Continuous hot rolled coil for high collapse-resistant sew petroleum casing and manufacturing method thereof
US11466333B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2018 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Aug 22, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention discloses a continuous hot rolled coil for a high collapse-resistant SEW petroleum casing and a manufacturing method thereof, and belongs to the technical field of hot continuous rolling production. Provided is a continuous hot rolled coil for a high collapse-resistant SEW petroleum casing with low alloy element cost and excellent initial welding property, and a manufacturing method thereof. The production cost of the hot continuous rolled coil is lowered by reducing expensive alloy elements such as Mo and V therein, and strictly controlling the content components of chemical elements such as Cr, Mn and Ti. According to the manufacturing method, a continuous cast slab is used as an initial billet and subjected to rough rolling by refined grains for 5-7 passes under the temperature-controlled heating condition to form an intermediate billet, and then the intermediate billet is subjected to finish rolling for at least 4 passes, then finally cooled and coiled to complete the production and processing of the continuous hot rolled coils, and achieve the purpose of controlling the initial yield strength and the initial tensile strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.