Method and apparatus for determining the thickness of a chromium depleted zone of a surface region of a steel member
US7449881B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2003 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Jan 16, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/208
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a method and apparatus for monitoring subsurface chromium depletion from a steel member, such as a pyrolysis pipe. In the harsh conditions of a pyrolysis furnace, chromium within the pipe 16 migrates towards the pipe surface which results in the formation of a chromium depleted layer 14. This layer can provide useful data about the condition and operation of the furnace. The degree of chromium depletion is measured by using a magnetic source of known strength to create a magnetic field in the surface region of the pipe 16. An estimate of the thickness of the chromium depleted layer 14 is determined from the resultant magnetic flux, which can be measured by a hall element arranged at substantially 45° to the longitudinal axis of the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.