Method for performing temper rolling on steel strip and method for manufacturing high tensile-strength cold rolled steel sheet
US8322178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2007 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Jan 24, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B2267/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Temper rolling at a total elongation percentage of 0.1% or more is performed on a steel strip using a temper rolling mill in which at least one roll stand having high roughness work rolls, the center-line averaged roughness Ra of which being in the range of 3.0 to 10.0 μm, is provided, or at least one roll stand having bright rolls is further provided downstream of the above roll stand, and as a result, a predetermined elongation percentage, flatness, and center-line averaged roughness can be imparted even to a steel strip having a yield strength of 340 MPa or more at a rolling load approximately equivalent to that for a mild steel without using a large facility and complicated control. In particular, a high tensile-strength cold rolled steel sheet having an Ra of 0.5 to 3.0 μm and superior die galling resistance is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.