Heat exchanger
US11427893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2019 |
| Grant date | Aug 30, 2022 |
| Priority date | — |
| Expiry date | Oct 22, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28D2021/0026
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A Co-based alloy heat exchanger comprises: in mass %, 0.08-0.25% C; 0.1% or less B; 10-30% Cr; 5% or less Fe and 30% or less Ni, the total amount of Fe and Ni being 30% or less; W and/or Mo, the total amount of W and Mo being 5-12%; Ti, Zr, Nb and Ta, the total amount of Ti, Zr, Nb and Ta being 0.5-2%; 0.5% or less Si; 0.5% or less Mn; 0.003-0.04% N; and the balance being Co and impurities. The impurities include 0.5% or less Al, and 0.04% or less O. The heat exchanger is a polycrystalline body of matrix crystal grains with an average size of 5-100 μm. In the matrix crystal grains, segregation cells with an average size of 0.13-2 μm are formed, wherein components constituting an MC type carbide comprising Ti, Zr, Nb and/or Ta are segregated in boundary regions of the segregation cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.