Method for providing strong wire
US4161415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1978 |
| Grant date | Jul 17, 1979 |
| Priority date | — |
| Expiry date | May 3, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/065
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for improving the strength characteristics of a wire composed of an austenitic metal alloy selected from the group consisting of stainless steel alloys of the AISI 200 and 300 series and non-stainless steel alloys containing iron, manganese, chromium, and carbon, said alloy having an Md temperature of no higher than about 100.degree. C. and an Ms temperature of no higher than about minus 100.degree. C., comprising the following steps: PA1 (a) deforming the wire at a strain of at least about 10 percent and at a temperature in the range of about Md minus 50.degree. C. to about Md plus 50.degree. C., said Md temperature being that of the alloy undergoing deformation, in such a manner that the wire has a martensite phase of no greater than about 10 percent by volume and an austenite phase of at least about 90 percent by volume and a yield strength in the range of about 130,000 psi to about 230,000 psi; PA1 (b) cooling the wire to a temperature no higher than about minus 75.degree. C.; and PA1 (c) drawing the cooled wire through a die under back-tension (i) wherein the back-tension on said wire just prior to the entry of the wire into the die is at least about 75,000 psi and (…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.