Si-killed steel wire rod and spring

摘要

A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from such steel wire rod are provided. In the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-35%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and BaO: 0.2-20% respectively, and total content of (CaO+MgO) is 3% or above.

主权项

1. A Si-killed steel wire rod, comprising: 0.03-30 mass ppm of Ba, 1-30 mass ppm of Al, and 2-4 mass % of Si, and a total of Mg and Ca in a range of 0.5-30 mass ppm, wherein the balance is Fe and inevitable impurities.