Steel wire having a structure of a strain-hardened lower bainite type and method for producing such wire
US5342700A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1992 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Jun 17, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12924
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A metal wire having the following features: PA1 (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; PA1 (b) the steel of the wire has a strain-hardened lower bainite type structure (7); PA1 (c) the diameter of the wire varies from 0.10 to 0.40 mm; PA1 (d) the resistance to rupture of the wire is at least equal to 2800 MPa; PA1 (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 T.sub.F, T.sub.F being the melting point of the steel expressed in Kelvin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.