Title

INTERPRETATION OF UT AND EC RESULTS IN ROLL TESTING

INTERPRETATION OF UT AND EC RESULTS IN ROLL TESTING

Authorship

Brandner, Michael; Kollenburg, Ruud van

Brandner, Michael

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Kollenburg, Ruud van

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DOI

10.5151/2594-5297-0004

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Abstract

In recent years roll manufacturers have developed different kinds of high performance rolls. To achieve higher performance these rolls have complex alloy designs and higher hardness shell material. Due to the complex heat treatment necessary to achieve the full benefit of these alloys, residual stresses in the rolls have increased. To ensure a high safety level during operation, the monitoring of the transition zone of double-poured high performance rolls has become increasingly important. From the roll manufacturer’s point of view, only the roll-related factors can be influenced, and this is why excellent rolls may sometimes show unexpected results. The high number of campaigns sustained by each roll leads to a situation where fatigue becomes an increasingly significant factor. This paper describes the possibilities of a roll maker and the chances of the roll user to bring a roll through the expected lifetime.

In recent years roll manufacturers have developed different kinds of high performance rolls. To achieve higher performance these rolls have complex alloy designs and higher hardness shell material. Due to the complex heat treatment necessary to achieve the full benefit of these alloys, residual stresses in the rolls have increased. To ensure a high safety level during operation, the monitoring of the transition zone of double-poured high performance rolls has become increasingly important. From the roll manufacturer’s point of view, only the roll-related factors can be influenced, and this is why excellent rolls may sometimes show unexpected results. The high number of campaigns sustained by each roll leads to a situation where fatigue becomes an increasingly significant factor. This paper describes the possibilities of a roll maker and the chances of the roll user to bring a roll through the expected lifetime.

Keywords

UT testing; EC testing; Surface wave; Work roll.

UT testing; EC testing; Surface wave; Work roll.