Patent ID: 6800147
Filing Date: 2004-10-05
Classification: B21C,C21D,C22C,D07B,Y10T

Abstract:
A high-strength steel wire excellent in resistance to strain aging embrittlement and longitudinal cracking, the wire havinga chemical composition (in mass %) including C: 0.75-1.20% Si: 0.1-1.5%, Mn :0.3-1.2%, P: no more than 0.02%, S: no more than 0.02%, Al: no more than 0.005%, N: no more than 0.008%, and a remainder of Fe and inevitable impurities; a worked pearlite structure containing lamellar cementite in amorphous form; a diameter (D) in a range of from 0.15 to 0.4 mm; a metal lubricating film as a surface layer whose main phase comprises at least one of Cu, Ni, and Zn or an alloy thereof; and a tensile strength no lower than 3500Ã—Dâˆ’0.145 MPa and no higher than (3500Ã—Dâˆ’0.145+87Ã—[C]âˆ’5) MPa, where [C] denotes C content in %.