HIGH-STRENGTH STEEL WIRE MATERIAL EXHIBITING EXCELLENT COLD-DRAWING PROPERTIES, AND HIGH-STRENGTH STEEL WIRE

摘要

Provided are: a technique with which air blast cooling can be used to produce, with excellent productivity, a high-strength steel wire material capable of achieving 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 respectively 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 comprising 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.

主权项

1. 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%; and N: 0.001 to 0.006%; the remainder consisting of 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)Pσ≦0.6   (2)