Patent ID: 6165627
Filing Date: 2000-12-26
Classification: C21D,C22C,Y10T

Abstract:
A finished electrical conductor wire having a given cross-sectional area and a longitudinal axis extending perpendicularly to said cross-sectional area, said finished wire comprising an iron alloy including a nickel content (Ni) within the range of 34 to 40.0 wt. % and carbon within the range of 0.1 to 0.5 wt. % as alloying elements, and impurities including as weight % of the alloy: phosphorous (P) 0.01 wt. % at most, sulfur (S) 0.004 wt. % at most, oxygen (O) 0.005 wt. % at most, and nitrogen (N) 0.008 wt. % at most, said alloy in said finished wire having grains with an average grain size within the range of 1 to 5 .mu.m as ascertained from a micrograph taken of said given cross-sectional area, said finished wire further comprising precipitates at boundaries between said grains in said alloy, said precipitates taking up a surface area ratio of 4% at most of said given cross-sectional area, whereby said finished wire has an improved strength and toughness including an improved twisting ability, and a low thermal expansion as determined by said nickel content.