Method and apparatus for determining the thickness of a...

Details Method and apparatus for determining the thickness of a... Method and apparatus for determining the thickness of a...

2003-07-22

2008-11-11

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S235000

Reexamination Certificate

active

07449881

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 pipe16migrates towards the pipe surface which results in the formation of a chromium depleted layer14. 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 pipe16. An estimate of the thickness of the chromium depleted layer14is 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.

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Takashi et al., Study of chromium depletion by magnetic method in Ni-based alloys, Feb. 2004, Journal of Magnetism and Magnetic material, vol. 269, Issue 2, pp. 139-149.

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