| 摘要 |
PCT No. PCT/FR90/00920 Sec. 371 Date Jun. 17, 1992 Sec. 102(e) Date Jun. 17, 1992 PCT Filed Dec. 18, 1990 PCT Pub. No. WO91/09933 PCT Pub. Date Jul. 11, 1991.A metal wire having the following features: (a) it is formed, at least in part, by a steel having a carbon content of at least 0.1% and at most 0.6% and a boron content of less than 8 ppm; (b) the steel of the wire has a strain-hardened lower bainite type structure (7); (c) the diameter of the wire varies from 0.10 to 0.40 mm; (d) the resistance to rupture of the wire is at least equal to 2800 MPa; (e) the elongation upon rupture of the wire is at least equal to 0.4%. The method according to the invention for producing this wire consists in strain hardening a machine wire having 28% to 90% proeutectoid ferrite and 72% to 10% perlite, thereupon carrying out a heat treatment to obtain a structure of lower bainite type, then effecting a strain hardening on the wire, the temperature of the wire upon the strain hardening being less than 0.3 TF, TF being the melting point of the steel expressed in Kelvin. |
