1) and (2), respectively,
7.0≦Pave≦10.0 (1) and
Pσ≦0.6 (2).

18 more elements

Dependencies are inferred from the claim text.

High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire

Life of this patent

High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire

Life of this patent

Abstract

Claims6