| 摘要 |
PCT No. PCT/FR91/00446 Sec. 371 Date Feb. 5, 1992 Sec. 102(e) Date Feb. 5, 1992 PCT Filed Jun. 6, 1991 PCT Pub. No. WO91/19014 PCT Pub. Date Dec. 12, 1991.A process is disclosed for obtaining a high-strength, strain-hardened steel wire by drawing a rod wire, optionally with intermediate thermal treatment. The rod wire is produced from a steel that is devoid of proeutectoid cementoid, and which comprises 0.45-0.75% C, less than 0.010% each of S and P, and conventional proportions of Mn, Si, Ca, Mo, and Al. The wire-drawing operation is carried out in two distinct phases, separated from each other by a single brassing-patenting treatment. In the final wire-drawing step the level of cross-sectional reduction is greater than 97 per cent. The level of cross-sectional reduction is also exceptionally high during the first wire-drawing phase as a result of elimination of conventional intermediate patenting.
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