Wire rod for suspension spring with eccellent corrosion fatigue life

摘要

The paper reveals that the mechanism of corrosion fatigue properties fro suspension spring can be classified into two elements. One is corrosion-pit, and the other is hydrogen embrittlement. Corrosionpits are improved by adding copper and nickel, and the hydrogen embrittlement is improved by titanium. A new steel grade applying this concept achieves very successful corrosion fatigue life.