Grade 550MPA high-temperature resistant pipeline steel and method of manufacturing same
US11085098B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2015 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Sep 18, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a Grade 550 MPa high temperature-resistant pipeline steel, the chemical elements, in mass percentage, being: 0.061%≤C≤0.120%, 1.70%≤Mn≤2.20%, 0.15%≤Mo≤0.39%, 0.15%≤Cu≤0.30%, 0.15%≤Ni≤0.50%, 0.035%≤Nb≤0.080%, 0.005%≤V≤0.054%, 0.005%≤Ti≤0.030%, 0.015%≤Al≤0.040%, 0.005%≤Ca≤0.035%, and the balance being Fe and unavoidable impurities. Also disclosed is a manufacturing method of the Grade 550 MPa high temperature-resistant pipeline steel, comprising the steps of: smelting, casting, slab heating, rough rolling, finish rolling, controlled cooling, and air cooling to room temperature. The pipeline steel has an excellent mechanical property under a high temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.