STEEL WIRE FOR SPRING HAVING EXCELLENT LOW TEMPERATURE FATIGUE STRENGTH AND METHOD OF MANUFACTURING THE SAME

摘要

The present invention relates to a steel wire for spring excellent in low temperature fatigue strength and a method of manufacturing the same. In one embodiment of the present invention by weight, carbon (C): 0.40-0.70%, silicon (Si): 1.0-2.5%, manganese (Mn): 11-25%, chromium (Cr): 0.3-1.0% , Aluminum (Al): 1.0 to 2.0%, phosphorus (P): 0.020% or less, sulfur (S): 0.020% or less, balance Fe and other unavoidable impurities, wherein C, Mn, Si, and Al are represented by It satisfies 1, and the microstructure includes at least 95 area% of austenite, and provides a spring steel wire having excellent low temperature fatigue strength in which primary and secondary strained twins are formed in the austenite grains. [Relationship 1] 19 C x Mn x Si x Al 25 (wherein C, Mn, Si, and Al are by weight.)