Abstract
Thickness measurements by radiation are influenced by various factors: steel compositions, water film on the surface of steel strip, location of steel strip, temperature variation, and heat treatment. We have performed factory tests to determine the effects of the above factors.
Results are summarized as follows:
(1) The effect of the composition can be calculated theoretically, and the theoretical results agree with those obtained in the factory tests.
(2) The compensation for strip temperature variations varies in each mill. It can, however, be neglected in the range of ±50°C.
(3) Effects of steel density change due to the hot rolling could not be detected in these tests.
