Softening method for high-strength Q and P steel hot roll
US11981972B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 20, 2018 |
| Grant date | May 14, 2024 |
| Priority date | — |
| Expiry date | Jul 2, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/0025
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is disclosed a softening method for a high-strength Q & P steel hot-rolled coil, comprising: after heating a Q & P steel ingot, subjecting it to rough rolling, finish rolling, laminar cooling and coiling to obtain a hot-rolled coil; after unloading the coil, covering the coil on-line with an insulating enclosure and moving it into a steel coil warehouse along with a transport chain; after a specified period of insulating time, removing the coil from the insulating enclosure, and cooling it to room temperature in air, wherein the coiling is performed at a temperature of 400-600° C.; said covering on-line with an insulating enclosure means each hot-rolled coil is individually covered with an independent, closed insulating enclosure unit within 60 minutes after unloading; the insulating time of the steel coil in the insulating enclosure is ≥60 minutes. The inventive method replaces the intermediate annealing step in the production process of cold-rolled Q & P steel. The inventive method has low cost and high efficiency, and it is not affected by the surrounding environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.