High-carbon steel wire superior in resistance to longitudinal cracking, steel product for the same, and process for production of the same
US6322641A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Mar 7, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD07B1/066
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed herein are a high-carbon steel wire having high strength and superior in resistance to longitudinal cracking, a steel for said high-carbons steel wire, and a process for producing said steel. The high-carbon steel wire is characterized in that the essential components are C (0.65-1.2 wt %), Si (0.1-2.0 wt %), Mn (0.2-2.0 wt %), and Fe, the main phase is pearlite, and the ferrite area ratio is less than 0.40 % in the surface layer up to a depth of 50 .mu.m from the surface. The high-carbon steel may further contain B (0.0003-0.0050 wt %), Ti (less than 0.030 wt %), and N (less than 0.0050 wt %), with the amount of B, Ti, and N satisfying the following equation EQU 0.03.ltoreq.B/(Ti/3.43-N).ltoreq.5.0 The resulting steel wire produced in the usual way contains ferrite in an amount less than 0.40 wt % in its surface layer. This low ferrite content is responsible for good resistance to longitudinal cracking because ferrite causes longitudinal cracking to start from it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.