| 摘要 |
PURPOSE:To remarkably enhance the hardness and spring characteristics by cold rolling a patented high carbon steel having a fine pearlite structure at a high draft to convert the structure into a fibrous structure. CONSTITUTION:A high carbon steel contg. 0.4-1.2wt% C and <=0.9wt% Mn is patented to form a fine pearlite structure, and the patented steel is cold rolled at a high draft such as 70-95% to convert the structure into a fibrous structure. The cold rolled steel is then subjected to strain aging at 200-350 deg.C. Thus, a spring material with 400-500 Vickers hardness (Hv) and about 170-210kg/mm.<2> tensile strength is obtd. |
