STEEL WIRE FOR SPRINGS HAVING EXCELLENT FATIGUE PROPERTIES, AND SPRING
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United States of America Patent
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Issued Date -
Nov 8, 2018
app pub date -
Jul 16, 2018
filing date -
Jul 16, 2018
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Abstract
A steel wire rod for a spring includes: C: 0.2 to 1.2%, Si: 1.0 to 3%, Mn: 0.1 to 2%, Cr: 3% or less (not inclusive of 0%), Al: 0.0002 to 0.005%, Ca: 0.0002 to 0.002%, Ti: 0.0003 to 0.010%, and balance: iron and unavoidable impurities. An average composition of oxide-based inclusions having a minor axis of 1 μm or more which are present in a cross section satisfies CaO: 35% or less, Al2O3: 40% or less, SiO2: 30 to 95%, MgO: 8% or less, MnO: 5% or less, TiO2: 3 to 10%, and CaO+Al2O3+SiO2+MgO+MnO+TiO2≥80%. The number of oxide-based inclusions having a minor axis of 2 μm or more which are present in the cross section is more than 0.002 inclusions/mm2.
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