Tubular element for a heat exchanger
US5351750A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1993 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Mar 24, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12764
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A tubular element for a heat-exchanger comprises a tubular core composed of a first aluminum alloy comprising up to 0.3 wt % maximum of silicon, up to 0.5 wt % maximum of iron, from 0.50 to 0.70 wt % of copper, from 0.65 to 1.0 wt % of manganese, from 0.1 to 0.30 wt % of magnesium, up to 0.05 wt % maximum of zinc, from 0.08 to 0.10 wt % of titanium, and the balance aluminum and unavoidable impurities; an inner layer of a second aluminum alloy on the tubular core; and an outer brazable layer of a third aluminum alloy on the tubular core. The tubular core and the inner layer may be selected to have a corrosion potential difference of from 170 to 200 mV verses a saturated calomel electrode. The tubular core may have a grain size falling within the range about ASTM 5 to about ASTM 6 and the grains having a morphology which is elongated in the axial direction of the tubular core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.