Wire rods with superior drawability and manufacturing method therefor
US6264759A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Oct 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for manufacturing wire rods and steel wire for use in making bead wires, wire ropes and springs is disclosed. That is, high drawability wire rods and a manufacturing method therefor are disclosed, in which the wire drawing is possible without carrying out patenting (an intermediate heat treatment). The high drawability wire rods for making high strength steel wire includes a steel containing, in wt %, 0.4-0.65% of C, 0.1-1.0% of Si, 0.1-1.0% of Mn, 0.3% or less of Cr, 100 ppm or less of B, Fe and other unavoidable impurities. The steel further contains 0.02% or less of one or more elements selected from a group consisting of Ti, Nb and V. The steel has a degenerated pearlite structure with pro-eutectoid ferrite of 10% or less, the remaining part being a discontinuously formed cementite. A billet having the above composition is hot-rolled, and is cooled at a cooling rate of 10-30.degree. C./sec.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.